Piri Keşif Aracı

1

A study of the density functional methods on the photoabsorption of bodipy dyes

Dergi Makalesi

Kaynak :

DSpace Makaleler

Yayıncı :

Journal of Photochemistry and Photobiology A-Chemistry

Yazar(lar) :

Hatice Ünal , Deniz Günceler , Ersen Mete

Konu :

Bodipy, Photo-Absorption, Sensitizer, Solar Cell, Density Functional, Solvent

Yıl :

2014

Journal of Photochemistry and Photobiology A-Chemistry

Yayıncı Web Sitesi Özet Ek Bilgiler

Kaydet

Mete, Ersen (Balıkesir Author) Tunability of the photoabsorption and directional charge injection characteristics of Bodipy-based dye molecules with different carbonyl groups make them promising candidates for photovoltaic applications. In order to study the effect of screening in the Coulomb interaction on the electronic and optical properties of two Bodipy derivatives, we have used linear response time-dependent and exact exchange hybrid density functional approaches. The effect of linear and non-linear solvation models on the electrochemical properties of the dyes has also been discussed. TUBITAK, The Scientific and Technological Research Council of Turkey 110T394

Anahtar Kelimeler : Bodipy, Photo-Absorption, Sensitizer, Solar Cell, Density Functional, Solvent, article

ISSN: 1010-6030

2

Reordering of polystyrene gel due to multiple swelling in organic vapor - Fast transient fluorescence technique study

Dergi Makalesi

Kaynak :

DSpace Makaleler

Yayıncı :

Journal of Photochemistry and Photobiology A-Chemistry

Yazar(lar) :

Matem Erdoğan , Önder Pekcan

Konu :

Reordering, Swelling, Gel, Fast Transient Fluorescence

Yıl :

2006

Journal of Photochemistry and Photobiology A-Chemistry

Yayıncı Web Sitesi Özet Ek Bilgiler

Kaydet

Erdoğan, Matem (Balıkesir Author) Reordering of disc-shaped polystyrene (PS) gels due to multiple swelling, under organic vapor was studied by using Fast Transient Fluorescence (FTRF) technique. Disc-sbaped polystyrene gels were prepared by free radical copolymerization (FRC) of styrene (S) with ethylene glycol dimethacrylate (EGDM) as a crosslinker. Pyrene (P) was introduced as a fluorescence probe during polymerization. Swelling experiments were performed by using P doped PS gels under chloroform vapor. After each swelling step, gels were left to dry in an oven at 30 degrees C for consecutive reswelling experiments. Decay curves of P were measured and pyrene lifetimes, tau, were determined. It was observed that tau values decreased as swelling recycles were repeated. It was observed that after the fifth swelling step, two different regimes appeared in the swelling processes in PS gels. Swelling time constant, tau(c), and cooperative diffusion coefficients, D-c were determined by using Li-Tanaka equation for each swelling step in both regimes. It was observed that D-c values decreased up to tenth swelling step and then remained unchanged in both regimes.

Anahtar Kelimeler : Reordering, Swelling, Gel, Fast Transient Fluorescence, article

ISSN: 1010-6030

3

Determination of optimum extinction wavelength for paracetamol removal through energy efficient thin film reactor

Dergi Makalesi

Kaynak :

DSpace Makaleler

Yayıncı :

Journal of Photochemistry and Photobiology A: Chemistry

Yazar(lar) :

D.I. Çifçi , T. Tunçal , A. Pala , O. Uslu

Konu :

Energy optimization, Hole blocking, Intermediates, Paracetamol degradation, TiO2 thin film

Yıl :

2016

Journal of Photochemistry and Photobiology A: Chemistry

Yayıncı Web Sitesi Özet Ek Bilgiler

Kaydet

Paracetamol (PAM) mineralization through nano-composite thin film (TF) based photocatalytic system was investigated under variable operational conditions. The experiments were conducted using a non-stirred flow through coated tubular quartz reactor (TQR). Elimination of energy demand arising from stirring and aeration through the developed TF reactor configuration was also among the main research interests. Ag-doped Si-TiO2 TFs were grown on Si-decorated inner surface of the TQR using sol-gel dip coating technique. The fabricated TF was characterized by SEM-EDS, TEM, AFM, XPS and UVvis spectroscopy methods. TF-based PAM mineralization kinetics were observed for both UVvis and UV wavelengths using pure, Si-Ti and Ag-doped Si-TiO2 TF(s). The direct and indirect optical ban gap energies (BGE) for the Ag doped Si-TiO2 TF were estimated to be 2.56 eV and 2.86 eV respectively. While no visible light activity was observed for pure TiO2 TF, Ag-doped Si-TiO2 TF exhibited significant PAM degradation activity for ? > 400 nm with a kobs value of 2.1 ± 0.1 10-3 min-1. In addition to known phenolic and carboxylated intermediates, UVvis spectroscopy, HPLC-MS and UPLC-MS/MS measurements indicated ?-cyano-4-hydroxicinnamic acid (?PHC) formation as a result of photo-addition reactions under UV C irradiation. Experimental results also indicated that ?PHC blocks h+/e- formation completely. Paracetamol could be degraded economically under UV B irradiation through the fabricated TF reactor without stirring, aeration or adding external electron acceptors. © 2016 Elsevier B.V. All rights reserved. 111Y209 This work is partially funded by The Scientific and Technological Research Council of Turkey TÜBİTAK (Project 111Y209). The authors express their gratitude to Food Antioxidants Measurement & Application Center for the support given to the projects.

Anahtar Kelimeler : Energy optimization, Hole blocking, Intermediates, Paracetamol degradation, TiO2 thin film, article

ISSN: 10106030

4

Synthesis of tetra-substituted phthalocyanines bearing 2-(ethyl(m-tolyl) amino)ethanol: Computational and photophysicochemical studies

Dergi Makalesi

Kaynak :

DSpace Makaleler

Yayıncı :

10.1016/j.jphotochem.2018.12.038 JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY Makale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı

Yazar(lar) :

Armagan Gunsel , Ahmet T. Bilgicli , Burak Tuzun , Hasan Piskin , Goknur Yasa Atmaca , Ali Erdogmus , M. Nilufer Yarasir

Konu :

Phthalocyanine, Synthesis, Computational studies, Crystal structure, Photochemistry

Yıl :

2019

10.1016/j.jphotochem.2018.12.038 JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY Makale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı

Yayıncı Web Sitesi Özet Ek Bilgiler

Kaydet

This work presents the synthesis of 4-(2-(ethyl(m-tolyl) amino) ethoxy) phthalonitrile (1) as ligand and its peripherally tetrasubstituted metal-free (2) and metallophthalocyanines (3-5) derivatives. Synthesized compounds were characterized by standart spectroscopy methods. The molecular structure of the ligand (1) was confirmed by single-crystal X-ray diffraction experiment. The crystallographic information file (cif) was uploaded to the data center with CCDC number 1,853,485. The optimized structure of the ligand (1) and the phthalocyanines (2-5) were obtained by using different metods such as B3lyp, HF and m062x method 3-21 g, 6-31 g, sdd basis set. In b3lyp/6-31 + + g(d,p) basis set, H-1 and C-13 NMR chemical shifts, IR spectrum and UV-vis spectrum were measured in gas, chloroform and dimethylsulfoxide phase by means of the obtained optimized structure. Besides, the photophysical and photochemical properties of newly synthesized phthalocyanines (2-5) were investigated in DMSO, comparatively. Singlet oxygen quantum yields of the phthalocyanines (2-5) are ranging from 0.28 to 0.70. Sakarya University [BAP-2017-02-04-013] We thank The Research Fund of Sakarya University (Project no: BAP-2017-02-04-013). This research was made possible by TUBITAK ULAKBIM, High Performance and Grid Computing Center (TR-Grid e-Infrastructure).

Anahtar Kelimeler : Phthalocyanine, Synthesis, Computational studies, Crystal structure, Photochemistry, article

ISSN: 1010-6030

Sınıflandırma :

Kimya %100

Kimyada Bilgisayar Uygulamaları %79

5

Bare, gold and silver nanoparticle decorated, monodisperse-porous titania microbeads for photocatalytic dye degradation in a newly constructed microfluidic, photocatalytic packed-bed reactor

Dergi Makalesi

Kaynak :

DSpace Makaleler

Yayıncı :

10.1016/j.jphotochem.2016.08.015 JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY Makale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı

Yazar(lar) :

Kadriye Ozlem Hamaloglu , Ebru Sag , Ali Tuncel

Konu :

Titania microbeads, Gold decorated titania microbeads, Silver decorated titania microbeads, Photocatalysis, Continuous photocatalytic dye degradation, Remazol Black 5

Yıl :

2017

10.1016/j.jphotochem.2016.08.015 JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY Makale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı

Yayıncı Web Sitesi Özet Ek Bilgiler

Kaydet

Monodisperse porous titania microbeads were synthesized by a sol-gel templating protocol. Gold nanoparticles (AuNPs) synthesized by Turkevich and Martin methods 16 and 5 nm in size, respectively and silver nanoparticles (AgNPs) 12 nm in size were decorated onto the primary amine attached titania microbeads. Both size and porous properties of bare or AuNP/AgNP decorated monodisperse-porous titania microbeads were suitable for using them as a photocatalyst in a Microfluidic, Photocatalytic Packed Bed Reactor (MPPBR) with reasonable pressure drops in the microflow rate range. Then, a MPPBR system for continuous photocatalytic dye degradation was first constructed by slurry packing of bare or AuNP/AgNP decorated titania microbeads into a fused silica capillary 320 mu m in diameter. The photocatalytic activities of bare and AuNP/AgNP decorated titania microbeads were determined in MPPBR using a textile dye, Remazol Black 5 (RB5). The complete removal of RB5 was achieved in continuous mode and an appreciable enhancement in the photoremoval rate of RB5 was observed with the MPPBR containing Martin AuNP decorated titania microbeads. The system constructed can be evaluated as a promising tool for both pre-column and post-column applications involving the removal of coloured contaminants in the assays conducted in micro-liquid chromatography systems. (C) 2016 Elsevier B.V. All rights reserved.

Anahtar Kelimeler : Titania microbeads, Gold decorated titania microbeads, Silver decorated titania microbeads, Photocatalysis, Continuous photocatalytic dye degradation, Remazol Black 5, article

ISSN: 1010-6030

Sınıflandırma :

Kimya %93

Nanokimya %90

6

Photoinduced optical anisotropy in films of photochromic liquid crystalline polymers

Araştırma Makalesi

Kaynak :

Science Direct

Yayıncı :

Journal of Photochemistry and Photobiology A: Chemistry

Yazar(lar) :

Th. Fischer , L. Läsker , J. Stumpe , S.G. Kostromin

Yıl :

1994

Journal of Photochemistry and Photobiology A: Chemistry

Yayıncı Web Sitesi Tam Metin Özet Ek Bilgiler

Kaydet

The light-induced modification of the optical properties of photochromic liquid crystalline (side-group) polymers (LCPs) containing azobenzene moieties was studied. Films of such polymers were irradiated with unpolarized and linearly polarized light. Unpolarized irradiation results in a modification of the order parameter, whereas the director orientation remains constant. The light-induced disturbance of the supramolecular order is strongly dependent on the structure of the polymer. A correlation with the enthalpic stability of the liquid crystalline phases is given. Linearly polarized irradiation causes a modification of the order parameter and a reorientation of the side-groups towards a direction perpendicular to the electric vector of the actinic light. This reorientation process is caused by an angular-dependent photoselection within the steady state of the photoisomerization of the azobenzene units. The amount and kinetic of the reorientation differ considerably as a function of certain structural features of the polymers, such as the content of photochromic moieties and the lengths of the spacer chains between the polymeric backbone and the rod-like moieties. It is shown that under certain circumstances the angular-dependent photoselection process may cause a reorientation of the non-photochromic moieties by a cooperative process. The result is a light-induced rotation of the optical axis of the LCP and thus an efficient modification of the birefringent and dichroic properties. This effect can be used in optical data storage.

DOI : 10.1016/1010-6030(94)01056-0

Cilt: 80
Sayı: 1-3
Sayfa: 453-459
ISSN: 1010-6030

Sınıflandırma :

Kimya %62

Yoğun Madde Fiziği %21

Fizik %32

Spektroskopi ve Spektrometri %53

Optik Cihazlar %28

7

Isolation and identification of photoproducts from UVA-irradiated mixture of N-nitrosoproline with 2'-deoxyadenosine

Araştırma Makalesi

Kaynak :

Science Direct

Yayıncı :

Journal of Photochemistry and Photobiology A: Chemistry

Yazar(lar) :

Shuhei Aoyama , Chiharu Asahi , Kayoko Sano , Sachiko Kimura , Toshinori Suzuki , Tsutomu Hatano , Sakae Arimoto-Kobayashi

Yıl :

2019

Journal of Photochemistry and Photobiology A: Chemistry

Yayıncı Web Sitesi Tam Metin Özet Ek Bilgiler

Kaydet

N-Nitrosoproline (NPRO) is known to form endogenously from sodium nitrite and the amino acid proline, and is thought to be non-mutagenic and non-carcinogenic. However, earlier studies in our laboratory showed that irradiated NPRO can be converted directly to a mutagenic compound upon UVA irradiation. We previously investigated the mutagenic spectrum of NPRO on M13mp2 DNA with UVA irradiation, and found a hot spot comprising AT to GC, where there might be a particular photoreaction of adenine residues with NPRO. In the present study, we investigated the reaction of NPRO with 2-deoxyadenosine (dA) under UVA irradiation, and identified the chemical structures of the photoproducts. Photoproducts from NPRO and dA were isolated and analyzed with HPLC, MS and NMR. (R)-, (S)-2-(2-pyrrolidyl)-2’-deoxyadenosine (P1, P2) and deoxyinosine (dI) were identified from the mixture of dA and NPRO irradiated with UVA. Results suggest that UVA-activated NPRO produces pyrrolidyl cations which react with dA to generate pyrrolidyl-dA adducts. Production of P1 and P2 from irradiated NPRO with dA increased under N2 saturation compared to those under air saturation, while production of P1 and P2 from irradiated solution under O2 saturation was lower compared to that under air. These results suggest that a Type-I mechanism is involved in the photoproduction of P1 and P2. Furthermore, reactive oxygen species generated during photo-reaction in the presence of O2 may act to destroy the activated form of irradiated NPRO to reduce the formation of P1 and P2. The formation of dI in the irradiated mixture of NPRO with dA might mediate NO release from irradiated NPRO.

DOI : 10.1016/j.jphotochem.2019.03.016

Anahtar Kelimeler : photoreaction, N-nitrosoproline, adenosine adducts, deoxyinosine, reactive oxygen species

Cilt: 377
Sayı: 0
Sayfa: 159-166
ISSN: 1010-6030

Sınıflandırma :

Kimya %100

8

Photosensitizing properties of formulation adjuvants

Araştırma Makalesi

Kaynak :

Science Direct

Yayıncı :

Journal of Photochemistry and Photobiology A: Chemistry

Yazar(lar) :

M.A. Malouki , L. Cavani , A. ter Halle , C. Ciavatta , C. Richard

Yıl :

2009

Journal of Photochemistry and Photobiology A: Chemistry

Yayıncı Web Sitesi Tam Metin Özet Ek Bilgiler

Kaydet

Protein hydrolysed fertilizers (PHFs) are currently used to stimulate plant metabolism, mainly through foliar application, and are proposed for use as pesticide adjuvants. However, the effects of PHFs on pesticides upon irradiation are unknown. Here, several herbicides and model compounds were irradiated with simulated solar light in the presence of four PHFs extracted from animal proteins and from vegetal. PHFs enhanced the photodegradation of fenuron, mesotrione, 2-mercaptobenzothiazole and 2,4,6-trimethylphenol. Using the scavenging technique, we could evidence the direct reaction of triplet excited states of PHFs towards substrates and we evaluated the contribution of triplets, singlet oxygen and hydroxyl radicals. Hydroxyl radicals were not detected; they were either not formed or were efficiently scavenged by the PHFs. The four PHFs showed distinct photosensitizing abilities. Production processes, rather than origin of the PHFs, seem to govern the photochemical reactivity of the PHFs.

DOI : 10.1016/j.jphotochem.2009.01.018

Anahtar Kelimeler : Photodegradation, Pesticides, Formulant, Reactive species

Cilt: 203
Sayı: 2-3
Sayfa: 186-191
ISSN: 1010-6030

Sınıflandırma :

Kimya %66

Biyoteknoloji %44

Çevre %25

Su kirliliği %40

Çevre Kimyası %30

9

Removal of polycyclic aromatic hydrocarbons (PAHs) from groundwater by heterogeneous photocatalysis under natural sunlight

Araştırma Makalesi

Kaynak :

Science Direct

Yayıncı :

Journal of Photochemistry and Photobiology A: Chemistry

Yazar(lar) :

Nuria Vela , Marina Martínez-Menchón , Ginés Navarro , Gabriel Pérez-Lucas , Simón Navarro

Yıl :

2012

Journal of Photochemistry and Photobiology A: Chemistry

Yayıncı Web Sitesi Tam Metin Özet Ek Bilgiler

Kaydet

Polycyclic aromatic hydrocarbons (PAHs) are a class of persistent organic pollutants of special concern because they are carcinogenic and mutagenic compounds. In this paper, photodegradation of a mixture of six PAHs in groundwater at pilot plant scale is reported. Semiconductor materials (ZnO and TiO2) as photocatalysts in tandem with Na2S2O8 as oxidant under natural sunlight were used. The PAHs were benzo[a]pyrene, benzo[b]fluoranthene, benzo[ghi]perylene, benzo[k]fluoranthene, fluoranthene, and indene[1,2,3-cd]pyrene. As expected, the influence of both semiconductors on the degradation of PAHs was very significant in all cases. Photocatalytic experiments show that the addition of photocatalyst, especially for ZnO/Na2S2O8 system, strongly improves the elimination of PAHs in comparison with photolytic tests; significantly increasing the reaction rates. The first-order equation (monophasic model) satisfactorily explained the disappearance process although it ignores small residues remaining late in the process. These residues are important from an environmental point of view and the Hoerl function (biphasic model) better predict the results obtained. In our conditions, the time required for 90% degradation was in the range 7–15 min and 18–76 min for ZnO and TiO2 systems, respectively. Thus, the use of the tandem ZnO/Na2S2O8 makes possible the economical decontamination of groundwater containing non-biodegradable pollutants like PAHs.

DOI : 10.1016/j.jphotochem.2012.02.003

Anahtar Kelimeler : Groundwater, Photodegradation, Polycyclic aromatic hydrocarbons, Titanium dioxide, Zinc oxide

Cilt: 232
Sayı: 0
Sayfa: 32-40
ISSN: 1010-6030

Sınıflandırma :

Çevre %100

Çevre Kimyası %59

10

A pyrene-containing Schiff base fluorescent ratiometric probe for the detection of Cu2+ in aqueous solutions and in cells

Araştırma Makalesi

Kaynak :

Science Direct

Yayıncı :

Journal of Photochemistry and Photobiology A: Chemistry

Yazar(lar) :

Li-Jun Ma , Qingjian Liang , Ruihong Feng , Zu Lv , Fengchao Cui , Ligui Li , Liting Yang , Hong Liu , Fengqiang Sun

Yıl :

2021

Journal of Photochemistry and Photobiology A: Chemistry

Yayıncı Web Sitesi Tam Metin Özet Ek Bilgiler

Kaydet

A highly selective and sensitive fluorescent ratiometric probe (1) based on pyrene-containing Schiff base for the dection of Cu2+ was synthesized. In acetonitrile–HEPES buffer solution (20.0 mM HEPES, 8:2, v/v, pH 7.4), only Cu2+, out of tested common cations, could induce the aggregation of probe 1. Fluorescence analysis showed that the excimer emission band of pyrene groups of probe 1 appeared and gradually increased with the addition of Cu2+. The fluorescent intensity ratio of excimer and monomer (I470/I409) of probe 1 increased 27.8-fold upon the addition of one equiv. of Cu2+ with a detection limit of 20.2 nM (1.28 ppb). The addition of Cu2+ also induced obvious color change and the characteristic peaks of pyrene excimer in UV–vis spectrometra of the relutant solution. Results from the Job plot, metal-binding fluorescent titration, mass spectra experiments and density functional theory calculations indicated a binding ratio of 2:1 (probe 1: Cu2+). In addition, probe 1 showed good potential as a fluorescent visualizing probe for the detection of Cu2+ in living GS cells of epinepheluscoioides.

DOI : 10.1016/j.jphotochem.2020.113086

Anahtar Kelimeler : Fluorescent probe, Ratiometric, Pyrene, Schiff base, Cu2+

Cilt: 408
Sayı: 0
Sayfa: 113086-0
ISSN: 1010-6030

11

Optimization of the artificial neuronal network for the degradation and mineralization of amoxicillin photoinduced by the complex ferrioxalate with a gradual and progressive approach of the ligand

Araştırma Makalesi

Kaynak :

Science Direct

Yayıncı :

Journal of Photochemistry and Photobiology A: Chemistry

Yazar(lar) :

Imene Kahina Benramdane , Noureddine Nasrallah , Abdeltif Amrane , Mohammed Kebir , Mohamed Trari , Florence Fourcade , Aymen Amine Assadi , Rachida Maachi

Yıl :

2021

Journal of Photochemistry and Photobiology A: Chemistry

Yayıncı Web Sitesi Tam Metin Özet Ek Bilgiler

Kaydet

In this work, the Ferrioxalate complex was used to mineralize the widely used antibiotic amoxicillin (AMX). The effect of operational parameters such as Fe3+ concentration, the molar ratio (Oxalate/Fe3+), and initial pH was studied for achieving high efficiency of degradation and mineralization. The effect of inorganic ions in the degradation of AMX was also investigated. Optimization of an Artificial Neural Network (ANN) to predict the performance of the process was realized. Neural networks were applied to model AMX degradation using 75 experimental data. Analysis of the results shows that the oxalate: iron ratio is limited to 3 with a Fe3+ concentration of 0.35 mM. In order to avoid this limitation, an alternative solution was adopted to increase the molar ratio with the gradual and progressive use of oxalic acid ligand. Almost total degradation and mineralization of AMX was achieved at the free initial pH of 2.8 and final pH of 6. The study of the effect of inorganic ions showed that bicarbonate and sulfate ions play an important role in contrast to Cl− ions with no noticeable influence. Neural network application resulted in a MSE of 1.1543 × 10-5 and a correlation coefficient r of 0.99 for AMX degradation and MSE of 1.12162 × 10-5 with r of 0.99 for mineralization. The model can describe successfully the percentage of degradation and mineralization of AMX under various conditions. ANN and NSGA-II (Non-dominant Sorting Genetic Algorithm -II) hybrid method to solve a multi-objective problem was proposed to determine the optimal (Fe3+/Ox/UVA) operating and process parameters.

DOI : 10.1016/j.jphotochem.2020.112982

Anahtar Kelimeler : Complex, Degradation, Mineralization, Artificial neural network, Injection method, Genetic algorithm

Cilt: 406
Sayı: 0
Sayfa: 112982-0
ISSN: 1010-6030

12

ESIPT triggered swift determination of cysteine in HeLa cell line during redox imbalance

Araştırma Makalesi

Kaynak :

Science Direct

Yayıncı :

Journal of Photochemistry and Photobiology A: Chemistry

Yazar(lar) :

Kathiresan Anusuyadevi , Shu Pao Wu , Sivan Velmathi

Yıl :

2020

Journal of Photochemistry and Photobiology A: Chemistry

Yayıncı Web Sitesi Tam Metin Özet Ek Bilgiler

Kaydet

Detection of cysteine is crucial as its deviation from normal concentration leads to various diseases. In this work, benzothiazole based chemodosimeter was synthesized to discriminate cysteine rapidly in the presence of other competing interferences. The probe exhibit ESIPT governed colorimetric and fluoremetric response on addition of cysteine via conjugate addition-cyclization reaction and it is confirmed by NMR and HRMS. The probe can detect lower concentration of cysteine with limit of detection 0.07 μM in 2 min that assist the system to work well in biological systems. Hence the sensor was profitably employed in imaging of cysteine in HeLa cell line and variance in the redox state was also investigated.

DOI : 10.1016/j.jphotochem.2020.112875

Anahtar Kelimeler : ESIPT, Swift response, Biothiols, Discrimination, Redox imbalance

Cilt: 403
Sayı: 0
Sayfa: 112875-0
ISSN: 1010-6030

13

Heat-transfer ('iron-on') photocatalytic films

Araştırma Makalesi

Kaynak :

Science Direct

Yayıncı :

Journal of Photochemistry and Photobiology A: Chemistry

Yazar(lar) :

Aaron McNeill , Ri Han , Andrew Mills

Yıl :

2020

Journal of Photochemistry and Photobiology A: Chemistry

Yayıncı Web Sitesi Tam Metin Özet Ek Bilgiler

Kaydet

The simple preparation of nanoparticulate CdS and TiO2 photocatalytic (PC) films embedded in a thin (2.5 μm) layer of polystyrene (PS), i.e. PC-PS films, is described. These CdS-PS, or TiO2-PS, films are then readily and easily transferred onto a range of different common flexible materials, such as many different plastics and fabrics, using the heat from an iron. In all cases the heat-transferred PC-PS films appear physically robust, as demonstrated by the 3 M Scotch Tape test, and, for the same PC, exhibit a similar photocatalytic activity, regardless of the material it is ironed onto. The photocatalytic activities of these iron-on films are demonstrated using cotton as the material support. Thus, the CdS-PS-Cot film is used to photoreduce methyl orange, methyl viologen and water using visible light (415 nm) and a sacrificial electron donor (ascorbate or EDTA). The TiO2-PS-Cot film is used to effect the same reduction reactions, but with UVA light (365 nm). The TiO2-PS-Cot film is also able to photocatalyse the oxidation of methylene blue and NO by air. In most cases there is little or no loss of activity with repeated use. Encouragingly, the non-optimised TiO2-PS-Cot film appears more active than the commercial flexible polymeric photocatalytic film Purify Mesh 30 (Taiyo Europe GmbH).

DOI : 10.1016/j.jphotochem.2020.112576

Anahtar Kelimeler : Titanium dioxide, Cadmium sulfide, Colloidal, Polystyrene, Cotton, Iron-On

Cilt: 398
Sayı: 0
Sayfa: 112576-0
ISSN: 1010-6030

14

Editorial Board

Dergi Makalesi Open Access

Kaynak :

Science Direct

Yayıncı :

Journal of Photochemistry and Photobiology A: Chemistry

Yıl :

2020

Journal of Photochemistry and Photobiology A: Chemistry

Yayıncı Web Sitesi Tam Metin Ek Bilgiler

Kaydet

DOI : 10.1016/S1010-6030(20)30431-7

Cilt: 397
Sayı: 0
Sayfa: 112632-0
ISSN: 1010-6030

15

Modulation of Fluorescence properties of 5-Aminoquinoline by Ag+ in aqueous media via charge transfer

Araştırma Makalesi

Kaynak :

Science Direct

Yayıncı :

Journal of Photochemistry and Photobiology A: Chemistry

Yazar(lar) :

Nupur Pandey , Mohan Singh Mehata , Nisha Fatma , Sanjay Pant

Yıl :

2020

Journal of Photochemistry and Photobiology A: Chemistry

Yayıncı Web Sitesi Tam Metin Özet Ek Bilgiler

Kaydet

The effect of silver ions ( Ag+) on the photophysical behavior of 5-aminoquinoline (5AQ) has been studied in an aqueous environment using steady-state and time-resolved spectroscopic techniques. 5-AQ exhibits two weak fluorescence (FL) bands in an aqueous medium. The successive addition of Ag+ ions to the aqueous solution of 5AQ amplify the FL intensity of the large Stokes shifted band upto 21 folds accompanied by a red-shift as a result of the acceleration of charge transfer (CT) process and restriction of hydrogen bonding in the excited state. 5AQ exhibits good selectivity for Ag+ ion over other metal ions (Li+, K+, Pb2+, Zn2+, Fe2+, Mn2+, Mg2+, Cu2+, Cd2+, Co2+, Cr3+, Ni2+). The Benesi-Hildebrand and Hills equations together with DFT calculations demonstrated the formation of 1:1 complex between 5AQ and Ag+. Furthermore, 5AQ can perform as an INHIBIT logic gate triggered by Ag+ and H+ ions. Hence, the proposed study appears to be interesting in the detection of Ag+ ions in aqueous media to a certain extent, indicating that 5AQ would have potential applications in the environmental and biological monitoring of Ag+ ions. Additionally, practical application carried out indicates that 5AQ can be used for the recognition of Ag+ ions in drinking water samples.

DOI : 10.1016/j.jphotochem.2020.112549

Anahtar Kelimeler : Aminoquinoline derivative, Ag+ions, Fluorescence enhancement, Charge transfer, Fluorescence restoration, aqueous medium, Logic gate

Cilt: 396
Sayı: 0
Sayfa: 112549-0
ISSN: 1010-6030

16

An AIEE active 1, 8-naphthalimide- sulfamethizole probe for ratiometric ﬂuorescent detection of Hg2+ ions in aqueous media

Araştırma Makalesi

Kaynak :

Science Direct

Yayıncı :

Journal of Photochemistry and Photobiology A: Chemistry

Yazar(lar) :

Bahta Muzey , Ahmed Naseem

Yıl :

2020

Journal of Photochemistry and Photobiology A: Chemistry

Yayıncı Web Sitesi Tam Metin Özet Ek Bilgiler

Kaydet

1,8-Naphthalimide-based sulfamethizole molecule (L6) has been designed and synthesized which have properties like AIEE active, and ratiometric fluorescence sensing of Hg2+ and Ag+ ions. The hydrophobic nature of naphthalimide fluorogenic moiety instigates the aggregation induced emission (AIE) in aqueous medium, led to excimer emission upon intramolecular excimer formation via metal ion-induced assembly. The high selectivity of the sensor was due to quenching of the monomeric emission of L6 at 390 nm with red shift to gradual enhancement in new peak at 483 nm and 478 nm for Hg2+ and Ag+ ions respectively, which is responsible for the ratiometric detection. The competitive experiments revealed that the chemosensor is selective to Hg2+ over Ag+ ion and selective and sensitive ratiometric response to Hg2+ ion without interference of any other metal ions. A limit of detection of Hg2+ ion was found 14.7 nM in 99 % aqueous solution. Also, the visual fluorescence color change of L6 from blue to green was observed under uv-lamp upon addition of Hg2+ ion to L6 solution.

DOI : 10.1016/j.jphotochem.2020.112354

Anahtar Kelimeler : 1, 8-naphthalimide based sulfamethizole ligand, AIEE, Monomer-Excimer, Ligand-Metal complex, Ratiometric sensing

Cilt: 391
Sayı: 0
Sayfa: 112354-0
ISSN: 1010-6030

17

Construction of H-TiO2/BiOCl heterojunction with improved photocatalytic activity under the visible and near-infrared light

Araştırma Makalesi

Kaynak :

Science Direct

Yayıncı :

Journal of Photochemistry and Photobiology A: Chemistry

Yazar(lar) :

Hongjun Dong , Mengya Xiao , Jiaming Li , Wei Hu , Xiang Sun , Yichun Liu , Pingfan Zhang , Guangbo Che , Chunbo Liu

Yıl :

2020

Journal of Photochemistry and Photobiology A: Chemistry

Yayıncı Web Sitesi Tam Metin Özet Ek Bilgiler

Kaydet

It still is difficult issue to exploit the efficient photocatalysts that can response broad solar spectrum from visible to near-infrared (NIR) region. Herein, the H-TiO2/BiOCl heterojunctions are constructed firstly by a facile solvothermal method. The transfer and separation efficiency of charge carriers are improved distinctly owing to the modification effects of H-TiO2 nanoparticles on the surface of BiOCl flower spheres. Compared to BiOCl and H-TiO2, H-TiO2/BiOCl heterojunctions remarkably exhibit the enhanced photocatalytic activity for degrading tetracycline hydrochloride (TC-HCl) and methyl orange (MO) dye under the visible and NIR light, respectively. Moreover, we discuss the effect of H-TiO2/BiOCl heterojunction on the physical and photoelectrochemical properties, as well as the possible produced intermediates and degradation mechanism of TC-HCl in detail.

DOI : 10.1016/j.jphotochem.2020.112369

Anahtar Kelimeler : H-TiO2/BiOCl, Photocatalytic degradation, TC-HCl, MO, Visible and NIR light

Cilt: 392
Sayı: 0
Sayfa: 112369-0
ISSN: 1010-6030

18

Benzodimidazo2,1-bthiazole-based fluorescent sensor for Zn2+ ion detection

Araştırma Makalesi

Kaynak :

Science Direct

Yayıncı :

Journal of Photochemistry and Photobiology A: Chemistry

Yazar(lar) :

Seyed Ershad Moradi , Sajjad Molavipordanjani , Seyed Jalal Hosseinimehr , Saeed Emami

Yıl :

2020

Journal of Photochemistry and Photobiology A: Chemistry

Yayıncı Web Sitesi Tam Metin Özet Ek Bilgiler

Kaydet

In this study, we have synthesized and evaluated three benzo[d]imidazo[2,1-b]thiazole-based sensors (BIT-1, BIT-2 and BIT-3). Among them, BIT-3 namely 2-(benzo[d]imidazo[2,1-b]thiazol-2-yl)-5-methoxyphenol was introduced as a selective fluorescence chemosensor for Zn2+ ion detection. The presence of zinc ions enhanced fluorescence property of BIT-3 at 404 nm due to formation of a 1:1 complex between the chemosensor and the Zn2+ ion. Control experiments showed that the analogous ions do not have fluorescence enhancement effect and some of them even quench the fluorescence dramatically. The data obtained from UV–vis absorption analysis, fluorescence measurements and 1H NMR spectroscopy approved the interaction between BIT-3 and Zn2+ ion. The sensor probe BIT-3 exhibits a selective fluorescence enhancing property via a chelation-enhanced fluorescence (CHEF) upon addition of Zn2+. Thus, a selective fluorescent chemosensor BIT-3 establishes an important sensing platform for real-time monitoring of Zn2+ ion in aqueous environment.

DOI : 10.1016/j.jphotochem.2019.112184

Anahtar Kelimeler : Benzodimidazo2, 1-bthiazole, Zinc ions, Fluorescent probe, Chemosensor, CHEF

Cilt: 389
Sayı: 0
Sayfa: 112184-0
ISSN: 1010-6030

19

Nitrogen doped fluorescent carbon quantum dots for on-off-on detection of Hg2+ and glutathione in aqueous medium: Live cell imaging and IMPLICATION logic gate operation

Araştırma Makalesi

Kaynak :

Science Direct

Yayıncı :

Journal of Photochemistry and Photobiology A: Chemistry

Yazar(lar) :

Vikas Kumar Singh , Virendra Singh , Pradeep Kumar Yadav , Subhash Chandra , Daraksha Bano , Biplob Koch , Mahe Talat , Syed Hadi Hasan

Yıl :

2019

Journal of Photochemistry and Photobiology A: Chemistry

Yayıncı Web Sitesi Tam Metin Özet Ek Bilgiler

Kaydet

The present work describes the synthesis of N-CQDs via one step hydrothermal methods. The synthesized N-CQDs was fully characterized by TEM, P-XRD, FT-IR, XPS and Zeta sizer. It exhibited excitation independent emission behaviour with fluorescent quantum yield of 41% respect to quinine sulphate standard. The excellent optical properties of N-CQDs made it fluorescent probe for turn off detection of toxic heavy metal ion Hg2+ with good selectivity and sensitivity. The limit of detection was found to be 0.08 μM with correlation coefficient (R2 = 0.992). After addition of various reducing agent such as amino acid, EDTA and GSH in the quenched solution of N-CQDs + Hg2+, the fluorescence property was selectively recovered in the presence of GSH and hence the quenched solution further acts as selective turn on sensing of GSH up to lower limit of 2.0 μM with correlation coefficient (R2 = 0.996). The on-off-on sensing behaviour of N-CQDs was utilized for the implication of logic gate in absence and presence of Hg2+ and GSH to construct the molecular switches. The MTT assay of N-CQDs was performed on MCF-7 cancer cell line to check their applicability in biological system and the result showed negligible cytotoxicity and good permeability. The cell imaging on MCF-7 cells visualized in dichromic region (blue and green). Therefore, it could be smart material for sensing of heavy toxic metal as well as cell imaging application.

DOI : 10.1016/j.jphotochem.2019.112042

Anahtar Kelimeler : Fluorescent N-CQDs, Sensing, Glutathione, MTT assay, MCF-7 cell line

Cilt: 384
Sayı: 0
Sayfa: 112042-0
ISSN: 1010-6030

20

Hybrid organic and inorganic solar cell based on a cyanine dye and quantum dots

Araştırma Makalesi

Kaynak :

Science Direct

Yayıncı :

Journal of Photochemistry and Photobiology A: Chemistry

Yazar(lar) :

Mostafa F. Abdelbar , Tarek A. Fayed , Talaat M. Meaz , Thiyagu Subramani , Naoki Fukata , El- Zeiny M. Ebeid

Yıl :

2019

Journal of Photochemistry and Photobiology A: Chemistry

Yayıncı Web Sitesi Tam Metin Özet Ek Bilgiler

Kaydet

The combination of organic dyes with quantum dots (QDs) in solar cells can lead to more improvement in photovoltaic performance for such types of solar cells. Due to the quantum confinement, the photoluminescence (PL) of QDs can be tuned to match the absorption spectra of applied organic dyes. Herein, we introduce a new hybrid solar cell based on monomethine cyanine dye co-sensitized by CdS and CdTe/CdS core shell. The cyanine dye tends to aggregate on the surface of colloidal QDs due to electrostatic attraction followed by energy and electron transfer from QDs to cyanine dye. Electrophoretic deposition method was carried out to assist the cyanine dye loading on the surface of TiO2 thin film and the highest power conversion efficiency was 0.89% in case of cyanine dye co-sensitized by CdTe/CdS with open circuit voltage of 0.78 V and a photocurrent of 1.80 mA/ cm2.

DOI : 10.1016/j.jphotochem.2019.01.023

Anahtar Kelimeler : Aqueous quantum dots, Monomethine cyanine dyes, Quenching, Energy transfer, Co-sensitization, Hybrid solar cells

Cilt: 375
Sayı: 0
Sayfa: 166-174
ISSN: 1010-6030

21

2-Nitrodiphenylalkanes/alkenes as adept photosynthons for direct access to valuable N-heterocycles

Araştırma Makalesi

Kaynak :

Science Direct

Yayıncı :

Journal of Photochemistry and Photobiology A: Chemistry

Yazar(lar) :

Thomas Mathew , Kavita Belligund , Laxman Gurung , G.K. Surya Prakash

Yıl :

2019

Journal of Photochemistry and Photobiology A: Chemistry

Yayıncı Web Sitesi Tam Metin Özet Ek Bilgiler

Kaydet

Photoexcited o-nitro chromophore in o-nitrobenzylic systems has led to the design and development of many useful photochromic systems such as photolabile protecting groups, photoresists, for controlled release of bioactive compounds, as well as efficient photosynthons giving direct access to many important molecular systems that are otherwise difficult to obtain. This brief review cites a few examples showing the photochemistry of 2-nitrodiphenylalkanes and alkenes, which find useful in the synthesis of 2,1-benzisoxazole derivatives, dibenzo(c,f)-(1,2)diazepin-N-oxides and N,N-dioxides, acridones, isatogens etc., that are present in many pharmaceutical drugs.

DOI : 10.1016/j.jphotochem.2019.02.014

Anahtar Kelimeler : o-Nitrobenzylic systems, Photosynthons, Photolabile protecting groups, Aci-nitro intermediates, N-Heterocycles

Cilt: 375
Sayı: 0
Sayfa: 158-165
ISSN: 1010-6030

22

Synthesis, photo-physical, computational and invitro cytotoxic studies of 4-((E)-2-benzylidenehydrazinyl)benzonitrile derivatives

Araştırma Makalesi

Kaynak :

Science Direct

Yayıncı :

Journal of Photochemistry and Photobiology A: Chemistry

Yazar(lar) :

Kamini Tripathi , Abhishek Rai , Avinash Kumar Sonkar , Saurabh Yashaswee , Surendra Kumar Trigun , Lallan Mishra

Yıl :

2019

Journal of Photochemistry and Photobiology A: Chemistry

Yayıncı Web Sitesi Tam Metin Özet Ek Bilgiler

Kaydet

Hydrazones of type 4-((E)-2- benzylidenehydrazinyl)benzonitriles were obtained by the condensation of 4-cyanophenylhydrazine hydrochloride separately with 4-diethylaminosalicylaldehyde(M1), 5-nitrosalicylaldehyde(M2), 5-chlorosalicylaldehyde(M3), 2-hydroxylnaphthylaldehyde(M4), 2-acetylpyridine(M5) 2,6-diacetylpyridine(M6) and 2-methoxynaphthylaldehyde(M7) in methanol (Scheme 1). They were characterized using physico- chemical techniques and x-ray crystallography. Their absorption, emission spectra and fluorescence life time measured in solution as well as in the solid state, display the effect of substituents on their properties. All compounds except M2 and M3, display strong emission. The compounds, M1 and M6 exhibit in vitro cytotoxicity against MDA MB435 s (melanoma) with IC50 values as 12 × 10-5, 1.3 × 10-5 respectively. The compound, M1 also displays activity against C6 (glioma) with IC50 value of 5.9 × 10-5 M.

DOI : 10.1016/j.jphotochem.2019.02.013

Anahtar Kelimeler : 4-((E)-2- benzylidenehydrazinyl)benzonitriles derivatives, X-ray crystallography, Solid state emission, Life time fluorescence, Cytotoxicity

Cilt: 375
Sayı: 0
Sayfa: 252-260
ISSN: 1010-6030

23

Photo-catalytic degradation of triclosan with UV/iodide/ZnO process: Performance, kinetic, degradation pathway, energy consumption and toxicology

Araştırma Makalesi

Kaynak :

Science Direct

Yayıncı :

Journal of Photochemistry and Photobiology A: Chemistry

Yazar(lar) :

Hossein Azarpira , Mohsen Sadani , Mehrnoosh Abtahi , Najmeh Vaezi , Soheila Rezaei , Zahra Atafar , Seyed Mohsen Mohseni , Maryam Sarkhosh , Mansour Ghaderpoori , Hassan Keramati , Rokhsane Hosseini Pouya , Abbas Akbari , Vahid fanai

Yıl :

2019

Journal of Photochemistry and Photobiology A: Chemistry

Yayıncı Web Sitesi Tam Metin Özet Ek Bilgiler

Kaydet

This study develops UV/Iodide/ZnO (UIZ) photo reactor to employs it for degradation, dechlorination and mineralization of triclosan (TCS) content of wastewaters. Degradation efficiency of the UV-only, UV/ZnO, UV/Iodide and UIZ processes were determined as 12.3%, 37.3%, 50.43% and 89.83% respectively, at 20 min reaction time, 10 mg L−1 TCS concentration and pH of 7. Findings indicated that the TCS completely degraded within 20 min treatment time. According to Weight ratio evaluations, the 1.26:2:10 ration is the optimal Weight ratio of Iodide /ZnO/TCS in the UIZ process. Analyzing effluents of the UIZ reactor by liquid chromatography/mass spectroscopy after 5, 10, 15 and 20 min reaction time revealed that TCS decomposes to ring-shaped compounds in less than 10 min and all TCS and its metabolites convert to linear compounds within 15 min reaction time. Investigating kinetic of the process through a pseudo first-order model using 1 to 10 mg L−1 TCS over 1 to 15 min reaction time demonstrated that the observed rate constant (kobs) decreases from 0.3405 to 0.0687 min−1 and the observed TCS degradation rate (robs) increases from 3.405 to 13.74 mg L−1 min−1 with increasing the TCS concentration. Furthermore, electrical energy consumption (EEO) of the UIZ process was calculated with kinetic model 2.48 to 12.29 and with merit-figure model 2.87 (2.87–8.95) to 14.88 (14.88–33.02) kW h m−3 from 1 to 10 mg L−1, respectively. In addition, the effect of co-existing water anions on degradation of 10 mg L−1 TCS was explored during 20 min processing. While 100% degradation was achieved in the absence of any anion, adding nitrate, as the most effective anion, decreased the TCS degradation to 72.88%. The highest dechlorination was observed at Iodide/ZnO weight ratio 1.26:1 and pH 9. Mineralization of TCS by UIZ process was achieved 38.6% after 15 min reaction time. In presence of the effluents extracted after 10 min TCS degradation (even after long incubation periods), no growth inhibition was observed using Analysis of the effluent dilution effect and toxicity assessment on Escherichia coli. Finally, feeding effluents of the UIZ photoreactor to cyclic rotating-bed biological reactor (CRBR) helped to reduce COD nearly completely after 1.5 h aeration, respectively. Therefore, the proposed UIZ/CRBR process is a promising technology for efficient treatment of the wastewaters containing TCS.

DOI : 10.1016/j.jphotochem.2018.10.041

Anahtar Kelimeler : Iodide, Energy consumption, Kinetic, Degradation pathway, Intermediate

Cilt: 371
Sayı: 0
Sayfa: 423-432
ISSN: 1010-6030

24

Enhancement of photocatalytic activity of Gd(OH)3 nanoparticles by Pd deposition for reduction of CO2 to methanol

Araştırma Makalesi

Kaynak :

Science Direct

Yayıncı :

Journal of Photochemistry and Photobiology A: Chemistry

Yazar(lar) :

Saedah R. Al-Mhyawi , Mohamed Abdel Salam

Yıl :

2018

Journal of Photochemistry and Photobiology A: Chemistry

Yayıncı Web Sitesi Tam Metin Özet Ek Bilgiler

Kaydet

A hydrothermal method was used to prepare Gd(OH)3 nanoparticles; then palladium was doped into the surface of Gd(OH)3 nanoparticles by a photoassisted deposition method. Different characterization techniques such as XRD, PL, UV–vis, XRD, TEM and BET surface area were used for characterization of Gd(OH)3 and Pd/ Gd(OH)3 nanoparticles samples. The photocatalytic performance of Gd(OH)3 and Pd/ Gd(OH)3 nanoparticles samples was studied for the photocatalytic reduction of CO2 under visible light. The results reveal that weight percent of doped palladium plays important role in control band gap of Gd(OH)3 nanoparticles and prevent electron-hole recombination rate. Also, it was noticed that BET surface area of Gd(OH)3 nanoparticles was decreased from 55 to 42 m2/g by changing weight percent of palladium from zero to 0.8 wt%, respectively, due to blocking of some pores of Gd(OH)3 nanoparticles by deposition of palladium. XPS results reveal that palladium was doped as metallic palladium. 0.6 wt% Pd-Gd(OH)3 nanoparticles photocatalyst has the highest photocatalytic activity compared with the other photocatlysts, and it can be used five times without loss of its photocatalytic activity.

DOI : 10.1016/j.jphotochem.2018.08.024

Anahtar Kelimeler : CO2reduction, Gd(OH)3 nanoparticles, Pd deposition, Photocatalyst

Cilt: 367
Sayı: 0
Sayfa: 89-93
ISSN: 1010-6030

25

High performance plasmonic activation of Ag on β-Ag2WO4/BiVO4 as nanophotocatalyst for oxidation of alcohols by incident visible light

Araştırma Makalesi

Kaynak :

Science Direct

Yayıncı :

Journal of Photochemistry and Photobiology A: Chemistry

Yazar(lar) :

Parvin Askari , Sajjad Mohebbi , Trong-On Do

Yıl :

2018

Journal of Photochemistry and Photobiology A: Chemistry

Yayıncı Web Sitesi Tam Metin Özet Ek Bilgiler

Kaydet

A new and high efficient ternary Ag on β-Ag2WO4/BiVO4 as a visible light driven nanophotocatalyst toward oxidation of alcohols was synthesized by the ultrasonic irradiation in combination with hydrothermal decomposition method. This photosensitive catalyst was characterized using FT-IR, FE-SEM imaging, TEM, EDS, XRD, XPS, UV–vis, PEC and PL techniques. The photocatalytic performance of this nanocomposite is more than 90% conversion that significantly is higher than either pure Ag/β-Ag2WO4 or BiVO4 nanoparticles. This such high activity is related to efficient charge separation that could be contributed to the fast charge transfer on the Ag/β-Ag2WO4. This surface plasmon resonance effect is due to the creation of Ag(0) on the surface of Ag2WO4, which causes narrow band gap which accelerates effective energy transfer. Also, the mechanistic study reveals that positive holes and hydroxyl radicals have the most influence on the oxidation reaction progress. Upon reusing of this heterogeneous photocatalyst for seven times no significant loss of activity was detected. In addition, this reusable and robust photocatalyst has high activity and selectivity under visible light using mild oxidant H2O2 at ambient temperature.

DOI : 10.1016/j.jphotochem.2018.08.013

Anahtar Kelimeler : Heterogeneous, Surface plasmon resonance, Photocatalyst, Alcohol oxidation

Cilt: 367
Sayı: 0
Sayfa: 56-65
ISSN: 1010-6030

26

Fabrication and optimization of a sensitive tetracycline fluorescent nano-sensor based on oxidized starch polysaccharide biopolymer-capped CdTe/ZnS quantum dots: Box–Behnken design

Araştırma Makalesi

Kaynak :

Science Direct

Yayıncı :

Journal of Photochemistry and Photobiology A: Chemistry

Yazar(lar) :

Hamideh Elmizadeh , Majid Soleimani , Farnoush Faridbod , Ghasem Rezanejade Bardajee

Yıl :

2018

Journal of Photochemistry and Photobiology A: Chemistry

Yayıncı Web Sitesi Tam Metin Özet Ek Bilgiler

Kaydet

A novel optical nano-sensor for tetracycline hydrochloride (TH) detection as a small molecule model was prepared by modifying the surface of CdTe/ZnS QDs with a biopolymer based cap, called poly ((2-dimethylaminoethyl) methacrylate) grafted onto oxidized starch (OS-g- PDMAEMA), via a facile method. The preparation of the nano-sensor was optimized by employing a 4-factor Box–Behnken statistical design to achieve a nano-sensor with maximum fluorescence intensity for sensitive determination of TH in real samples. The optimized nano-sensor based on CdTe/ZnS QDs were characterized by fluorescence spectroscopy, UV–vis spectrophotometry, transmission electron microscopy (TEM), Fourier transforms infrared (FTIR) and thermo-gravimetric (TG) analysis techniques. It was found that the fluorescence intensity of modified QDS (CdTe/ZnS-OS-g-PDMAEMA QDs) at 520 nm (excitation at 375 nm) was selectively quenched in the presence of trace amounts of TH drug. In this method, a simple, highly sensitive, selective and rapid analytical approach was used for the determination of TH in the concentration range of 9.14 × 10−9 mol L−1–7.23 × 10−6 mol L−1 with a detection limit of 2.74 × 10−9 mol L−1. The designed nano-sensor can be successfully applied for the determination of TH in complex matrixes (pharmaceutical formulations, urine, saline and glucose serums) with satisfactory analytical results.

DOI : 10.1016/j.jphotochem.2018.08.021

Anahtar Kelimeler : Fluorescence optical nano-sensor, Quantum dots, Boxu2013Behnken design, Tetracycline hydrochloride

Cilt: 367
Sayı: 0
Sayfa: 188-199
ISSN: 1010-6030

27

MgCl2 activation of CdS films: An alternative for CdCl2

Araştırma Makalesi

Kaynak :

Science Direct

Yayıncı :

Journal of Photochemistry and Photobiology A: Chemistry

Yazar(lar) :

W.G.C. Kumarage , R.P. Wijesundera , V.A. Seneviratne , C.P. Jayalath , N. Kaur , E. Comini , B.S. Dassanayake

Yıl :

2018

Journal of Photochemistry and Photobiology A: Chemistry

Yayıncı Web Sitesi Tam Metin Özet Ek Bilgiler

Kaydet

A detailed study on MgCl2 solution treatment on chemical bath deposited CdS (CBD-CdS) is reported. MgCl2 treated samples have shown the higher VOC and ISC values in the photoelectrochemical (PEC) cell compared to non-treated samples. The improved PEC cell performance in the MgCl2 treated samples were found to be higher carrier concentration and improved effective surface area as well as grain boundary passivation. The MgCl2 treatment was found to increase the cluster size of CdS thin films and the formation of clusters was identified to be due to coalescence of small clusters. Increasing the duration of MgCl2 treatment led to formation of large and densely packed surface morphology. Additionally, the relative flat band potential (VFB) value was found to be tunable with MgCl2 treatment duration and the best photo-activity and highest density of packing was observed for the CdS films which underwent MgCl2 treatment for 14 min.

DOI : 10.1016/j.jphotochem.2018.08.029

Anahtar Kelimeler : CBD, CdS, MgCl2, Activation, Mott-Schottky

Cilt: 367
Sayı: 0
Sayfa: 171-177
ISSN: 1010-6030

28

A Schiff base fluorescent chemsensor for the double detection of Al3+ and PPi through aggregation induced emission in environmental physiology

Araştırma Makalesi

Kaynak :

Science Direct

Yayıncı :

Journal of Photochemistry and Photobiology A: Chemistry

Yazar(lar) :

Qi Wang , Xiaoye Wen , Zhefeng Fan

Yıl :

2018

Journal of Photochemistry and Photobiology A: Chemistry

Yayıncı Web Sitesi Tam Metin Özet Ek Bilgiler

Kaydet

In this paper, a simple Schiff base fluorescent probe was synthesized by aggregation-induced emission. The probe detected Al3+ with an “off-on” behavior, because the molecular rotation was restricted, the molecular rigidity was increased. The stoichiometry ratio of the probe to Al3+ was 1: 2. The detection limit of Al3+ was 0.39 μM, which was exceedingly below the WHO standard (7.41 μM) and the acceptable Al3+ levels of (1.85 μM) in drinking water. In view of the strong binding ability between pyrophosphate (PPi) and Al3+, the probe-Al3+ detected PPi with an “on-off” behavior over other physiological relevant metal ions, anion and biomolecules investigated in this study. The detection limit of PPi was 0.75 μM. Therefore, the proposed probe is a promising fluorescent sensor that can be used to detect Al3+ and PPi.

DOI : 10.1016/j.jphotochem.2018.03.004

Anahtar Kelimeler : Schiff base, Aggregation induced emission, Al3+, PPi, Fluorescent probe

Cilt: 358
Sayı: 0
Sayfa: 92-99
ISSN: 1010-6030

29

Robust sensitizer-assisted platinized titanium dioxide in photocatalytic removal of 4-chlorophenol in water: Light tunable sensitizer

Araştırma Makalesi

Kaynak :

Science Direct

Yayıncı :

Journal of Photochemistry and Photobiology A: Chemistry

Yazar(lar) :

Kuo-Ting Wang , Norman Lu , Chun-Wei Chu , Tsung-Yao Feng , Chih-Chieh Kung , Wen-Han Tu , Yun-Peng Yeh , Joseph S. Francisco

Yıl :

2018

Journal of Photochemistry and Photobiology A: Chemistry

Yayıncı Web Sitesi Tam Metin Özet Ek Bilgiler

Kaydet

The photodegradation of 4-chlorophenol (4-CP) by using 3,3′-Pt(dcbpy)(bdt), 33Pt(bdt), sensitized platinized titanium dioxide, Pt-TiO2, under 420 nm light irradiation while bubbling O2 has been studied in this research. The 84% degradation efficiency was reached in 3 h, and this efficiency was much better than that assisted by 4,4′-Pt(dcbpy)(bdt), 44Pt(bdt), under the same conditions using 420 nm light. The possible reason is due to the difference in UV–vis absorption spectra of these two dyes around 420 nm. The 33Pt(bdt) dye which has been first synthesized in this study and has the twisted geometry shows larger open circuit voltage, higher molar extinction coefficient of π–π* transition around 420 nm and much better in 4-CP photodegradation than its 4,4′-analogue under blue light. Under 580 nm light irradiation for 6 h, both 33Pt(bdt) and 44Pt(bdt) sensitized Pt-TiO2-catalyzed 4-CP degradation with O2 bubbling could reach 94% photodegradation efficiency based on metal ligand charge transfer, MLCT, mechanism. Fluorescence quenching experiments have been carried out to affirm the enhanced photo-induced charge separation and transmission during 33Pt(bdt)-assisted reaction. To our knowledge, this is the first time to show that under blue or yellow light irradiation dye-sensitized Pt-TiO2-catalyzed 4-CP degradations have different mechanisms and are tunable by light wavelength. Dye 33Pt(bdt) is more robust and better sensitizer in 4-CP degradation than 44Pt(bdt) under blue light. Thus, by the careful selection of light wavelength and using the robust dye, one can tune the system to efficiently harvest specific visible light for the photodegradation of small organic pollutants.

DOI : 10.1016/j.jphotochem.2018.02.031

Anahtar Kelimeler : 33Pt(bdt), 3, 3u2032 Pt(dcbpy)(bdt), 44Pt(bdt), 4, 4u2032-Pt(dcbpy)(bdt), 33PtCl2, 3, 3u2032-PtCl2(dcbpy), 44PtCl2, 4, 4u2032-PtCl2(dcbpy), 4-Chlorophenol, Sensitized, Photocatalytic, Platinized TiO2, Visible light irradiation, Tunable

Cilt: 358
Sayı: 0
Sayfa: 100-110
ISSN: 1010-6030

30

Highly selective fluorescent probe for switch-on Al3+ detection and switch-off F− detection

Araştırma Makalesi

Kaynak :

Science Direct

Yayıncı :

Journal of Photochemistry and Photobiology A: Chemistry

Yazar(lar) :

Chiseop Lim , Hansol Seo , Jun-Hyeak Choi , Ki-Soo Kim , Aasif Helal , Hong-Seok Kim

Yıl :

2018

Journal of Photochemistry and Photobiology A: Chemistry

Yayıncı Web Sitesi Tam Metin Özet Ek Bilgiler

Kaydet

A new 2-(2′-hydroxyphenyl)thiazole-4-carboxaldehyde based fluorescent probe (1) was designed and synthesized for sequential detection of Al3+ and F− ions in methanol. Probe 1 selectively detected Al3+ through a “switch on” response driven by the selective complexation of Al3+ ions with hemiacetal 2 formed from 1 in methanol. This process was mediated by combined excited-state intramolecular proton transfer (ESIPT) and chelation-induced enhanced fluorescence (CHEF) effects. Probe 2 bound Al3+ ions in a 1:1 stoichiometry with a good association constant of Ka = 9.1 × 104 M−1. The in situ generated 2·Al3+ (1:1) complex detected F− ions sequentially through a “switch off” response, with a 1:3 stoichiometry observed between 2·Al3+ (1:1) and F−. The lowest limits of detection (LODs) for Al3+ and F− ions in methanol were determined to be 9.24 × 10−7 and 1.4 × 10−5 M, respectively. The probe was also used to detect Al3+ ions with a slightly lower LOD and binding constant in aqueous methanol (1:19).

DOI : 10.1016/j.jphotochem.2018.01.012

Anahtar Kelimeler : Fluorescent probe, Hemiacetal, Aluminum ion selectivity, Fluoride, ESIPT, CHEF

Cilt: 356
Sayı: 0
Sayfa: 312-320
ISSN: 1010-6030

Yayın Yılı

Sınırla

Doküman Türü Tümü

Disiplin Tümü

Disipline Göre İlgililik

Alt Disiplin Tümü

Konu Tümü

Dergi İsmi Tümü

Veri Tabanı Tümü

Doküman Türü

Tümü

Disiplin

Tümü

Alt Disiplin

Tümü

Konu

Tümü

Dergi İsmi

Tümü

Veri Tabanı

Tümü