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Enhanced photocatalytic hydrogen evolution from band-gap tunable Ag2S:X (X=Ni, Co, Zn, Mn) nanocrystals: Effect of transition metal ions
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Dergi:
Journal of Photochemistry & Photobiology A: Chemistry
Yayıncı:
Elsevier Science
Yazar(lar) :
Gizem Yanalak , Adem Sarılmaz , Gizem Karanfil , Emre Aslan , Faruk Özel , İmren Patır Hatay
Konu :
Ag2S, Acanthite, Doping, Photocatalytic, Hydrogen production
Yıl :
2020
Journal of Photochemistry & Photobiology A: Chemistry
Yayıncı Web Sitesi
Kaydet
In the present work, Ni, Co, Zn and Mn doped Ag2S nanocrystal catalysts were prepared via the hot-injection technique which is one of the top-down approach. The nanocrystals were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscope (SEM), diffuse reflectance spectroscopy (DRS), UV−vis spectroscopy (UV) and cyclic voltammetry (CV) to illuminate the crystal properties and the photocatalytic mechanism. The presence of doping each of the transition metals on Ag2S nanocrystals were tested for their performance in the photocatalytic hydrogen evolution from water containing TEOA and EY as a hole scavenger and photoabsorber, respectively. The results demonstrated that Ni, Co, Zn and Mn doped Ag2S nanocrystals were showed higher photocatalytic activity as compared with the Ag2S under visible light irradiation source. In addition, transition metal consisting Ag2S catalysts, which in view of the limited literatures, provides new insights for expanding the application of chalcogenide catalysts.
Anahtar Kelimeler : Ag2S, Acanthite, Doping, Photocatalytic, Hydrogen production, article
Cilt: 394
ISSN: 1010-6030
Sınıflandırma :
2
Reordering of polystyrene gel due to multiple swelling in organic vapor - Fast transient fluorescence technique study
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Dergi:
Journal of Photochemistry and Photobiology A-Chemistry
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
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
Synthesis of photochromic 2,3-bis(5-methyl-2-phenyl-4-thiazolyl)-1,4- naphthoquinone derivatives
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Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Zonguldak Bülent Ecevit Üniversitesi
Yazar(lar) :
Zonguldak Bülent Ecevit Üniversitesi
Konu :
2, 3-Diaryl-1, 4-naphthoquinone, Conversion ratio, Diarylethene, Photochromism
Yıl :
2011
Journal of Photochemistry and Photobiology A: Chemistry
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2,3-Bis(5-methyl-2-phenyl-4-thiazolyl)-1,4-naphthoquinone 1-O, its monoethylene acetal 2-O and methylated derivatives 3-O and 4-O were synthesized and their photochromic properties were investigated. While bisarylnaphthoquinone 1-O was nonphotochromic, its monoacetal 2-O and methylated derivatives 3-O and 4-O displayed good photochromism. Among them, the isomer 4-O recorded a remarkable diastereomeric excess (98.40%) with high conversion ratio (96.20%) upon UV irradiation. © 2011 Elsevier B.V. All rights reserved.
DOI : 10.1016/j.jphotochem.2011.01.016
Anahtar Kelimeler : 2, 3-Diaryl-1, 4-naphthoquinone, Conversion ratio, Diarylethene, Photochromism, article
Cilt: 219
Sayı: 1
ISSN: 1010-6030
Sınıflandırma :
Kimya %100
Kataliz %84
4
Synthesis and G-quadruplex binding study of a novel full visible absorbing perylene diimide dye
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Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Ege Universitesi
Yazar(lar) :
Dinçalp H. , Kizilok Ş. , Birel O.H. , Içli S.
Konu :
Charge transfer, G-quadruplex, Perylene diimide, Singlet oxygen, Solvatochromism
Yıl :
2012
Journal of Photochemistry and Photobiology A: Chemistry
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Kaydet
A novel perylene diimide dye containing glucopyranosyl groups in 1- and 7-positions of the perylene ring has been synthesized and characterized to obtain highly efficient and stable photosensitized material in photodynamic therapy. Solvatochromic studies on this dye in solvents of different polarities have indicated that absorption bands of the dye cover the whole visible spectrum in more polar organic solvents. It shows absorption bands localized at 350-500 nm and 600-850 nm in benzonitrile giving a green color. Also, the dye has a wide absorption region which covers the wavelength between 400 and 800 nm in more polar solvents by changing the dye concentration in the solvents. Singlet oxygen generation efficiency and G-quadruplex binding affinity of the dye have been tested. Theoretical calculations through semi-empirical methods have been performed and a detailed spectroscopic assignment of the molecule has been also presented. © 2012 Elsevier B.V.
Anahtar Kelimeler : Charge transfer, G-quadruplex, Perylene diimide, Singlet oxygen, Solvatochromism, article
Cilt: 235
ISSN: 1010-6030
Sınıflandırma :
5
Spectral-luminescent and solvatochromic properties of 2-(3 '-coumarinyl)-5-(2 '-(R-amino)-phenyl)-1,3,4-oxadiazoles
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Dergi:
Journal of Photochemistry and Photobiology A-Chemistry
Yayıncı:
Elsevier Science Sa
Yazar(lar) :
Posokhov Yevgen , Sytnik Konstantin , Ocakoglu Kasim , Kus Mahmut , Icli Siddik
Konu :
2-(3 '-Coumarinyl)-5-(2 '-(R-amino)-phenyl)-1, 3, 4-oxadiazole, Solvatochromism, Solvent relaxation
Yıl :
2012
Journal of Photochemistry and Photobiology A-Chemistry
Yayıncı Web Sitesi
Kaydet
Spectral-luminescent properties of the newly synthesized 2-(3'-coumarinyl)-5-(2'-(R-amino)-phenyl)1,3,4-oxadiazoles has been investigated in solvents of various polarity and hydrogen-bonding ability. It has been found that for all the studied compounds no excited state intramolecular proton transfer occurs despite the presence of coumarinyl fragment - electron acceptor effect of the coumarinyl fragment is not sufficient to increase the excited state acidity of the amino group. It has been found that the absorption spectra of the studied compounds shift to higher energy with increase in solvent polarity, whereas corresponding fluorescence spectra shift to lower energy with solvent polarity increase. It has been suggested that long-wavelength shifts of the fluorescence spectra of the studied compounds with increase in solvent polarity is caused by the solvent relaxation. The observed solvent relaxation effect allow us to propose some of the studied compounds as potential probes to monitor changes in solvent relaxation in low-polar media and as potential probes for rigidochromic effect. (C) 2011 Elsevier B.V. All rights reserved.
Anahtar Kelimeler : 2-(3 '-Coumarinyl)-5-(2 '-(R-amino)-phenyl)-1, 3, 4-oxadiazole, Solvatochromism, Solvent relaxation, article
Cilt: 227
Sayı: 1
ISSN: 1010-6030
Sınıflandırma :
6
Photodynamic therapy and nuclear imaging activities of SubPhthalocyanine integrated TiO2 nanoparticles
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Dergi:
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Yayıncı:
Ege Universitesi
Yazar(lar) :
Onaran Fatma Yurt , Sarı Fa , Ocakoğlu Mine İnce , Colak Suleyman Gokhan , Er O , Soylu Hale Melıs , Avcı Cıgır Bıray
Yıl :
2018
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Yayıncı Web Sitesi
Kaydet
Anahtar Kelimeler : article
Cilt: 367
Sayı: .
Sınıflandırma :
7
Decolourising textile wastewater with modified titania: the effects of inorganic anions on the photocatalysis
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Dergi:
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Yayıncı:
ELSEVIER SCIENCE SA
Yazar(lar) :
M Sokmen , A Ozkan
Konu :
photocatalytic oxidation, silver-loaded TiO2, anions, textile dyes
Yıl :
2002
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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In this study, the environment of the TiO2 photocatalyst modified with silver was investigated. The photocatalytic degradation of textile dye Astrazone Orange G was carried out in the presence and absence of common inorganic salts to determine the effect of the anionic species. It was shown that degradation of dyes in the first 20 min in the presence of anions exhibited different behaviour. While the catalytic activity of TiO2 was significantly retarded in the presence of common inorganic anions it was not affected or was promoted in many cases with Ag-loaded TiO2. In TiO2/UV system positive charged holes (h(+)) might be scavenged by the negatively charged anions and the adsorption of dyes on the surface of TiO2 was significantly inhibited. However, this inhibition effect was not observed with modified titania and possible mechanism was thought to be the trapping of the conductive band electrons by silver islands producing more positively charged holes as well as the reduction of the band gap energy. Additionally, the adsorption of the dye on the Ag-TiO2 catalyst surface was significantly increased in the presence of anions and this might be responsible for another promoting effect. (C) 2002 Elsevier Science B.V. All rights reserved.
DOI : 10.1016/S1010-6030(01)00627-X
Anahtar Kelimeler : photocatalytic oxidation, silver-loaded TiO2, anions, textile dyes, article

ISSN: 1010-6030
Sınıflandırma :
8
Disinfection of E-coli by the Ag-TiO2/UV system: lipidperoxidation
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Dergi:
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Yayıncı:
ELSEVIER SCIENCE SA
Yazar(lar) :
M Sokmen , F Candan , Z Sumer
Konu :
Escherichia coli, photocatalytic degradation, silver loading, TiO2UV, lipidperoxidation
Yıl :
2001
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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The photocatalytic disinfection of Escherichia coli, a pathogenic micro-organism. was investigated. An aqueous suspension of the micro-organism (1 x 10(8) cfu/ml) and neat TiO2 or silver-loaded TiO2 Were irradiated with a high pressure mercury lamp for various time periods at neutral pH (7.0). Silver loading (1%, w/w) dramatically reduced the illumination time for complete degradation (less than 1-2 min) and minimum catalyst concentration was determined as 0.1 mg/mL Possible killing mechanism and intermediate products were also determined. Occurrence of lipidperoxidation which produces malondialdehyde (MDA) was proposed but the method employed was so effective that all micro-organisms and intermediate products were further degraded to harmless products. (C) 2001 Elsevier Science B.V. All rights reserved.
DOI : 10.1016/S1010-6030(01)00497-X
Anahtar Kelimeler : Escherichia coli, photocatalytic degradation, silver loading, TiO2UV, lipidperoxidation, article

ISSN: 1010-6030
Sınıflandırma :
Kimya %96
Kataliz %63
9
Preparation and photochromic properties of 2,3-bisarylbenzfindenones
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Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Bülent Ecevit Üniversitesi
Yazar(lar) :
Bülent Ecevit Üniversitesi
Konu :
Bisarylbenzfindenols, Bisarylbenzfindenone, Diarylethene, Photochromism
Yıl :
2013
Journal of Photochemistry and Photobiology A: Chemistry
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From 2,3-dibromobenz[f]indenone, four compound: 2,3-bis(5-methyl-2-phenyl- 4-thiazolyl)benz[f]indenone 1O, 2,3-bis(3,5-dimethyl-4-isoxazolyl)benz[f] indenone 2O, 3-(3,5-dimethyl-4-isoxazolyl)-2-(5-methyl-2-phenyl-4-thiazolyl) benz[f]indenone 3O and 2,3-bis(5-methyl-2-phenyl-4-thiazolyl)benz[f]indenol 4O were prepared, and their photochromic properties were investigated. Among them, photochrome 1O (weak photochromic) and its bisthiazolylbenz[f]indenol derivative 4O displayed photochromism. During ring closure photoreaction, photochrome 4O showed high conversion ratio (98.4%) with low diastereomeric excess (38%). © 2013 Elsevier B.V. All rights reserved.
DOI : 10.1016/j.jphotochem.2013.01.012
Anahtar Kelimeler : Bisarylbenzfindenols, Bisarylbenzfindenone, Diarylethene, Photochromism, article
Cilt: 257
ISSN: 1010-6030
Sınıflandırma :
10
Preparation of La-Dy-CeO2 ternary compound: Examination of photocatalytic and photoluminescence properties
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Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier
Yazar(lar) :
Handan Özlü Torun , Rabia Kırkgeçit , Fatma Kılıç Dokan , Esra Çırçır Öztürk
Konu :
CeO2, Co-doping, Photocatalytic, Photoluminescence, Synergistic Effect
Yıl :
2021
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı Web Sitesi
Kaydet
This study investigated the photochemical changes of cerium oxide (CeO2) with the contribution of rare earth ions. Lanthanum (La) and Dysprosium (Dy) were added to the CeO2 crystal structure simultaneously via citric acid sol-gel synthesis. Following synthesis, the sintering temperatures were chosen as 800 and 1000 °C. Results of X-ray diffraction (XRD) analysis showed that the doped and undoped CeO2 compounds exhibited a cubic phase. The surface morphology of the samples was examined by scanning electron microscopy (SEM). The particle sizes varied in the range of 90−150 nm and the composite elements were observed to maintain the stoichiometric ratio. Compound impurity control was performed using energy dispersive X-ray (EDX). Lattice changes in the compounds were revealed via Raman spectroscopy, which indicated that the La and Dy had caused changes in the CeO2 symmetry. The photocatalytic behavior of the compounds was investigated using methylene blue degradation. Optical band gaps were calculated and the La and Dy were found to have narrow band spacing. The band gap of the Ce0.85La0.10Dy0.05O2 compound sintered at 1000 °C was 1.63 eV, the rate constant was 9.4 * 10−3 min−1, and the degradation efficiency at 100 min was calculated as 60 %. The photoluminescence spectra exhibited four bands centered at 435, 532, 565, and 610 nm. The emission band at 565 nm was attributed to the transition from the 4F9/2 to the 6H13/2state, whereas the emission bands peaking at 435 nm, 532 nm, and 610 nm can be explained by the intrinsic luminescence of the host lattice.
Anahtar Kelimeler : CeO2, Co-doping, Photocatalytic, Photoluminescence, Synergistic Effect, article
Cilt: 418
ISSN: 1010-6030
Sınıflandırma :
11
Simple synthesis and sensing applications of a new and low cost fluorescent chemosensor for selective recognition and facile removal of Hg2+
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Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier
Yazar(lar) :
Duygu Aydın , İbrahim Yılmaz
Konu :
Fluorescence Quenching, Fluorogenic SensorIsoniazid, Mercury (II) Ions
Yıl :
2021
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı Web Sitesi
Kaydet
A novel 5-(2-Benzothiazolyl)-2-hydroxybenzaldehyde (ALD) based probe NETBZ has been fabricated as a fluorogenic probe for sensitive detection of Hg2+ ions in CH3CN:HEPES (70/30, v/v, pH: 7.0) media. The probe NETBZ exhibited turn-off behavior from blue to colorless under UV light, in the presence of Hg2+ with limit of detection (LOD) (3σ/K) of 14.3 nM. In the presence of various cations (Mn2+, Cr3+, Ba2+, K+, Cu2+, Cd2+, Co2+, Ca2+, Zn2+, Mg2+, Ni2+, Fe2+, Sr2+, Pb2+, Fe3+ and Al3+), no significant changes were observed in its spectral patterns. The mechanism of the NETBZ-Hg2+ system could be thanks to chelation-enhanced fluorescence quenching (CHEQ), which was further confirmed by DFT computation, Job's method, and also 1H-NMR titration. The binding constant of probe NETBZ with Hg2+ from the Benesi-Hildebrand equation was found as 3.67 × 1015 M−3. Furthermore, new fluorescence strips based on TLC plate application for NETBZ and NETBZ-Hg2+ system was fabricated.
Anahtar Kelimeler : Fluorescence Quenching, Fluorogenic SensorIsoniazid, Mercury (II) Ions, article
Cilt: 414
ISSN: 1010-6030
Sınıflandırma :
Kimya %100
Nanokimya %98
12
Photochemistry of nitro-substituted (E)-2-azachalcones with theoretical calculations and biological activities
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Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Recep Tayyip Erdoğan Üniversitesi
Yazar(lar) :
N. Yayli , O. Üçüncü , A. Yaşar , N. Yayli , N.A. Burnaz , S.A. Karaoğlu , M. Küçük
Konu :
Antimicrobial, Antioxidant, Nitro-(E)-2-azachalcone, Photodimerization
Yıl :
2009
Journal of Photochemistry and Photobiology A: Chemistry
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Kaydet
Four new stereoselective dimerization products (4a-c, 5) of m- and p-nitro-substituted (E)-2-azachalcones (2 and 3) were synthesized and tested for antimicrobial and antioxidant activities. Compounds 1-3 showed very good antimicrobial activities against all the tested microorganisms, Escherichia coli, Yersinia pseudotuberculosis, Pseudomonas aeruginosa, Bacillus cereus, Listeria monocytogenes, Staphylococcus aureus, Enterococcus faecalis, and Candida albicans. Five of the compounds tested were radical scavengers with 50% scavenging concentration (SC50) values between 0.130 and 2.047 mg/mL. The monomeric o-nitro-substituted (E)-2-azachalcone (1) showed the highest 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity with the SC50 value of 0.130 mg/mL. Compound 3 was prooxidant and compound 4b was inactive in DPPH test. The higher antimicrobial activity of compound 1 was paralleled with its higher antioxidant activity, which makes it potential agent for the cure of bacterial infections concurrent with oxidative stress. The theoretical calculations based on transition state structures were made to obtain possible photochemical dimerization products of compounds 1-3. The expected dimeric products from calculations coincided with those experimentally produced. © 2009 Elsevier B.V. All rights reserved.
Anahtar Kelimeler : Antimicrobial, Antioxidant, Nitro-(E)-2-azachalcone, Photodimerization, article
Cilt: 203
Sayı: 02.Mar
ISSN: 1010-6030
Sınıflandırma :
13
A study of the density functional methods on the photoabsorption of bodipy dyes
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Dergi:
Journal of Photochemistry and Photobiology A-Chemistry
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
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
14
Experimental assessment of a hybrid process including adsorption/photo Fenton oxidation and Microbial Fuel Cell for the removal of dicarboxylic acids from aqueous solution
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Dergi:
Journal of Photochemistry and Photobiology A-Chemistry
Yayıncı:
Elsevier Science Sa
Yazar(lar) :
Gizem Civan , Burcu Palas , Guelin Ersoz , Sueheyda Atalay , Irene Bavasso , Luca Di Palma
Konu :
Microbial fuel cell, Activated carbon, Adsorption, Photo-Fenton, Succinic acid, Fumaric acid
Yıl :
2021
Journal of Photochemistry and Photobiology A-Chemistry
Yayıncı Web Sitesi
Kaydet
In this study, the application of adsorption/photo Fenton oxidation and Microbial Fuel Cell was investigated for the degradation of dicarboxylic acids such as succinic acid and fumaric acid. The feasibility of a hybrid system combining an adsorption / photo Fenton-like oxidation and biological oxidation in a Microbial Fuel Cell (MFC) was investigated for the removal of succinic acid from aqueous solution. Adsorption and photo Fenton-like oxidation tests were carried out by using Fe-TiO2/AC (AC: Biomass derived activated carbon) as a catalyst. A removal of about 40.8 % was achieved in adsorption tests within 2 h at room temperature and 4 g/L of Fe-TiO2/AC loading. A slight improvement of the pollutant removal from the water phase was observed by the addition of an oxidant (H2O2) and the UV light source. The succinic acid solution was sent to a subsequent treatment in MFC: after 20 days a further removal of the pollutant of about 49.4 % with a mineralization of 35.5 % were observed. The adoption of a bioelectrochemical system allowed to convert the organics into electricity with a coulombic efficiency of 25.0 %. The biochemical oxidation of succinic acid and fumaric acid, the main product of the catalytic oxidation of succinic acid, was then carried out in a microbial fuel cell. A significant TOC reduction was achieved for both compounds, thus proving that they can be successfully used as electron source in microbial fuel cell treatment.
Anahtar Kelimeler : Microbial fuel cell, Activated carbon, Adsorption, Photo-Fenton, Succinic acid, Fumaric acid, article
Cilt: 407
ISSN: 1010-6030
Sınıflandırma :
Kimya %97
Kataliz %97
15
Spectral-luminescent and solvatochromic properties of anticancer drug camptothecin
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DSpace Makaleler
Kaynak 2:
DSpace Makaleler
Dergi:
Journal of Photochemistry and Photobiology A-Chemistry
Yayıncı:
Elsevier Science Sa
Yazar(lar) :
Posokhov , Y , Biner , H , Icli , S
Konu :
camptothecin, solvatochromism, dipolar moments, fluorescence quenching
Yıl :
2003
Journal of Photochemistry and Photobiology A-Chemistry
Kaydet
The spectral characteristics of camptothecin have been investigated in solvents of various polarity and proton donating ability. The effect of the solvent on the spectral characteristics and the dipole moment in the excited state have been estimated. Different theoretical approaches have been compared in order to estimate the excited-state dipole moment. It has been shown that camptothecin's emission is very sensitive to quenching with Co2+ ions. (C) 2003 Elsevier Science B.V. All rights reserved.
Anahtar Kelimeler : camptothecin, solvatochromism, dipolar moments, fluorescence quenching, article
Cilt: 158
Sayı: 1
ISSN: 1010-6030
Sınıflandırma :
16
Spectral properties and G-quadruplex DNA binding selectivities of a series of unsymmetrical perylene diimides
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Dergi:
Journal of Photochemistry and Photobiology A-Chemistry
Yayıncı:
Elsevier Science Sa
Yazar(lar) :
Dincalp Haluk , Avcibasi Nesibe , Icli Siddik
Konu :
perylene diimide, fluorescence quenching, G-quadruplex DNA, human telomerase, anti-cancer agent
Yıl :
2007
Journal of Photochemistry and Photobiology A-Chemistry
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Kaydet
A series of new unsymmetrical perylene diimides have been synthesized to investigate their binding selectivities to G-quadruplex DNA structure, a unique four-stranded DNA motif, which is significant to the regulation of telomerase activity. The structures of the perylene diimides have been characterized by IR spectrophotometer, H-1 NMR, C-13 NMR, MS, TGA and time-resolved instruments. Spectrochemical behaviors have been investigated by visible absorption and fluorescence emission spectra. The spectral characterization of the compounds has been investigated in five common organic solvents of different polarity and in water (in 170 mM phosphate buffer at pH 6). Marked red shifts of absorbance and fluorescence emission bands of the compounds in aqueous solution are compared with the other organic solutions. The fluorescence quantum yields are determined low in more polar solvents and also calculated to be about less than about 0.05 in aqueous solution because of the aggregation effects. Photodegradation rate constants (k(p)) of the synthesized compounds have been compared under xenon lamp irradiation in acetonitrile solution. Binding abilities of the synthesized perylene diimides to different form of DNA strands have been investigated by visible absorption and fluorescence spectroscopy in the phosphate buffer solutions. Also, pH-dependent aggregation and G-quadruplex DNA binding selectivity of these ligands have been compared. Among these ligands, N-(2,6-diisopropylphenyl)-N'-(4-pyridyl)-perylene-3,4,9,10-tetracarboxylic diimide (PYPER) has been found to be the most selective interactive ligand for G-quadruplex formed in the G4'-DNA structure. PYPER has shown a significant selectivity to G4'-DNA which is comprised of d(TTAGGG) repeats, known as human telomeres, in the phosphate buffer at pH 6. The absorption maximum of the PYPER/G4'-DNA complex has given bathochromic shift of 7 nm with respect to the absorption maximum of DNA-free solution of PYPER in phosphate buffer at pH 6. Fluorescence quenching experiments between PYPER and G4'-DNA show that PYPER demonstrates about a 9.3-fold selectivity for binding to G4'-DNA versus ds-DNA base pairs with the bimolecular rate constant of 0.95 x 10(12) M-1 s(-1). (c) 2006 Elsevier B.V. All rights reserved.
Anahtar Kelimeler : perylene diimide, fluorescence quenching, G-quadruplex DNA, human telomerase, anti-cancer agent, article
Cilt: 185
Sayı: 1
ISSN: 1010-6030
Sınıflandırma :
17
Spectroscopic, electrochemical and electrocolorimetric properties of novel 2-(2'-pyridyl)-1H-benzimidazole appended bay-substituted perylene diimide triads
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Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier B.V.
Yazar(lar) :
Pekdemir F. , Orman E.B. , Selçuki N.A. , Özkaya A.R. , Salih B. , Şengül A.
Konu :
Benzimidazole, Density functional theory, Electrochemistry, Perylene diimide, Pyridine
Yıl :
2019
Journal of Photochemistry and Photobiology A: Chemistry
Kaydet
In this study, four new perylene diimide (PDI)derivatives incorporating 2-(2'-pyridyl)-1H-benzimidazole (2PBI)chromophores at the imide positions, in which 1 bearing non-bay-substituted perylene core, and those having four substituents at 1,6,7,12-bay positions of the perylene core, namely 2 bearing electron-withdrawing chlorine atoms, 3 bearing electron-donating 4-methoxyphenoxy groups and 4 bearing non-electron-donating 4-tert-butylphenoxy groups, respectively were synthesized and fully characterized by FT-IR, 1 H NMR, 13 C NMR, MALDI-TOF mass spectrometry and UV/Vis spectroscopy. The thermal properties were measured by thermogravimetric analysis (TGA)which showed that the materials (1-4)are thermally very stable (T d > 450 °C). DFT was performed for geometry optimizations, and TDDFT was used to compare the calculated and the experimental UV/Vis electronic spectra at the B3LYP/6–311 G(d)level. Detailed measurements were carried out by the use of electroanalytical, spectroscopic and colorimetric techniques in order to understand redox natures, color changes and optoelectronic characters of the novel compounds. These 2PBI-functionalized PDI triads showed reversible reduction processes, chemically stable reduced species and considerably low HOMO-LUMO band gaps, as the new worthy members of photoactive charge transport materials for optoelectronic and photovoltaic systems. In addition, with distinct color changes associated with their redox processes in the solution, these new triads displayed great capacity for application in electrochromic devices. The emission maxima of the compounds were found to be red shifted in the solid state. © 2019 Elsevier B.V.
Anahtar Kelimeler : Benzimidazole, Density functional theory, Electrochemistry, Perylene diimide, Pyridine, article
Cilt: 379
ISSN: 1010-6030
Sınıflandırma :
18
Novel fluorescent coumarin-thiophene-derived Schiff bases: Synthesis, effects of substituents, photophysical properties, DFT calculations, and biological activities
Dergi Makalesi

Dergi Makalesi
Kaynak :
DSpace Makaleler
Dergi:
Journal Of Photochemistry And Photobiology A-Chemistry
Yayıncı:
Elsevier Science Sa
Yazar(lar) :
Issah Yahaya , Meryem Chemchem , Burcu Aydiner , Nurgul Seferoglu , Fulya Erva Tepe , Leyla Acik , Zeynel Seferoglu
Konu :
Coumarin-thiophene, Schiff bases, Effects of substituents, Photophysical properties, DFT calculations, Biological activity
Yıl :
2019
Journal Of Photochemistry And Photobiology A-Chemistry
Yayıncı Web Sitesi
 Piri Tam Metin Bulucu
Kaydet
Novel fluorescent coumarin-thiophene appended Schiff bases have been synthesized in good yields (76-89%). The effects of substitution on the fluorescent intensity and solubility of the molecules were examined with experimental techniques. The deprotonation properties of the prepared Schiff bases were examined, in DMSO, by titration of each of the ligands with TBAOH. We also studied the reverse protonation of the fluorophores using TFA. The structural and electronic properties of the neutral and the deprotonated forms of the fluorophores were also examined in the framework of DFT calculations. Also, the cytotoxicity of each of the compounds was tested against L929 fibroblasts and human lung cancer (small cell). Furthermore, the antimicrobial activity of each of the compounds was studied against both Gram-negative and Gram-positive bacterial and fungal species. In the final studies, the plasmid DNA interactions with the compounds were investigated with agarose gel electrophoresis. The thermal properties of all the prepared compounds were determined by thermal gravimetric analysis (TGA) and were found to be thermostable up to at least 335 degrees C.
DOI : 10.1016/j.jphotochem.2018.09.041
Anahtar Kelimeler : Coumarin-thiophene, Schiff bases, Effects of substituents, Photophysical properties, DFT calculations, Biological activity, article
Cilt: 368
ISSN: 1010-6030
Sınıflandırma :
19
Synthesis of novel photochromic methyl cyanoacetate-condensed fulgide derivatives
Dergi Makalesi

Dergi Makalesi
Kaynak :
DSpace Makaleler
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Bülent Ecevit Üniversitesi
Yazar(lar) :
Bülent Ecevit Üniversitesi
Konu :
Fulgides, Methyl cyanoacetate, Photochromism, Quantum efficiency
Yıl :
2007
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı Web Sitesi
 Piri Tam Metin Bulucu
Kaydet
New thermally irreversible photochromic methyl cyanoacetate-condensed fulgide derivatives were prepared and their photochromic properties were investigated. Coloured form of methyl cyanoacetate-condensed derivatives C-4(a-d) show large bathochromic shifts of their long wavelength absorption bands compared to the coloured form of corresponding fulgides Z-1(a-d). Solvent effects on the compound ZZ-4a and its ring-closed form C-4a were investigated. The polarity of the solvent caused a bathochromic shift of both coloured and uncoloured forms. © 2007 Elsevier B.V. All rights reserved.
DOI : 10.1016/j.jphotochem.2006.12.036
Anahtar Kelimeler : Fulgides, Methyl cyanoacetate, Photochromism, Quantum efficiency, article
Cilt: 188
Sayı: 02.Mar
ISSN: 1010-6030
Sınıflandırma :
20
Electron
Dergi Makalesi

Dergi Makalesi
Kaynak :
DSpace Makaleler
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier B.V.
Yazar(lar) :
Bülent Ecevit Üniversitesi
Konu :
Coordination compounds, Density functional theory, Hybrid materials, Perylene diimide, Ultrafast pump-probe
Yıl :
2019
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı Web Sitesi
 Piri Tam Metin Bulucu
Kaydet
To understand the influence of transition metal ion coordination on the properties and performance of the triads, the symmetric bridging ligand, 1,10-phenanthroline-perylene diimide-1,10-phenanthroline, 1,10-Phen-PDI-1,10-Phen (1) comprising four electron-donating 4-methoxyphenoxy bulky groups at bay-positions and its corresponding square-planar coordination compounds with dichloroplatinum(II), [{PtCl2}2-1] (2) and palladium(II) [{PdCl2}2-1] (3) were prepared in order to tune the photochemical and optical properties of these hybrid materials. These triads show strong electronic absorption bands attributed to the PDI and M(II)(1,10-Phen)Cl2 moieties in DMSO. UV–vis absorption spectra of the compounds were calculated using Time-Dependent Density Functional Theory (TDDFT) for the ground state optimized structures in DCM. Current results indicate that 2 has the lowest HOMO-LUMO gap (2.29 eV in DCM) among the investigated molecules. The energy and charge transfer processes with tailoring molecular structures are one of the important strategies for the design of future functional triads based on donor and acceptor moieties for hybrids optoelectronic devices. Thus, we studied linear absorption, fluorescence, and ultrafast transient absorption spectra measurements for the triads in DCM to investigate the impact of different functionalization strategies on the optical characteristics, photo-stability, and photo-induced charge-transfer (CT) processes. The observed ultrafast intramolecular charge transfer from donor units to acceptor part of 1–3 is related to fluorescence quenching and faster singlet state decay on transient absorption measurements. The intramolecular charge transfer mechanism was also compared with the unsymmetrical counterparts that were investigated previously. Symmetrical compounds exhibit faster charge transfer in comparison with the unsymmetrical compounds. © 2018 Elsevier B.V.
DOI : 10.1016/j.jphotochem.2018.12.019
Anahtar Kelimeler : Coordination compounds, Density functional theory, Hybrid materials, Perylene diimide, Ultrafast pump-probe, article
Cilt: 372
ISSN: 1010-6030
Sınıflandırma :
21
Synthesis of novel tetrazine based D-π-A organic dyes for photoelectrochemical and photocatalytic hydrogen evolution
Dergi Makalesi

Dergi Makalesi
Kaynak :
DSpace Makaleler
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier
Yazar(lar) :
Emre Aslan , Merve Karaman , Gizem Yanalak , Hakan Bilgili , Mustafa Can , Faruk Özel , Imren Hatay Patir
Konu :
Donor-Pi-Acceptor Dyes, Hydrogen Evolution, Dye Sensitization
Yıl :
2020
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı Web Sitesi
Kaydet
Two novel donor-pi-acceptor (D-pi-A) dyes, called as MK-2 and MK-8, are synthesized. Their structural, optical and electrochemical properties are investigated by NMR, absorption/photoluminescence spectroscopies and cyclic voltammetry techniques, respectively. Photocatalytic and photoelectrochemical hydrogen evolution properties of these D-pi-A dyes are explored by using triethanolamine (TEOA) as a sacrificial electron donor under anaerobic conditions and visible light irradiation with or without co-catalysts (Cu2WS4 and Pt) for the first time. Photoelectrochemical and photocatalytic hydrogen evolution reaction (HER) activities of these dyes are studied by using TiO2 coated FTO electrodes and powdered TiO2 (Degussa P25), respectively. Photoelectrochemical response of MK-2/TiO2 and MK-8/TiO2 are figured out in the order of 180 mu A cm(-1) and 80 A cm(-1). The photocatalytic hydrogen evolution amounts of MK-2/TiO2, MK-2/TiO2/Cu2WS4, MK-2/TiO2/Pt, MK-8/TiO2, MK-8/TiO2/Cu2WS4 and MK-8/TiO2/Pt are turned out to be 565, 920, 1828, 374, 522 and 1260 mu molg(-1) h(-1), respectively. Dye/TiO2 photocatalysts are displayed good stability in the both photochemical HER experiments. The alteration in the HER activities of MK-2 and MK-8 is explained by molecule structures of dyes. The proposed mechanism of photocatalytic hydrogen evolution is clarified by using electrochemical band levels of each constituent.
Anahtar Kelimeler : Donor-Pi-Acceptor Dyes, Hydrogen Evolution, Dye Sensitization, article
Cilt: 390
ISSN: 1010-6030
Sınıflandırma :
Kimya %73
Kataliz %97
22
A tetraoxacalix2arene2triazine based fluorogenic probe for the sensing of Fe3+: Computational and living–cell imaging applications
Dergi Makalesi

Dergi Makalesi
Kaynak :
DSpace Makaleler
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Elsevier B.V.
Yazar(lar) :
Şükriye Nihan Elmas Karuk , İbrahim Berk Günay , H.N. Genç , Duygu Aydın , Fatma Nur Arslan , Gökhan Sadi , İbrahim Yılmaz
Konu :
Density Functional Theory, Fluorescence Sensor, Iron, Living Cell, Tetraoxacalixarene
Yıl :
2020
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı Web Sitesi
Kaydet
Herein, we have reported a feasibility study of highly selective and sensitive fluorogenic chemosensor (probe TOCT) derived from tetraoxacalix [2] arene [2] triazine for Fe3+ sensing in aqueous media. The probe TOCT has been fabricated and verified by 1H–NMR, HR–LCMS,FT–IRand 13C–NMR. The sensing properties of probe TOCT toward various metal ions were confirmed by fluorescence titration study as well as competitive study. The intensity of probe TOCT reduced with the amount of Fe3+ when it was excited at 300 nm in CH3CN:H2O (95/5, v/v, pH = 7) media. The probe demonstrated a ‘turn–off’ response toward Fe3+, in the presence of possible competing ions. The detection limit value of probe TOCT for Fe3+ sensing was computed to be 12.5 nM. The possible molecular structure of complex between probe TOCT and Fe3+ was also proposed on the basis of HR–LCMS and FT–IR. The stoichiometry of TOCT–Fe3+ complex was identified to be 1:1 to the methodology of Job's plot. The binding ability was studied through the equation of Benesi–Hildebrand which was computed to be 8.90 × 104 M–1 for Fe3+. To support the intensity enhancement and quenching studies, we reported computational experiments based on the density functional theory (DFT). Moreover, a great potential has been detected for probe TOCT as a fluorescent chemosensor in biological applications to monitor Fe3+ in living cells. © 2020 Elsevier B.V.
Anahtar Kelimeler : Density Functional Theory, Fluorescence Sensor, Iron, Living Cell, Tetraoxacalixarene, article
Cilt: 403
ISSN: 1010-6030
Sınıflandırma :
23
Photocatalytic degradation of a textile azo dye, Sirius Gelb GC on TiO 2 or Ag-TiO 2 particles in the absence and presence of UV irradiation: The effects of some inorganic anions on the photocatalysis
Dergi Makalesi

Dergi Makalesi
Kaynak :
DSpace Makaleler
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Sivas Cumhuriyet Üniversitesi
Yazar(lar) :
Özkan A. , Özkan M.H. , Gürkan R. , Akçay M. , Sökmen M.
Konu :
Ag loaded-TiO 2, anions, Photocatalytic oxidation, Sirius Gelb GC, Titania
Yıl :
2004
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı Web Sitesi
 Piri Tam Metin Bulucu
Kaydet
The aqueous phase photocatalytic degradation of Sirius Gelb GC used in the textile industry, was investigated. In order to optimize the working pH, three different dye solutions were prepared at pH 3.5; 7.0 and 11.0. One hundred cubic centimeter portions of the solution were irradiated with a low pressure UV lamb in the absence and presence of catalysts TiO 2 or Ag loaded-TiO 2 . In all conditions, the samples withdrawn from the reactor were centrifuged and separated from the catalyst and degradation percentages were calculated from the measurement of the residual dye concentrations, spectrophotometrically. The optimum pH, which provides the best degradation ratio was found to be 3.5 for the dye. At the same pH, it was found that silver loaded catalyst is more effective than neat TiO 2 catalyst. The silver loading dramatically reduced the irradiation time from 20 min to 8 min for Sirius Gelb GC. However, the catalytical behavior of the both the catalysts was also investigated in heavy salt media such as simulated wastewater and in a river fluent. Pooled standard deviation (S pooled ) of the repeated measurements in all conditions is 0.615 for N=47 and 38 degrees of freedom. Confidence limit of the method is 98.8±0.2 in 95% confidence level. © 2004 Elsevier B.V. All rights reserved.
DOI : 10.1016/S1010-6030(03)00426-X
Anahtar Kelimeler : Ag loaded-TiO 2 and anions, Photocatalytic oxidation, Sirius Gelb GC, Titania, article

ISSN: 1010-6030
Sınıflandırma :
Kimya %97
Kataliz %87
24
A study on photophysical properties of some Vitamin K3 derivatives
Dergi Makalesi

Dergi Makalesi
Kaynak :
DSpace Makaleler
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Ege Universitesi
Yazar(lar) :
Hakli O. , Karapire C. , Posokhov Y. , Içli S.
Konu :
Concentrated sun light, Photodegradation, Photophysical property, Surfactant, Vitamin K3
Yıl :
2004
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı Web Sitesi
Kaydet
Photophysical properties of menadione sodium bisulfite (MSB), menadione nicotinamide bisulfite (MNB) and menadione dimethylpyrimidinol bisulfite (MPB) were studied in their aqueous solutions. They are oil-soluble vitamins and not naturally fluorescent, however, it is possible to gain fluorescent signal by the use of phosphate buffer solutions containing sodium dodecyl sulfate (SDS) at optimum concentration. The quantum yields of fluorescence emission, ? f, were measured as ~10-4, 0.0085 and 0.053 for MSB, MNB, MPB, respectively. Fluorescence quenching with Co2+ ions yielded the quenching rates of 1.7×109, 4.6×1010, and 1.5×1010 M-1 s-1 for MSB, MNB and MPB, respectively. Calculated Gibbs free energy (? G) values (?-5 kcal/mol) of the compounds suggest that electron transfer could be the reason of quenching with Co2+ ions. Studied derivatives were found to give two electrons. Equilibrium constants (Keq) derived from ? G values pointed out strong association between the pairs of MSB, MNB and MPB complexes. They were irradiated by using not only artificial Xe lamp of fluorescence spectrophotometer, but also by using direct and concentrated sunlight and degradation (%), rate constant (kp) and half-lives (t1/2) were compared. Photodegradation (%) of Vitamin K3 derivatives varied depending on the irradiation source. Photostability tests pointed out MPB as the most stable derivative. © 2004 Elsevier B.V. All rights reserved.
Anahtar Kelimeler : Concentrated sun light, Photodegradation, Photophysical property, Surfactant, Vitamin K3, article
Cilt: 162
Sayı: 02.Mar
ISSN: 1010-6030
Sınıflandırma :
Kimya %100
25
Solar photocalytic disinfection of a group of bacteria and fungi aqueous suspensions with Tio2, ZnO and sahara desert dust
Dergi Makalesi

Dergi Makalesi
Kaynak :
DSpace Makaleler
Dergi:
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı:
Ege Universitesi
Yazar(lar) :
Seven O. , Dindar B. , Aydemir S. , Metin D. , Ozinel M.A. , Icli S.
Konu :
Aspergillius niger, Candida albicans, Escherichia coli, Photocatalytic disinfection, Pseudomonas aeruginosa, Saccharomyces cerevisiae, Sahara desert dust, Staphylococcus aureus, TiO2, ZnO
Yıl :
2004
Journal of Photochemistry and Photobiology A: Chemistry
Yayıncı Web Sitesi
Kaydet
This photocatalytic method was aimed to destroy bacteria, to prevent fungi in some industrial products and to create desirable hygienic medium under solar irradiation. The efficiencies of disinfection with the photoactive metal oxides and the Sahara desert dust was investigated. We have studied photocatalytic disinfection of two-groups of microorganisms which are known as bacteria and fungus in pathogenic-organisms: Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, Saccharomyces cerevisiae, Candida albicans, Aspergillius niger. Aqueous suspension of the microorganisms (1.105 cfu/ml), in the presence of TiO2, ZnO and Sahara desert dust were irradiated with a 400 W sodium lamp for various time periods in order to simulate solar radiation. Minimum catalyst concentration was used as 0.01 mg/ml. Sahara desert dust that contain some photoactive/inactive metal oxides (ZnO, Fe2O3, etc.) and some organics, is known as fertilizer of bioactivities in nature. In accordance with, no microbicidal effect of Sahara dust. Efficient microbicidal effects of TiO2 and ZnO were detected under sodium light irradiations. Except for A. niger, all selected bacteria and fungus were disinfected in a short period by using 400 W sodium lamp in the presence of photocatalysts. Three strains of bacteria were destroyed in 40 min, two strains of fungi were also destroyed in 120 min at the same conditions. Photocatalytical method is an advantageous and an alternative one in comparison with former literatures. © 2004 Elsevier B.V. All right reserved.
Anahtar Kelimeler : Aspergillius niger, Candida albicans, Escherichia coli, Photocatalytic disinfection, Pseudomonas aeruginosa, Saccharomyces cerevisiae, Sahara desert dust, Staphylococcus aureus, TiO2, ZnO, article
Cilt: 165
Sayı: 01.Mar
ISSN: 1010-6030
Sınıflandırma :
26
Spectral properties and complex formation with Cu2+ ions of 2-and 4-(N-arylimino)-quinolines
Dergi Makalesi

Dergi Makalesi
Kaynak :
DSpace Makaleler
Dergi:
Journal of Photochemistry and Photobiology A-Chemistry
Yayıncı:
Elsevier Science Sa
Yazar(lar) :
Posokhov , Y , Kus , M , Biner , H , Gumus , MK , Tugcu , FT , Aydemir , E , Kaban , S , Icli , S
Konu :
spectral-fluorescence properties, fluorescence quenching, complex formation
Yıl :
2004
Journal of Photochemistry and Photobiology A-Chemistry
Yayıncı Web Sitesi
Kaydet
The spectral-fluorescent properties of substituted 2- and 4-(N-arylimino)quinolines have been investigated in solvents of different polarity and proton donating ability, and in immobilized phases of PVC films and sol-gel matrix. The effect of the solvent on spectral characteristics has been estimated. It has been shown that, despite the possibility of quenching process linked with intramolecular motions with great amplitude of the non-fixed azomethine fragment, the low fluorescence quantum yield of the studied compounds in polar solvents and in immobilized phases is caused mainly by the quenching process which is not linked directly with significant changes in molecular geometry. The complexation process of the studied ortho-hydroxyphenols with Cu2+ ion caused strong changes in their absorption spectra. Among the studied compounds, 4-chloro-2-[(quinolin-2-yl-methylene)]-amino-phenol has shown better selectivity and sensitivity towards Cu2+. This compound could be suggested as a prospective reagent for spectroscopic determination Of Cu2+ trace amounts (<10(-4) M), e.g. for copper determination in Al-based alloys. (C) 2004 Elsevier B.V. All rights reserved.
Anahtar Kelimeler : spectral-fluorescence properties, fluorescence quenching, complex formation, article
Cilt: 161
Sayı: 02.Mar
ISSN: 1010-6030
27
Heterogeneous photo Fenton-like oxidation of Procion Red MX-5B using walnut shell based green catalysts
Dergi Makalesi

Dergi Makalesi
Kaynak :
DSpace Makaleler
Dergi:
Journal of Photochemistry and Photobiology A-Chemistry
Yayıncı:
Elsevier Science Sa
Yazar(lar) :
Palas Burcu , Ersoz Gulin , Atalay Suheyda
Konu :
Walnut shell, Azo dye, Photodegradation
Yıl :
2016
Journal of Photochemistry and Photobiology A-Chemistry
Yayıncı Web Sitesi
Kaydet
The walnut shell based photo Fenton-like catalysts were prepared and their performances in the removal of Procion Red MX-5B in aqueous solution were investigated. The influence of several operating parameters including the catalyst loading, the initial hydrogen peroxide concentration ([H2O2](o)), pH and power of UV light on the degradation and the decolorization of Procion Red MX-5B were studied. The optimum reaction conditions obtained at room temperature were 2 mM of the initial hydrogen peroxide concentration, 0.25 g/l of catalyst loading and 3 of the initial pH for an initial dye concentration of 100 ppm. Under these conditions 50% degradation and 88.3% decolorization were achieved. Iron leaching in the treated dye solution was determined as 1.98 ppm which was below the European Union limits. The toxicity which was evaluated in terms of relative root growth inhibition rate of Lepidium sativum roots was 0.6%. (C) 2016 Elsevier B.V. All rights reserved.
Anahtar Kelimeler : Walnut shell, Azo dye, Photodegradation, article
Cilt: 324
ISSN: 1010-6030
Sınıflandırma :
Kimya %38
Kataliz %99
28
Photosynthesis of rose oxide by concentrated sunlight in the absence of singlet oxygen
Dergi Makalesi

Dergi Makalesi
Kaynak :
DSpace Makaleler
Dergi:
Journal of Photochemistry and Photobiology A-Chemistry
Yayıncı:
Elsevier Science Sa
Yazar(lar) :
Dincalp , H , Icli , S
Konu :
super oxide anion radical, perylene diimide, naphthalene diimide, solar concentrator
Yıl :
2001
Journal of Photochemistry and Photobiology A-Chemistry
Yayıncı Web Sitesi
Kaydet
Rose oxide was photosynthesized in aerated acetonitrile solutions from citronellol via aromatic diimide (dehydroabietyl perylene diimide and n-butyl naphthalene diimide (BUNAP)) singlet photosensitizers under sodium light (0.2-0.4 sun) and concentrated sun light (90-100 sun). The yield of formation of rose oxide is high by concentrated sun light, with respect to sodium light irradiation. It was shown that, (I) super oxide anion radical results in the production of rose oxide from citronellol as seen previously with singlet oxygen; (II) photo-and thermal-stable aromatic diimides are capable of producing rose oxide in high yield by 100-fold concentrated sun light conditions. The addition of cupric and ferric ions to acetonitrile solutions lowered the yield of rose oxide formation. (C) 2001 Elsevier Science B.V. All rights reserved.
Anahtar Kelimeler : super oxide anion radical, perylene diimide, naphthalene diimide, solar concentrator, article
Cilt: 141
Sayı: 02.Mar
ISSN: 1010-6030
Sınıflandırma :
Kimya %100
Kataliz %49

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