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Wilczewska P, Ona AEN, Bielicka-Giełdoń A, Malankowska A, Tabaka K, Ryl J, Pniewski F, Siedlecka EM. Application of BiOClnBrm photocatalyst to cytostatic drugs removal from water; mechanism and toxicity assessment. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2020.117601] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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3
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Chung WJ, Nguyen DD, Bui XT, An SW, Banu JR, Lee SM, Kim SS, Moon DH, Jeon BH, Chang SW. A magnetically separable and recyclable Ag-supported magnetic TiO 2 composite catalyst: Fabrication, characterization, and photocatalytic activity. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2018; 213:541-548. [PMID: 29478848 DOI: 10.1016/j.jenvman.2018.02.064] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2017] [Revised: 02/12/2018] [Accepted: 02/16/2018] [Indexed: 05/24/2023]
Abstract
In this study, a magnetically separable, highly active, and recyclable photocatalyst was synthesized by physico-chemical incorporation of Ag, TiO2, and Fe3O4 into one structure. The physical and chemical properties of the catalysts were evaluated by X-ray diffraction, X-ray fluorescence spectrometry, scanning electron microscopy, field emission transmission electron microscopy, energy dispersive X-ray spectroscopy, and diffuse reflectance spectroscopy. The Ag-supported magnetic TiO2 composite demonstrated desirable properties and features such as a narrow band gap of 1.163 eV, modifiable structure, and high degradation efficiency. The activity and durability of the synthesized photocatalyst in the degradation of methyl orange (MO) in aqueous solutions under visible light irradiation and different experimental conditions were evaluated and compared to those of commercial TiO2 and Ag/TiO2 composites. It was found that the synthesized composite showed a much higher MO photodegradation efficiency than the other composites under visible light irradiation. Moreover, it exhibited a high photocatalytic activity and was recoverable and durable; its photocatalytic efficiency in MO removal was consistently higher than 93.1% after five reuses without any evident signs of deactivation. Thus, the developed photocatalyst is a very promising material for practical applications in environmental pollution remediation.
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Affiliation(s)
- Woo Jin Chung
- Department of Environmental Energy Engineering, Kyonggi University, 94 San, Iui-dong, Youngtong-gu, Suwon-si, Gyeonggi-do, 16227, Republic of Korea
| | - Dinh Duc Nguyen
- Department of Environmental Energy Engineering, Kyonggi University, 94 San, Iui-dong, Youngtong-gu, Suwon-si, Gyeonggi-do, 16227, Republic of Korea.
| | - Xuan Thanh Bui
- Faculty of Environment and Natural Resources, University of Technology, Vietnam National University, Ho Chi Minh City, Vietnam
| | - Sang Woo An
- Wizinnotek Co. Ltd, 452 Nohae-ro, Nowon-gu, Seoul, 01762, Republic of Korea
| | - J Rajesh Banu
- Department of Civil Engineering, Regional Campus of Anna University, Tirunelveli 627007, Tamil Nadu, India
| | - Sang Moon Lee
- Department of Environmental Energy Engineering, Kyonggi University, 94 San, Iui-dong, Youngtong-gu, Suwon-si, Gyeonggi-do, 16227, Republic of Korea
| | - Sung Su Kim
- Department of Environmental Energy Engineering, Kyonggi University, 94 San, Iui-dong, Youngtong-gu, Suwon-si, Gyeonggi-do, 16227, Republic of Korea
| | - Dea Hyun Moon
- Department of Environmental Energy Engineering, Kyonggi University, 94 San, Iui-dong, Youngtong-gu, Suwon-si, Gyeonggi-do, 16227, Republic of Korea
| | - Byong Hun Jeon
- Department of Earth Resources and Environmental Engineering, Hanyang University, Seoul 04763, Republic of Korea
| | - Soon Woong Chang
- Department of Environmental Energy Engineering, Kyonggi University, 94 San, Iui-dong, Youngtong-gu, Suwon-si, Gyeonggi-do, 16227, Republic of Korea.
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Koltsakidou Α, Antonopoulou M, Εvgenidou Ε, Konstantinou I, Giannakas AE, Papadaki M, Bikiaris D, Lambropoulou DA. Photocatalytical removal of fluorouracil using TiO 2-P25 and N/S doped TiO 2 catalysts: A kinetic and mechanistic study. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 578:257-267. [PMID: 27856058 DOI: 10.1016/j.scitotenv.2016.08.208] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2016] [Revised: 08/30/2016] [Accepted: 08/30/2016] [Indexed: 06/06/2023]
Abstract
In the present study, the photocatalytic activity of TiO2-based photocatalysts toward degradation and mineralization of the anti-cancer drug 5-fluorouracil (5-FU) in aqueous phase was investigated under simulated solar and visible irradiation. Commercial TiO2 (P25) and N/S-doped TiO2 catalysts synthesized by a simple sol-gel method were used as photocatalysts. TiO2 P-25 was found to be the most photoactive catalyst for the removal of 5-FU, under simulated solar irradiation. Among N/S-doped TiO2 catalysts, the one with molar Ti:N/S ratio equal to 0.5 was the most efficient under simulated solar irradiation. In contrast, under visible irradiation the catalyst with equimolar Ti:N/S ratio showed the highest performance for the removal of 5-FU. Scavenging experiments revealed that HO radicals and h+ were the major reactive species mediating photocatalytic degradation of 5-FU using TiO2 P-25 and N/S-doped TiO2 catalysts, under simulated solar irradiation. On the other hand, the essential contribution of 1O2 and O2- in the degradation of 5-FU under visible light was proved. The transformation products (TPs) of 5-FU, were identified by LC-MS-TOF suggesting that defluorination followed by hydroxylation and oxidation are the main transformation pathways, under all the studied photocatalytic systems.
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Affiliation(s)
- Α Koltsakidou
- Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| | - M Antonopoulou
- Department of Environmental and Natural Resources Management, University of Patras, 30100 Agrinio, Greece
| | - Ε Εvgenidou
- Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| | - I Konstantinou
- Department of Chemistry, University of Ioannina, 45110 Ioannina, Greece
| | - A E Giannakas
- Department of Environmental and Natural Resources Management, University of Patras, 30100 Agrinio, Greece
| | - M Papadaki
- Department of Environmental and Natural Resources Management, University of Patras, 30100 Agrinio, Greece
| | - D Bikiaris
- Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| | - D A Lambropoulou
- Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
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Lalia BS, Garlisi C, Palmisano G, Hashaikeh R. Photocatalytic activity of an electrophoretically deposited composite titanium dioxide membrane using carbon cloth as a conducting substrate. RSC Adv 2016. [DOI: 10.1039/c6ra07390e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This is the first report where a polymer, namely poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF–HFP), has been used as a binder together with the electrophoretic deposition process.
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Affiliation(s)
- Boor Singh Lalia
- Institute Center for Water and Environment (iWater)
- Masdar Institute of Science and Technology
- Abu Dhabi
- United Arab Emirates
| | - Corrado Garlisi
- Institute Center for Water and Environment (iWater)
- Masdar Institute of Science and Technology
- Abu Dhabi
- United Arab Emirates
| | - Giovanni Palmisano
- Institute Center for Water and Environment (iWater)
- Masdar Institute of Science and Technology
- Abu Dhabi
- United Arab Emirates
| | - Raed Hashaikeh
- Institute Center for Water and Environment (iWater)
- Masdar Institute of Science and Technology
- Abu Dhabi
- United Arab Emirates
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6
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Kinetics and mechanism of thymine degradation by TiO2 photocatalysis. CHINESE JOURNAL OF CATALYSIS 2015. [DOI: 10.1016/s1872-2067(15)60967-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Improved photocatalytic hydrogen production of ZnO/ZnS based photocatalysts by Ce doping. J Taiwan Inst Chem Eng 2015. [DOI: 10.1016/j.jtice.2015.04.024] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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8
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Photocatalytic and photoelectrocatalytic degradation of small biological compounds at TiO2 photoanode: A case study of nucleotide bases. Catal Today 2015. [DOI: 10.1016/j.cattod.2014.04.029] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Laptenok SP, Bouzhir-Sima L, Lambry JC, Myllykallio H, Liebl U, Vos MH. Ultrafast real-time visualization of active site flexibility of flavoenzyme thymidylate synthase ThyX. Proc Natl Acad Sci U S A 2013; 110:8924-9. [PMID: 23671075 PMCID: PMC3670337 DOI: 10.1073/pnas.1218729110] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
In many bacteria the flavoenzyme thymidylate synthase ThyX produces the DNA nucleotide deoxythymidine monophosphate from dUMP, using methylenetetrahydrofolate as carbon donor and NADPH as hydride donor. Because all three substrates bind in close proximity to the catalytic flavin adenine dinucleotide group, substantial flexibility of the ThyX active site has been hypothesized. Using femtosecond time-resolved fluorescence spectroscopy, we have studied the conformational heterogeneity and the conformational interconversion dynamics in real time in ThyX from the hyperthermophilic bacterium Thermotoga maritima. The dynamics of electron transfer to excited flavin adenine dinucleotide from a neighboring tyrosine residue are used as a sensitive probe of the functional dynamics of the active site. The fluorescence decay spanned a full three orders of magnitude, demonstrating a very wide range of conformations. In particular, at physiological temperatures, multiple angstrom cofactor-residue displacements occur on the picoseconds timescale. These experimental findings are supported by molecular dynamics simulations. Binding of the dUMP substrate abolishes this flexibility and stabilizes the active site in a configuration where dUMP closely interacts with the flavin cofactor and very efficiently quenches fluorescence itself. Our results indicate a dynamic selected-fit mechanism where binding of the first substrate dUMP at high temperature stabilizes the enzyme in a configuration favorable for interaction with the second substrate NADPH, and more generally have important implications for the role of active site flexibility in enzymes interacting with multiple poly-atom substrates and products. Moreover, our data provide the basis for exploring the effect of inhibitor molecules on the active site dynamics of ThyX and other multisubstrate flavoenzymes.
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Affiliation(s)
- Sergey P. Laptenok
- Laboratory for Optics and Biosciences, Centre National de la Recherche Scientifique Ecole Polytechnique, 91128 Palaiseau, France; and
- Institut National de la Santé et de la Recherche Médicale U696, 91128 Palaiseau, France
| | - Latifa Bouzhir-Sima
- Laboratory for Optics and Biosciences, Centre National de la Recherche Scientifique Ecole Polytechnique, 91128 Palaiseau, France; and
- Institut National de la Santé et de la Recherche Médicale U696, 91128 Palaiseau, France
| | - Jean-Christophe Lambry
- Laboratory for Optics and Biosciences, Centre National de la Recherche Scientifique Ecole Polytechnique, 91128 Palaiseau, France; and
- Institut National de la Santé et de la Recherche Médicale U696, 91128 Palaiseau, France
| | - Hannu Myllykallio
- Laboratory for Optics and Biosciences, Centre National de la Recherche Scientifique Ecole Polytechnique, 91128 Palaiseau, France; and
- Institut National de la Santé et de la Recherche Médicale U696, 91128 Palaiseau, France
| | - Ursula Liebl
- Laboratory for Optics and Biosciences, Centre National de la Recherche Scientifique Ecole Polytechnique, 91128 Palaiseau, France; and
- Institut National de la Santé et de la Recherche Médicale U696, 91128 Palaiseau, France
| | - Marten H. Vos
- Laboratory for Optics and Biosciences, Centre National de la Recherche Scientifique Ecole Polytechnique, 91128 Palaiseau, France; and
- Institut National de la Santé et de la Recherche Médicale U696, 91128 Palaiseau, France
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Lee HI, Kim JH, Lee HS, Lee WD. Purification of Toxic Compounds in Water and Treatment of Polymeric Materials. ACTA ACUST UNITED AC 2010. [DOI: 10.1007/978-0-387-48444-0_15] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
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Campanella L, Costanza C. Photosensor of environmental persistence for chemical risk assessment. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2009; 72:261-272. [PMID: 18786725 DOI: 10.1016/j.ecoenv.2005.06.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2004] [Revised: 06/20/2005] [Accepted: 06/22/2005] [Indexed: 05/26/2023]
Abstract
A photosensor array for chemical risk assessment is proposed. It is based on the evaluation of thermodynamic stability, kinetic inertness, of ecopermanence and of radical as species to maintain degradative conditions. It is applied to different classes of pollutants (drugs, dyes, pesticide, surfactants).
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Affiliation(s)
- Luigi Campanella
- Department of Chemistry, University of Rome "La Sapienza", Piazzale Aldo Moro 5, 00185 Rome, Italy.
| | - Cecilia Costanza
- Department of Chemistry, University of Rome "La Sapienza", Piazzale Aldo Moro 5, 00185 Rome, Italy
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Kathiravan A, Renganathan R. An investigation on electron transfer quenching of zinc(II) meso-tetraphenylporphyrin (ZnTPP) by colloidal TiO(2). SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2008; 71:1106-1109. [PMID: 18424228 DOI: 10.1016/j.saa.2008.03.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2007] [Revised: 03/03/2008] [Accepted: 03/03/2008] [Indexed: 05/26/2023]
Abstract
The interaction of zinc(II) meso-tetraphenylporphyrin (ZnTPP) with colloidal TiO(2) was studied by absorption, steady state and time-resolved fluorescence spectroscopy. The quenching was found to obey the Stern-Volmer equation and the corresponding Stern-Volmer plots were linear in the range of quencher concentration used 0-5 x 10(-4)M. The bimolecular quenching rate constants (k(q)) were 20.5 x 10(10)M(-1)s(-1) (steady-state) and 2.85 x 10(10)M(-1)s(-1) (time resolved). The quenching process is suggested to involve electron transfer from the ZnTPP to TiO(2) considering the experimental evidences obtained.
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Affiliation(s)
- A Kathiravan
- School of Chemistry, Bharathidasan University, Tiruchirappalli 620024, Tamil Nadu, India
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Lin YC, Lin CH. Catalytic and photocatalytic degradation of ozone via utilization of controllable nano-Ag modified on TiO2. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/ep.10305] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Ghosh A, Joy A, Schuster GB, Douki T, Cadet J. Selective one-electron oxidation of duplex DNA oligomers: reaction at thymines. Org Biomol Chem 2008; 6:916-28. [PMID: 18292885 DOI: 10.1039/b717437c] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The one-electron oxidation of duplex DNA generates a nucleobase radical cation (electron "hole") that migrates long distances by a hopping mechanism. The radical cation reacts irreversibly with H2O or O2 to form oxidation products (damaged bases). In normal DNA (containing the four common DNA bases), reaction occurs most frequently at guanine. However, in DNA duplexes that do not contain guanine (i.e., those comprised exclusively of A/T base pairs), we discovered that reaction occurs primarily at thymine and gives products resulting from oxidation of the T-C5 methyl group and from addition to its C5-C6 double bond. This surprising result shows that it is the relative reactivity, not the stability, of a nucleobase radical cation that determines the nature of the products formed from oxidation of DNA. A mechanism for reaction is proposed whereby a thymine radical cation may either lose a proton from its methyl group or H2O/O2 may add across its double bond. In the latter case, addition may initiate a tandem reaction that converts both thymines of a TT step to oxidation products.
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Affiliation(s)
- Avik Ghosh
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332, USA
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Tran H, Scott J, Chiang K, Amal R. Clarifying the role of silver deposits on titania for the photocatalytic mineralisation of organic compounds. J Photochem Photobiol A Chem 2006. [DOI: 10.1016/j.jphotochem.2006.02.018] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Campanella L, Battilotti M, Costanza C. Studies on Simulated Ageing of Paper by Photochemical Degradation. ACTA ACUST UNITED AC 2005; 95:727-40. [PMID: 16398338 DOI: 10.1002/adic.200590087] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The study of the ageing of two paper types was performed on monitoring it during a simulated process by means of the measure of the photocatalytic degradation of the paper cellulose. Such evaluation was possible due to the combined responses of a photosensor based on titanium dioxide in suspension, of an enzymatic biosensor based on superoxide dismutase (SOD), of a specific conductivity sensor and of an enzymatic biosensor based on glucose oxidase.
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Affiliation(s)
- Luigi Campanella
- Department of Chemistry, University of Rome La Sapienza, P.le Aldo Moro 5, 00185 Rome, Italy.
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Qourzal S, Tamimi M, Assabbane A, Ait-Ichou Y. Photocatalytic degradation and adsorption of 2-naphthol on suspended TiO2 surface in a dynamic reactor. J Colloid Interface Sci 2005; 286:621-6. [PMID: 15897080 DOI: 10.1016/j.jcis.2005.01.046] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2004] [Accepted: 01/20/2005] [Indexed: 11/22/2022]
Abstract
The photocatalytic oxidation of 2-naphthol has been investigated at room temperature in a dynamic photoreactor with system UV/O2 (air) and aqueous suspension of titanium dioxide TiO2 irradiated under a variety of conditions. The kinetics of disappearance of pollutant were affected by several operating parameters such as TiO2 mass, concentration of the substrate and reaction pH. The experiments were measured by high performance liquid chromatography. A Langmuir-Hinshelwood model was found to be accurate for photocatalytic degradation and indicates that adsorption of the solute on the surface of semiconductor particles plays a role in photocatalytic reaction.
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Affiliation(s)
- Samir Qourzal
- Labo. Chimie-Physique, Equipe de Photocatalyse et Environnement, Département de Chimie, Faculté des Sciences, Université Ibn Zohr, B.P. 8106 Cité Dakhla, Agadir, Morocco
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Use of coaxial photocatalytic reactor (CAPHORE) in the TiO2 photo-assisted treatment of mixed E. coli and Bacillus sp. and bacterial community present in wastewater. Catal Today 2005. [DOI: 10.1016/j.cattod.2005.03.022] [Citation(s) in RCA: 114] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Hameed A, Gondal M, Yamani Z. Effect of transition metal doping on photocatalytic activity of WO3 for water splitting under laser illumination: role of 3d-orbitals. CATAL COMMUN 2004. [DOI: 10.1016/j.catcom.2004.09.002] [Citation(s) in RCA: 107] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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Lee HS, Hur T, Kim S, Lee HI. Influences of Electron Scavenger and Conduction Band Position of Photocatalyst on the Degradation of a Pyrimidine Derivative. JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 2004. [DOI: 10.1252/jcej.37.174] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Han-Su Lee
- School of Chemical Engineering and Research Center for Energy Conversion and Storage, Seoul National University
| | - Tak Hur
- School of Chemical Engineering and Research Center for Energy Conversion and Storage, Seoul National University
| | | | - Ho-In Lee
- School of Chemical Engineering and Research Center for Energy Conversion and Storage, Seoul National University
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Effects of pH and surface modification of TiO2 with SiOx on the photocatalytic degradation of a pyrimidine derivative. Catal Today 2003. [DOI: 10.1016/s0920-5861(03)00271-2] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Ricci A, Chrétien MN, Maretti L, Scaiano JC. TiO2-promoted mineralization of organic sunscreens in water suspension and sodium dodecyl sulfate micelles. Photochem Photobiol Sci 2003; 2:487-92. [PMID: 12803070 DOI: 10.1039/b212815b] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The photostability of the widely used UVB sunscreen agents 2'-ethylhexyl-2-cyano-3-phenylcinnamate (1), 2-hydroxy-4-methoxybenzophenone (2), octyl salicilate (3), and 2'-ethylhexyl-4-methoxycinnamate (4) has been investigated under UVA irradiation in the absence and presence of TiO2, an inorganic filter commonly employed in combination with organic filters in sunscreen preparations. In the absence of TiO2, 1-3 are photostable and 4 undergoes the expected E-Z isomerization; the presence of TiO2 caused mineralization of the organic filters and, surprisingly, the process is noticeably faster in the presence of surfactant than in sunscreen and water suspensions. The results indicate that in water suspension, mineralization is likely to occur on or near the TiO2 particle surface; when the organic sunscreens are segregated in the micelle core, reactive radicals, produced during TiO2-promoted degradation of the micellar system, may participate in sunscreen degradation. In addition, a pre-fluorescent probe for carbon-centered radical detection, 4-(3-hydroxy-2-methyl-4-quinolineoxy)-2,2,6,6-tetramethylpiperidine-1-oxyl free radical or QT (5), was employed to demonstrate that carbon-centered radicals are evolved during micelle degradation and may participate in the mineralization of sunscreens.
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Affiliation(s)
- Andrea Ricci
- Department of Chemistry, Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie, Ottawa, Canada K1N 6N5
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Vamathevan V, Amal R, Beydoun D, Low G, McEvoy S. Photocatalytic oxidation of organics in water using pure and silver-modified titanium dioxide particles. J Photochem Photobiol A Chem 2002. [DOI: 10.1016/s1010-6030(02)00049-7] [Citation(s) in RCA: 255] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Cosa G, Chrétien MN, Galletero MS, Fornés V, García H, Scaiano JC. Photocatalytic Activity of a Multicomponent System Assembled within Zeolites: Case of 2,4,6-Triphenylpyrylium or Ruthenium Tris(bipyridyl) Photosensitizers and Titanium Dioxide Relays within Zeolite Y. J Phys Chem B 2002. [DOI: 10.1021/jp012163v] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Gonzalo Cosa
- Department of Chemistry, Center for Catalysis Research and Innovation, University of Ottawa, Ottawa K1N 6N5, Canada, and Instituto de Tecnología Química, CSIC-UPV, Universidad Politécnica de Valencia, Apartado 22012, 46071-Valencia, Spain
| | - Michelle N. Chrétien
- Department of Chemistry, Center for Catalysis Research and Innovation, University of Ottawa, Ottawa K1N 6N5, Canada, and Instituto de Tecnología Química, CSIC-UPV, Universidad Politécnica de Valencia, Apartado 22012, 46071-Valencia, Spain
| | - María S. Galletero
- Department of Chemistry, Center for Catalysis Research and Innovation, University of Ottawa, Ottawa K1N 6N5, Canada, and Instituto de Tecnología Química, CSIC-UPV, Universidad Politécnica de Valencia, Apartado 22012, 46071-Valencia, Spain
| | - Vicente Fornés
- Department of Chemistry, Center for Catalysis Research and Innovation, University of Ottawa, Ottawa K1N 6N5, Canada, and Instituto de Tecnología Química, CSIC-UPV, Universidad Politécnica de Valencia, Apartado 22012, 46071-Valencia, Spain
| | - Hermenegildo García
- Department of Chemistry, Center for Catalysis Research and Innovation, University of Ottawa, Ottawa K1N 6N5, Canada, and Instituto de Tecnología Química, CSIC-UPV, Universidad Politécnica de Valencia, Apartado 22012, 46071-Valencia, Spain
| | - J. C. Scaiano
- Department of Chemistry, Center for Catalysis Research and Innovation, University of Ottawa, Ottawa K1N 6N5, Canada, and Instituto de Tecnología Química, CSIC-UPV, Universidad Politécnica de Valencia, Apartado 22012, 46071-Valencia, Spain
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Cosa G, Galletero MS, Fernández L, Márquez F, García H, Scaiano JC. Tuning the photocatalytic activity of titanium dioxide by encapsulation inside zeolites exemplified by the cases of thianthrene photooxygenation and horseradish peroxidase photodeactivation. NEW J CHEM 2002. [DOI: 10.1039/b201397e] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Hancock-Chen T, Scaiano JC. Enzyme inactivation by TiO2 photosensitization. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. B, BIOLOGY 2000; 57:193-6. [PMID: 11154086 DOI: 10.1016/s1011-1344(00)00104-4] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The enzyme horseradish peroxidase is extensively inactivated by UVA exposure in the presence of TiO2, a common ingredient of sunscreens and cosmetics. The effect is attributed to the generation of reactive oxygen species, as indicated by the inactivation enhancement observed in the presence of air.
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Affiliation(s)
- T Hancock-Chen
- Department of Chemistry, University of Ottawa, Ont., Canada
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A study on the photocatalytic reactions of TiO2 with certain pyrimidine bases: effects of dopants (Fe3+) and calcination. ACTA ACUST UNITED AC 2000. [DOI: 10.1016/s1381-1169(99)00246-0] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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28
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Jaussaud C, Paı̈ssé O, Faure R. Photocatalysed degradation of uracil in aqueous titanium dioxide suspensions: mechanisms, pH and cadmium chloride effects. J Photochem Photobiol A Chem 2000. [DOI: 10.1016/s1010-6030(99)00212-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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