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Kuranov D, Platonov V, Khmelevsky N, Bozhev I, Maksimov S, Rumyantseva M, Krivetskiy V. Effect of Nb(V) doping on the Structure and Oxygen Chemisorption on Nanocrystalline TiO
2. ChemistrySelect 2022. [DOI: 10.1002/slct.202202644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Dmitry Kuranov
- Chemistry Department Moscow State University Moscow 119991 Russia
| | - Vadim Platonov
- Chemistry Department Moscow State University Moscow 119991 Russia
| | | | - Ivan Bozhev
- Quantum technology centre Moscow State University Moscow 119991 Russia
- Faculty of Physics Moscow State University Moscow 119991 Russia
| | - Sergey Maksimov
- Chemistry Department Moscow State University Moscow 119991 Russia
| | | | - Valeriy Krivetskiy
- Chemistry Department Moscow State University Moscow 119991 Russia
- Scientific-Manufacturing Complex «Technological Centre» Zelenograd Moscow 119991 Russia
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2
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Synergistic Correlation in the Colloidal Properties of TiO2 Nanoparticles and Its Impact on the Photocatalytic Activity. INORGANICS 2022. [DOI: 10.3390/inorganics10090125] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
In this work, the relationship between the photodegradation rate of methylene blue (MB) and the effective surface charge of titania nanoparticles (TiO2 NPs) in an aqueous solution is addressed. Colloidal dispersions were prepared from TiO2 NPs (4–10 nm) for the heterogenous photocatalysis test. The dispersion properties such as pH, hydrodynamic diameter, zeta potential, and isoelectric point were studied. Acidic TiO2 dispersions (pH = 3.6–4.0) with a positive zeta potential and smaller hydrodynamic diameter exhibit larger colloidal stability and pseudo-first-order kinetics for the degradation of MB. The largest rate constant (5 × 10−2 min−1) corresponded to a conversion of 98% within 75 min under UV light. This enhanced rate is a synergic effect between the surface area, charge, and optimal hydrodynamic diameter of TiO2 NPs. A linear correlation between the calculated values for the absorption cross-section and normalized rate constant was found for the systems under study. It was observed that an eventual increase in the pH (4–5.5) reduces the effective surface charge and dispersion stability, causing a decrease in the rate constants of one order of magnitude (10−3 min−1) for TiO2 agglomerates with a larger hydrodynamic diameter (300–850 nm).
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3
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Akhtar T, Nasir H, Sitara E, Bukhari SAB, Ullah S, Iqbal RMA. Efficient photocatalytic degradation of nitrobenzene by copper-doped TiO 2: kinetic study, degradation pathway, and mechanism. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:49925-49936. [PMID: 35220541 DOI: 10.1007/s11356-022-19422-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Accepted: 02/21/2022] [Indexed: 06/14/2023]
Abstract
Cu-doped TiO2 (0.1, 0.25, and 0.5% Cu-TiO2) photocatalyst was prepared by sol-gel method and was characterized by powder XRD, FTIR, TEM, SEM, EDX, UV-vis diffuse reflectance (DRS), photoluminescence (PL), and Raman spectroscopy. The XRD spectrum shows tetragonal anatase phase. TEM analysis indicate that the nanoparticles were spherical with sizes 12-13 nm. The degradation of NB was studied, and an optimal degradation time of 180 min led to 98.6% NB abatement of NB = 0.05 mM, pH = 4, and catalyst loading = 50 mg/100 mL, under visible light. The degradation of NB follows the pseudo-first-order kinetics. The reusability studies indicated the excellent stability of 0.25% Cu-TiO2.
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Affiliation(s)
- Tehmina Akhtar
- School of Natural Sciences, National University of Sciences and Technology, H-12, Islamabad, 44000, Pakistan
| | - Habib Nasir
- School of Natural Sciences, National University of Sciences and Technology, H-12, Islamabad, 44000, Pakistan.
| | - Effat Sitara
- School of Natural Sciences, National University of Sciences and Technology, H-12, Islamabad, 44000, Pakistan
| | - Syeda Aqsa Batool Bukhari
- School of Natural Sciences, National University of Sciences and Technology, H-12, Islamabad, 44000, Pakistan
| | - Sharif Ullah
- School of Natural Sciences, National University of Sciences and Technology, H-12, Islamabad, 44000, Pakistan
| | - Rana Muhammad Arslan Iqbal
- School of Natural Sciences, National University of Sciences and Technology, H-12, Islamabad, 44000, Pakistan
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4
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Wang L, Li B, Dionysiou DD, Chen B, Yang J, Li J. Overlooked Formation of H 2O 2 during the Hydroxyl Radical-Scavenging Process When Using Alcohols as Scavengers. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:3386-3396. [PMID: 35230098 DOI: 10.1021/acs.est.1c03796] [Citation(s) in RCA: 42] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Hydroxyl radical (•OH) is an active species widely reported in studies across many scientific fields, and hence, its reliable analysis is vitally important. Currently, alcohols are commonly used as scavengers for •OH determination. However, the impacts of alcohols on the reliability of •OH detection remain unknown. In this study, we found that adding different types and different amounts of alcohols in water samples treated with ultraviolet irradiation undesirably produced substantial amounts of hydrogen peroxide (H2O2), which is a known •OH precursor. This means that the conventional •OH determination method using alcohols is likely unreliable or even misleading. Through careful investigation, we revealed an overlooked reaction pathway during H2O2 and •OH transformations. Varying oxygen concentrations, pHs, alcohol dosages, and types altered H2O2 formation, which can affect •OH determination accuracy. Among alcohols, n-butanol is the best scavenger because it quenches •OH rapidly but re-forms little H2O2.
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Affiliation(s)
- Lei Wang
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Shenzhen 518055, China
- Aquatic Plant Research Center, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China
| | - Boqiang Li
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Shenzhen 518055, China
| | - Dionysios D Dionysiou
- Department of Chemical and Environmental Engineering, University of Cincinnati, Cincinnati, Ohio 45221-0012, United States
| | - Baiyang Chen
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Shenzhen 518055, China
| | - Jie Yang
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Shenzhen 518055, China
| | - Juan Li
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Shenzhen 518055, China
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5
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Alwin E, Wojcieszak R, Kočí K, Edelmannová M, Zieliński M, Suchora A, Pędziński T, Pietrowski M. Reductive Modification of Carbon Nitride Structure by Metals-The Influence on Structure and Photocatalytic Hydrogen Evolution. MATERIALS (BASEL, SWITZERLAND) 2022; 15:710. [PMID: 35160664 PMCID: PMC8836795 DOI: 10.3390/ma15030710] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Revised: 01/13/2022] [Accepted: 01/14/2022] [Indexed: 01/27/2023]
Abstract
Pt, Ru, and Ir were introduced onto the surface of graphitic carbon nitride (g-C3N4) using the wet impregnation method. A reduction of these photocatalysts with hydrogen causes several changes, such as a significant increase in the specific surface area, a C/N atomic ratio, a number of defects in the crystalline structure of g-C3N4, and the contribution of nitrogen bound to the amino and imino groups. According to the X-ray photoelectron spectroscopy results, a transition layer is formed at the g-C3N4/metal nanoparticle interphase, which contains metal at a positive degree of oxidation bonded to nitrogen. These structural changes significantly enhanced the photocatalytic activity in the production of hydrogen through the water-splitting reaction. The activity of the platinum photocatalyst was 24 times greater than that of pristine g-C3N4. Moreover, the enhanced activity was attributed to significantly better separation of photogenerated electron-hole pairs on metal nanoparticles and structural distortions of g-C3N4.
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Affiliation(s)
- Emilia Alwin
- Faculty of Chemistry, Adam Mickiewicz University, Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznan, Poland; (E.A.); (M.Z.); (A.S.); (T.P.)
| | - Robert Wojcieszak
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181-UCCS-Unité de Catalyse et Chimie du Solide, F-59000 Lille, France;
| | - Kamila Kočí
- Institute of Environmental Technology, CEET, VSB-Technical University of Ostrava, 17. listopadu 15/2172, 70800 Ostrava-Poruba, Czech Republic; (K.K.); (M.E.)
| | - Miroslava Edelmannová
- Institute of Environmental Technology, CEET, VSB-Technical University of Ostrava, 17. listopadu 15/2172, 70800 Ostrava-Poruba, Czech Republic; (K.K.); (M.E.)
| | - Michał Zieliński
- Faculty of Chemistry, Adam Mickiewicz University, Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznan, Poland; (E.A.); (M.Z.); (A.S.); (T.P.)
| | - Agata Suchora
- Faculty of Chemistry, Adam Mickiewicz University, Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznan, Poland; (E.A.); (M.Z.); (A.S.); (T.P.)
| | - Tomasz Pędziński
- Faculty of Chemistry, Adam Mickiewicz University, Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznan, Poland; (E.A.); (M.Z.); (A.S.); (T.P.)
- Centre for Advanced Technologies, Adam Mickiewicz University, Poznań, Uniwersytetu Poznańskiego 10, 61-614 Poznan, Poland
| | - Mariusz Pietrowski
- Faculty of Chemistry, Adam Mickiewicz University, Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznan, Poland; (E.A.); (M.Z.); (A.S.); (T.P.)
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6
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Wang X, Hong S, Lian H, Zhan X, Cheng M, Huang Z, Manzo M, Cai L, Nadda A, Le QV, Xia C. Photocatalytic degradation of surface-coated tourmaline-titanium dioxide for self-cleaning of formaldehyde emitted from furniture. JOURNAL OF HAZARDOUS MATERIALS 2021; 420:126565. [PMID: 34252680 DOI: 10.1016/j.jhazmat.2021.126565] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Revised: 06/08/2021] [Accepted: 07/01/2021] [Indexed: 06/13/2023]
Abstract
Formaldehyde emission is an intrinsic property derived from aldehyde-based resin that is used in wood-based composites. To reduce formaldehyde emission from plywood, the composite catalyst of tourmaline-titanium dioxide (T-TiO2) was fabricated by the sol-gel method. Furthermore, the impregnated paper loaded with the T-TiO2 composite catalyst was used to decorate the surface of 5-layer poplar plywood. The physicochemical structure, photocatalytic activity of T-TiO2 composite catalyst and its mechanism of degrading gaseous formaldehyde and generating air negative ions were assessed. The results discovered that the synergistic influence of the tourmaline and TiO2 anatase nanocrystals achieved good photodegradation of the gaseous formaldehyde. The neat T(20%)-TiO2 catalyst offered a higher formaldehyde removal efficiency (92.2%) than other catalysts, possessing 800 ions/cm3 of air negative ions concentration after 10-h visible light irradiation. The poplar plywood with a load of 3% T(20%)-TiO2 catalyst can stably induce the degradation formaldehyde into air negative ions with a concentration of 1200 ions/cm3 in visible light. The impregnation process of paper was feasible to be industrialized and the decorated wood-based composites can be widely applied in the furniture industry.
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Affiliation(s)
- Xiangjie Wang
- Co-Innovation Center of Efficient Processing and Utilization of Forestry Resources, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, China; Jiangsu Engineering Research Center of Fast-growing Trees and Agri-fiber Materials, Nanjing, Jiangsu 210037, China
| | - Shu Hong
- Co-Innovation Center of Efficient Processing and Utilization of Forestry Resources, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, China; Jiangsu Engineering Research Center of Fast-growing Trees and Agri-fiber Materials, Nanjing, Jiangsu 210037, China
| | - Hailan Lian
- Co-Innovation Center of Efficient Processing and Utilization of Forestry Resources, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, China; Jiangsu Engineering Research Center of Fast-growing Trees and Agri-fiber Materials, Nanjing, Jiangsu 210037, China.
| | - Xianxu Zhan
- DeHua TB New Decoration Materials Co., Ltd. Enterprise of Graduate Research Station of Jiangsu Province, Huzhou, Zhejiang 313200, China
| | - Mingjuan Cheng
- DeHua TB New Decoration Materials Co., Ltd. Enterprise of Graduate Research Station of Jiangsu Province, Huzhou, Zhejiang 313200, China
| | - Zhenhua Huang
- Department of Mechanical Engineering, University of North Texas, Denton, TX 76207, USA
| | - Maurizio Manzo
- Department of Mechanical Engineering, University of North Texas, Denton, TX 76207, USA
| | - Liping Cai
- Co-Innovation Center of Efficient Processing and Utilization of Forestry Resources, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, China; Department of Mechanical Engineering, University of North Texas, Denton, TX 76207, USA
| | - Ashok Nadda
- Department of Biotechnology and Bioinformatics, Jaypee University of Information Technology, Waknaghat, Solan 173 234, India
| | - Quyet Van Le
- Department of Materials Science and Engineering, Korea University, 145, Anam-ro Seongbuk-gu, Seoul 02841, South Korea
| | - Changlei Xia
- Co-Innovation Center of Efficient Processing and Utilization of Forestry Resources, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, China; Jiangsu Engineering Research Center of Fast-growing Trees and Agri-fiber Materials, Nanjing, Jiangsu 210037, China.
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7
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Vital-Grappin AD, Ariza-Tarazona MC, Luna-Hernández VM, Villarreal-Chiu JF, Hernández-López JM, Siligardi C, Cedillo-González EI. The Role of the Reactive Species Involved in the Photocatalytic Degradation of HDPE Microplastics Using C,N-TiO 2 Powders. Polymers (Basel) 2021; 13:999. [PMID: 33805116 PMCID: PMC8037624 DOI: 10.3390/polym13070999] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Revised: 03/21/2021] [Accepted: 03/22/2021] [Indexed: 12/18/2022] Open
Abstract
Microplastics (MPs) are distributed in a wide range of aquatic and terrestrial ecosystems throughout the planet. They are known to adsorb hazardous substances and can transfer them across the trophic web. To eliminate MPs pollution in an environmentally friendly process, we propose using a photocatalytic process that can easily be implemented in wastewater treatment plants (WWTPs). As photocatalysis involves the formation of reactive species such as holes (h+), electrons (e-), hydroxyl (OH●), and superoxide ion (O2●-) radicals, it is imperative to determine the role of those species in the degradation process to design an effective photocatalytic system. However, for MPs, this information is limited in the literature. Therefore, we present such reactive species' role in the degradation of high-density polyethylene (HDPE) MPs using C,N-TiO2. Tert-butanol, isopropyl alcohol (IPA), Tiron, and Cu(NO3)2 were confirmed as adequate OH●, h+, O2●- and e- scavengers. These results revealed for the first time that the formation of free OH● through the pathways involving the photogenerated e- plays an essential role in the MPs' degradation. Furthermore, the degradation behaviors observed when h+ and O2●- were removed from the reaction system suggest that these species can also perform the initiating step of degradation.
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Affiliation(s)
- Aranza Denisse Vital-Grappin
- Universidad Autónoma de Nuevo León, Facultad de Ciencias Químicas, Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza C.P. 66455, Nuevo León, Mexico; (A.D.V.-G.); (V.M.L.-H.); (J.M.H.-L.)
| | - Maria Camila Ariza-Tarazona
- Department of Engineering “Enzo Ferrari”, University of Modena and Reggio Emilia, Via P. Vivarelli 10/1, 41125 Modena, Italy; (M.C.A.-T.); (C.S.)
| | - Valeria Montserrat Luna-Hernández
- Universidad Autónoma de Nuevo León, Facultad de Ciencias Químicas, Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza C.P. 66455, Nuevo León, Mexico; (A.D.V.-G.); (V.M.L.-H.); (J.M.H.-L.)
| | - Juan Francisco Villarreal-Chiu
- Universidad Autónoma de Nuevo León, Facultad de Ciencias Químicas, Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza C.P. 66455, Nuevo León, Mexico; (A.D.V.-G.); (V.M.L.-H.); (J.M.H.-L.)
- Centro de Investigación en Biotecnología y Nanotecnología (CIByN), Facultad de Ciencias Químicas, Universidad Autónoma de Nuevo León, Parque de Investigación e Innovación Tecnológica, Km. 10 Autopista al Aeropuerto Internacional Mariano Escobedo, Apodaca 66629, Nuevo León, Mexico
| | - Juan Manuel Hernández-López
- Universidad Autónoma de Nuevo León, Facultad de Ciencias Químicas, Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza C.P. 66455, Nuevo León, Mexico; (A.D.V.-G.); (V.M.L.-H.); (J.M.H.-L.)
| | - Cristina Siligardi
- Department of Engineering “Enzo Ferrari”, University of Modena and Reggio Emilia, Via P. Vivarelli 10/1, 41125 Modena, Italy; (M.C.A.-T.); (C.S.)
| | - Erika Iveth Cedillo-González
- Universidad Autónoma de Nuevo León, Facultad de Ciencias Químicas, Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza C.P. 66455, Nuevo León, Mexico; (A.D.V.-G.); (V.M.L.-H.); (J.M.H.-L.)
- Department of Engineering “Enzo Ferrari”, University of Modena and Reggio Emilia, Via P. Vivarelli 10/1, 41125 Modena, Italy; (M.C.A.-T.); (C.S.)
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8
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Peper JL, Gentry NE, Brezny AC, Field MJ, Green MT, Mayer JM. Different Kinetic Reactivity of Electrons in Distinct TiO 2 Nanoparticle Trap States. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2021; 125:680-690. [PMID: 34178203 PMCID: PMC8232823 DOI: 10.1021/acs.jpcc.0c10633] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Electrons added to TiO2 and other semiconductors often occupy trap states, whose reactivity can determine the catalytic and stoichiometric chemistry of the material. We previously showed that reduced aqueous colloidal TiO2 nanoparticles have two distinct classes of thermally-equilibrated trapped electrons, termed Red/e - and Blue/e -. Presented here are parallel optical and electron paramagnetic resonance (EPR) kinetic studies of the reactivity of these electrons with solution-based oxidants. Optical stopped-flow measurements monitoring reactions of TiO2/e - with sub-stoichiometric oxidants showed a surprising pattern: an initial fast (seconds) decrease in TiO2/e - absorbance followed by a secondary, slow (minutes) increase in the broad TiO2/e - optical feature. Analysis revealed that the fast decrease is due to the preferential oxidation of the Red/e - trap states, and the slow increase results from re-equilibration of electrons from Blue to Red states. This kinetic model was confirmed by freeze-quench EPR measurements. Quantitative analysis of the kinetic data demonstrated that Red/e - react ~5 times faster than Blue/e - with the nitroxyl radical oxidant, 4-MeO-TEMPO. Similar reactivity patterns were also observed in oxidations of TiO2/e - by O2, which like 4-MeO-TEMPO is a proton-coupled electron transfer (PCET) oxidant, and by the pure electron transfer (ET) oxidant KI3. This suggests that the faster intrinsic reactivity of one trap state over another on the seconds-minutes timescale is likely a general feature of reduced TiO2 reactivity. This differential trap state reactivity is likely to influence the performance of TiO2 in photochemical/electrochemical devices, and it suggests an opportunity for tuning catalysis.
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Affiliation(s)
- Jennifer L. Peper
- Department of Chemistry, Yale University, New Haven, Connecticut 06520-8107, United States
| | - Noreen E. Gentry
- Department of Chemistry, Yale University, New Haven, Connecticut 06520-8107, United States
| | - Anna C. Brezny
- Department of Chemistry, Yale University, New Haven, Connecticut 06520-8107, United States
- Department of Chemistry, Skidmore College, Saratoga Springs, New York 12866, United States
| | - Mackenzie J. Field
- Department of Chemistry and Department of Molecular Biology and Biochemistry, University of California, Irvine, California 92697, United States
| | - Michael T. Green
- Department of Chemistry and Department of Molecular Biology and Biochemistry, University of California, Irvine, California 92697, United States
| | - James M. Mayer
- Department of Chemistry, Yale University, New Haven, Connecticut 06520-8107, United States
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Gurung K, Ncibi MC, Thangaraj SK, Jänis J, Seyedsalehi M, Sillanpää M. Removal of pharmaceutically active compounds (PhACs) from real membrane bioreactor (MBR) effluents by photocatalytic degradation using composite Ag2O/P-25 photocatalyst. Sep Purif Technol 2019. [DOI: 10.1016/j.seppur.2018.12.069] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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10
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Hernández-Ferrer J, Ansón-Casaos A, Víctor-Román S, Santidrián A, Benito AM, Maser WK. Charge-transfer characteristics in carbon nanostructure/metal oxide photoelectrodes efficiently probed by hydrogen peroxide. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2018.09.028] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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11
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Khaki MRD, Shafeeyan MS, Raman AAA, Daud WMAW. Application of doped photocatalysts for organic pollutant degradation - A review. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2017; 198:78-94. [PMID: 28501610 DOI: 10.1016/j.jenvman.2017.04.099] [Citation(s) in RCA: 192] [Impact Index Per Article: 27.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Revised: 04/27/2017] [Accepted: 04/30/2017] [Indexed: 06/07/2023]
Abstract
Advanced oxidation process involves production of hydroxyl radical for industrial wastewater treatment. This method is based on the irradiation of UV light to photocatalysts such as TiO2 and ZnO for photodegradation of pollutant. UV light is used for irradiation in photocatalytic process because TiO2 has a high band gap energy which is around 3.2 eV. There can be shift adsorption to visible light by reducing the band gap energy to below 3.2 eV. Doped catalyst is one of the means to reduce band gap energy. Different methods are used for doped catalyst which uses transition metals and titanium dioxide. The band gap energy of three types of transition metals Fe, Cd and Co after being doped with TiO2, are around 2.88 ev, 2.97ev and 2.96 ev, respectively which are all below TiO2 energy. Some of the transition metals change the energy level to below 3.2 eV and the adsorption shifts to visible light for degradation of industrial pollutant after being doped with titanium dioxide. This paper aims at providing a deep insight into advanced oxidation processes, photocatalysts and their applications in wastewater treatment, doping processes and the effects of operational factors on photocatalytic degradation.
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Affiliation(s)
- Mohammad Reza Delsouz Khaki
- Department of Chemical Engineering, Faculty of Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia
| | - Mohammad Saleh Shafeeyan
- School of Chemical Engineering, College of Engineering, University of Tehran, 11155/4563, Tehran, Iran.
| | - Abdul Aziz Abdul Raman
- Department of Chemical Engineering, Faculty of Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia.
| | - Wan Mohd Ashri Wan Daud
- Department of Chemical Engineering, Faculty of Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia
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12
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Zhao X, Wang Y, Feng W, Lei H, Li J. Preparation of Cu(ii) porphyrin–TiO2 composite in one-pot method and research on photocatalytic property. RSC Adv 2017. [DOI: 10.1039/c7ra09585f] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
A promising strategy for porphyrin–TiO2 photocatalyst preparation by using sol–gel process and solvothermal condition showed prospective utilization in the field of dye pollutant photodegradation.
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Affiliation(s)
- Xin Zhao
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education
- College of Chemistry & Materials Science
- Northwest University
- Xi'an
- P. R. China
| | - Ying Wang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education
- College of Chemistry & Materials Science
- Northwest University
- Xi'an
- P. R. China
| | - Wenhua Feng
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education
- College of Chemistry & Materials Science
- Northwest University
- Xi'an
- P. R. China
| | - Hengtao Lei
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education
- College of Chemistry & Materials Science
- Northwest University
- Xi'an
- P. R. China
| | - Jun Li
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education
- College of Chemistry & Materials Science
- Northwest University
- Xi'an
- P. R. China
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13
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Gligorovski S, Strekowski R, Barbati S, Vione D. Environmental Implications of Hydroxyl Radicals (•OH). Chem Rev 2015; 115:13051-92. [DOI: 10.1021/cr500310b] [Citation(s) in RCA: 737] [Impact Index Per Article: 81.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Sasho Gligorovski
- Aix-Marseille
Université, CNRS, LCE UMR 7376, 13331 Marseilles, France
| | - Rafal Strekowski
- Aix-Marseille
Université, CNRS, LCE UMR 7376, 13331 Marseilles, France
| | - Stephane Barbati
- Aix-Marseille
Université, CNRS, LCE UMR 7376, 13331 Marseilles, France
| | - Davide Vione
- Dipartimento
di Chimica, Università di Torino, Via P. Giuria 5, 10125 Torino, Italy
- Centro
Interdipartimentale NatRisk, Università di Torino, Via L. Da
Vinci 44, 10095 Grugliasco, Italy
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14
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Ndong LBB, Ibondou MP, Miao Z, Gu X, Lu S, Qiu Z, Sui Q, Mbadinga SM. Efficient dechlorination of chlorinated solvent pollutants under UV irradiation by using the synthesized TiO2 nano-sheets in aqueous phase. J Environ Sci (China) 2014; 26:1188-1194. [PMID: 25079650 DOI: 10.1016/s1001-0742(13)60541-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2013] [Revised: 10/29/2013] [Accepted: 11/08/2013] [Indexed: 06/03/2023]
Abstract
Titanium dioxide (TiO2), which is the widely used photo-catalyst, has been synthesized by simple hydrothermal solution containing tetrabutyl titanate and hydrofluoric acid. The synthesized product has been applied to photo-degradation in aqueous phase of chlorinated solvents, namely tetrachloroethene (PCE), trichloroethene (TCE) and 1,1,1-trichloroethane (TCA). The photo-degradation results revealed that the degradation of these harmful chemicals was better in UV/synthesized TiO2 system compared to UV/commercial P25 system and UV only system. The photo-catalytic efficiency of the synthesized TiO2 was 1.4, 1.8 and 3.0 folds higher compared to the commercial P25 for TCA, TCE and PCE degradation, respectively. Moreover, using nitrobenzene (NB) as a probe of hydroxyl radical (·OH), the degradation rate was better over UV/synthesized TiO2, suggesting the high concentration of ·OH generated in UV/synthesized TiO2 system. In addition, ·OH concentration was confirmed by the strong peak displayed in EPR analysis over UV/synthesized TiO2 system. The characterization result using XRD and TEM showed that the synthesized TiO2 was in anatase form and consisted of well-defined sheet-shaped structures having a rectangular outline with a thickness of 4 nm, side length of 50 nm and width of 33 nm and a surface 90.3 m(2)/g. XPS analysis revealed that ≡Ti-F bond was formed on the surface of the synthesized TiO2. The above results on both photocatalytic activity and the surface analysis demonstrated the good applicability of the synthesized TiO2 nano-sheets for the remediation of chlorinated solvent contaminated groundwater.
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Affiliation(s)
- Landry Biyoghe Bi Ndong
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China.
| | - Murielle Primaelle Ibondou
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China
| | - Zhouwei Miao
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China
| | - Xiaogang Gu
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China
| | - Shuguang Lu
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China.
| | - Zhaofu Qiu
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China
| | - Qian Sui
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China
| | - Serge Maurice Mbadinga
- State Key Laboratory of Bioreactor Engineering and Institute of Applied Chemistry, East China University of Science and Technology, Shanghai 200237, China
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15
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Biyoghe Bi Ndong L, Ibondou MP, Gu X, Lu S, Qiu Z, Sui Q, Mbadinga SM. Enhanced Photocatalytic Activity of TiO2 Nanosheets by Doping with Cu for Chlorinated Solvent Pollutants Degradation. Ind Eng Chem Res 2014. [DOI: 10.1021/ie403405z] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Landry Biyoghe Bi Ndong
- State Environmental Protection Key Laboratory
of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China
| | - Murielle Primaelle Ibondou
- State Environmental Protection Key Laboratory
of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China
| | - Xiaogang Gu
- State Environmental Protection Key Laboratory
of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China
| | - Shuguang Lu
- State Environmental Protection Key Laboratory
of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China
| | - Zhaofu Qiu
- State Environmental Protection Key Laboratory
of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China
| | - Qian Sui
- State Environmental Protection Key Laboratory
of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China
| | - Serge Maurice Mbadinga
- State Key Laboratory of Bioreactor Engineering
and Institute of Applied Chemistry, East China University of Science and Technology, Shanghai 200237, China
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16
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Improved Texturing and Photocatalytic Efficiency in TiO2Films Grown Using Aerosol-Assisted CVD and Atmospheric Pressure CVD. ACTA ACUST UNITED AC 2013. [DOI: 10.1002/cvde.201307067] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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17
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Surface modification of TiO2 photocatalyst for environmental applications. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS 2013. [DOI: 10.1016/j.jphotochemrev.2012.10.001] [Citation(s) in RCA: 721] [Impact Index Per Article: 65.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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18
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Generation of Free OHaq Radicals by Black Light Illumination of Degussa (Evonik) P25 TiO2 Aqueous Suspensions. Catalysts 2013. [DOI: 10.3390/catal3020418] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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19
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Rabani J, Goldstein S. Mechanisms of Reactions Induced by Photocatalysis of Titanium Dioxide Nanoparticles. ENVIRONMENTAL PHOTOCHEMISTRY PART III 2013. [DOI: 10.1007/698_2013_248] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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20
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Wu Q, van de Krol R. Selective Photoreduction of Nitric Oxide to Nitrogen by Nanostructured TiO2Photocatalysts: Role of Oxygen Vacancies and Iron Dopant. J Am Chem Soc 2012; 134:9369-75. [DOI: 10.1021/ja302246b] [Citation(s) in RCA: 202] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Qingping Wu
- Materials for Energy Conversion and Storage (MECS), Department of Chemical Engineering, Delft University of Technology, P.O. Box 5045, 2600 GA Delft, The Netherlands
| | - Roel van de Krol
- Materials for Energy Conversion and Storage (MECS), Department of Chemical Engineering, Delft University of Technology, P.O. Box 5045, 2600 GA Delft, The Netherlands
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21
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Zhang D. Influence of Pt promoter on the photo-oxidative degradation by visible-light plasmonic Pt-titania catalyst. HIGH ENERGY CHEMISTRY 2012. [DOI: 10.1134/s0018143912020130] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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22
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Zigah D, Rodríguez-López J, Bard AJ. Quantification of photoelectrogenerated hydroxyl radical on TiO2 by surface interrogation scanning electrochemical microscopy. Phys Chem Chem Phys 2012; 14:12764-72. [DOI: 10.1039/c2cp40907k] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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23
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Du Y, Goldstein S, Rabani J. The catalytic effects of copper ions on photo-oxidation in TiO2 suspensions: The role of superoxide radicals. J Photochem Photobiol A Chem 2011. [DOI: 10.1016/j.jphotochem.2011.07.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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24
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Kubacka A, Fernández-García M, Colón G. Advanced Nanoarchitectures for Solar Photocatalytic Applications. Chem Rev 2011; 112:1555-614. [DOI: 10.1021/cr100454n] [Citation(s) in RCA: 1901] [Impact Index Per Article: 146.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Anna Kubacka
- Instituto de Catálisis y Petroleoquímica, CSIC, C/Marie Curie 2, 28049-Madrid, Spain
| | | | - Gerardo Colón
- Instituto de Ciencia de Materiales de Sevilla, Centro Mixto CSIC-Universidad de Sevilla, C/Américo Vespucio, 49, 41092-Sevilla, Spain
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Wang R, Jiang G, Ding Y, Wang Y, Sun X, Wang X, Chen W. Photocatalytic activity of heterostructures based on TiO2 and halloysite nanotubes. ACS APPLIED MATERIALS & INTERFACES 2011; 3:4154-8. [PMID: 21916434 DOI: 10.1021/am201020q] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
A one-step solvothermal method was used to prepare TiO(2)/halloysite composites. TiO(2) nanoparticles were deposited on the platform of the halloysite nanotubes (HNTs). XRD, FT-IR, FE-SEM, and TEM were applied to investigate the structures and morphologies of the resultant samples. The as-prepared TiO(2)/HNTs photocatalyst exhibits pH sensibility on the degradation of methanol and a higher photocatalytic activity on the degradation of acetic acid. The combination of the photocatalytic property of TiO(2) and the unique structure of halloysite endowed this material with a bright perspective in degradation of organic pollutant.
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Affiliation(s)
- Rijing Wang
- Department of Materials Engineering, College of Materials and Textile, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, PR China
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26
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Gao S, Jia X, Li Z, Chen Y, Jiang K. Antibiotic-inspired zinc oxide with morphology-dependent photocatalytic activity. CAN J CHEM 2011. [DOI: 10.1139/v11-023] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
ZnO materials with different morphologies (hexahedron, coneflowerlike, cauliflowerlike, and nanorods) have been synthesized via a bioinspired method, which is effective and facile for the controlled synthesis of ZnO. Zinc acetate and ammonia were used as growth precursors, and ampicillin was used as the morphology-directing agent. X-ray diffraction (XRD) data showed that the obtained ZnO with different morphologies displayed different crystal growth habits. Photodegradation of Orange G was used as a model reaction to test the photocatalytic activity of ZnO samples. Different morphologies exhibited different activities to Orange G degradation. The cauliflowerlike ZnO sample showed the best photocatalytic performance compared with the others. The influence of the morphology-directing agent and pH on the morphology of ZnO samples and the effect of the morphologies on the photocatalytic activity are tentatively discussed.
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Affiliation(s)
- Shuyan Gao
- College of Chemistry and Environmental Science, Henan Normal University, 46 Jianshe street, Xinxiang, 453007, Henan, P. R. China
| | - Xiaoxia Jia
- College of Chemistry and Environmental Science, Henan Normal University, 46 Jianshe street, Xinxiang, 453007, Henan, P. R. China
| | - Zhengdao Li
- College of Chemistry and Environmental Science, Henan Normal University, 46 Jianshe street, Xinxiang, 453007, Henan, P. R. China
| | - Yanli Chen
- College of Chemistry and Environmental Science, Henan Normal University, 46 Jianshe street, Xinxiang, 453007, Henan, P. R. China
| | - Kai Jiang
- College of Chemistry and Environmental Science, Henan Normal University, 46 Jianshe street, Xinxiang, 453007, Henan, P. R. China
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27
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Karunakaran C, Narayanan S, Gomathisankar P. Photocatalytic degradation of 1-naphthol by oxide ceramics with added bacterial disinfection. JOURNAL OF HAZARDOUS MATERIALS 2010; 181:708-715. [PMID: 20542635 DOI: 10.1016/j.jhazmat.2010.05.070] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2010] [Revised: 05/14/2010] [Accepted: 05/15/2010] [Indexed: 05/29/2023]
Abstract
1-Naphthol photodegrades on the surfaces of TiO(2), ZnO, CeO(2), CdO, WO(3), Co(3)O(4), Sb(2)O(3), ZrO(2), La(2)O(3), Y(2)O(3), Pr(6)O(11), Sm(2)O(3) and Al(2)O(3), albeit at different efficiencies, and all the oxides show sustainable photocatalytic activity. The degradation conforms to the Langmuir-Hinshelwood kinetic model and enhances with the intensity of illumination. Dissolved oxygen is essential for the degradation. ZnO and TiO(2) anatase are the most efficient photocatalysts to degrade 1-naphthol. ZnO wurtzite, besides serving as an effective photocatalyt to degrade 1-naphthol, also acts as a bactericide; it inactivates E.coli even in absence of direct light. At a loading of 0.8 g L(-1), it kills about 44% of 2.5x10(12) CFU mL(-1) E. coli in (1/2) h under dark condition.
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29
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Brezová V, Billik P, Vrecková Z, Plesch G. Photoinduced formation of reactive oxygen species in suspensions of titania mechanochemically synthesized from TiCl4. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.molcata.2010.05.019] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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30
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Photomineralization of phenol on Al2O3: synergistic photocatalysis by semiconductors. RESEARCH ON CHEMICAL INTERMEDIATES 2010. [DOI: 10.1007/s11164-010-0146-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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31
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Karunakaran C, Anilkumar P, Gomathisankar P. Kinetics of Ag/TiO2-photocatalyzed iodide ion oxidation. MONATSHEFTE FUR CHEMIE 2010. [DOI: 10.1007/s00706-010-0288-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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32
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Karunakaran C, Dhanalakshmi R, Gomathisankar P. Semiconductor-photocatalyzed degradation of carboxylic acids: Enhancement by particulate semiconductor mixture. INT J CHEM KINET 2009. [DOI: 10.1002/kin.20444] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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33
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34
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Karunakaran C, Dhanalakshmi R. Substituent effect on nano TiO2- and ZnO-catalyzed phenol photodegradation rates. INT J CHEM KINET 2009. [DOI: 10.1002/kin.20399] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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35
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Carlotti ME, Ugazio E, Sapino S, Fenoglio I, Greco G, Fubini B. Role of particle coating in controlling skin damage photoinduced by titania nanoparticles. Free Radic Res 2009; 43:312-22. [PMID: 19199115 DOI: 10.1080/10715760802716633] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
TiO(2) nanoparticles hazard is associated to their photocatalytic activity causing release of DNA damaging ROS (Reactive Oxygen Species), lipid peroxidation and skin damage. Various coatings have been proposed to minimize photocatalysis, while keeping the potential to block UV radiations. Uncoated and variously coated commercial nano-titania have been classified on the basis of UVB-induced lipoperoxidation of linoleic acid. A selection of the most and the least protective specimens was then examined by ESR (Electron Spin Resonance) to evidence the presence of surface paramagnetic centres and the release of ROS in aqueous suspensions (spin trapping). Paramagnetic centres and ROS were correlated with the extent of lipid peroxidation. When tested on porcine skin (mimicking the human one), titania acted as on linoleic acid. The combined use of lipid peroxidation of simple fatty acids with ESR analysis is here proposed as a possible screening tool for the evaluation of the potential toxicity of nano-titania in sunscreen preparations.
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Affiliation(s)
- Maria Eugenia Carlotti
- Dipartimento di Scienza e Tecnologia del Farmaco, Università degli Studi di Torino, Italy.
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36
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37
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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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38
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Determination of catalytic properties of TiO2 coatings using aqueous solution of coumarin: Standardization efforts. J Photochem Photobiol A Chem 2009. [DOI: 10.1016/j.jphotochem.2008.10.014] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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39
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Synthesis and Characterization of Rare Earth Orthovanadate (RVO4; R = La, Ce, Nd, Sm, Eu & Gd) Nanorods/Nanocrystals/Nanospindles by a Facile Sonochemical Method and Their Catalytic Properties. J CLUST SCI 2008. [DOI: 10.1007/s10876-008-0229-y] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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40
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Weng Z, Ni X. Oxidative polymerization of pyrrole photocatalyzed by TiO2nanoparticles and interactions in the composites. J Appl Polym Sci 2008. [DOI: 10.1002/app.28636] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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41
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Liu L, Liu H, Zhao YP, Wang Y, Duan Y, Gao G, Ge M, Chen W. Directed synthesis of hierarchical nanostructured TiO2 catalysts and their morphology-dependent photocatalysis for phenol degradation. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2008; 42:2342-8. [PMID: 18504963 DOI: 10.1021/es070980o] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Nanostructured TiO2 with different hierarchical morphologies were synthesized via a warmly hydrothermal route. The properties of the products were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, N2 adsorption, UV-vis spectroscopy, etc. Two of the products, TiO2 1D nanorods (one-dimensional rutile TiO2 nanorods) and TiO2 3D0D microspheres (three-dimensional anatase TiO2 nanoparticle-assembled microspheres) exhibited superior photocatalytic effects on phenol degradation under UV illumination, compared with TiO2 3D1D microspheres (three-dimensional rutile TiO2 nanorods-assembled microspheres). Moreover, TiO2 3D0D was superior to TiO2 1D, as indicated by a 30% higher mineralization of dissolved phenol. Dihydroxybenze, 4,4'-dihydroxybiphenyl, benzoquinone, maleic anhydride, etc. were identified as the degradation intermediates. The excellent catalytic effect was attributed to the structural features of TiO2 1D nanorods and TiO2 3D0D microspheres, that is, a larger amount of surface active sites and a higher band gap energy resulted in more efficient decomposition of organic contaminants.
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Affiliation(s)
- Lu Liu
- Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Tianjin 300071, China.
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42
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Ryu J, Choi W. Substrate-specific photocatalytic activities of TiO2 and multiactivity test for water treatment application. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2008; 42:294-300. [PMID: 18350911 DOI: 10.1021/es071470x] [Citation(s) in RCA: 169] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The multidimensional aspects of the photocatalytic activity were investigated in a systematic way. The photocatalytic activities of eight commercial TiO2 samples were quantified by employing 19 test substrates (phenols, organic acids, amines, chlorohydrocarbons, dyes, inorganic ions, etc.) in terms of their degradation or conversion rates in water. The measured activities exhibited a complex behavior that depends on the test substrate. The photocatalytic activities are roughly correlated only among structurally related compounds. The photocatalytic activities can be represented in many different ways, and even the relative activity order among the tested photocatalysts depends on what substrate is used. Each TiO2 (among eight samples) showed the best activity for at least one test-substrate. This highly substrate-specific activity of TiO2 photocatalysts hinders the straightforward comparison of which catalyst is better than others. Even the common belief that anatase is more photoactive than rutile cannot be fully supported on the basis of the present data set. Although there seems to be no simple correlation between the activity and the common physicochemical parameters of photocatalysts, the substrate-specific activity was analyzed and discussed in terms of various parameters such as surface area, crystallinity, surface charge, and substrate adsorption. Finally, the multivalue photocatalytic activity test in relation with water treatment application was proposed to take the substrate-specificity into account.
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Affiliation(s)
- Jungho Ryu
- School of Environmental Science and Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea
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43
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Hirakawa T, Daimon T, Kitazawa M, Ohguri N, Koga C, Negishi N, Matsuzawa S, Nosaka Y. An approach to estimating photocatalytic activity of TiO2 suspension by monitoring dissolved oxygen and superoxide ion on decomposing organic compounds. J Photochem Photobiol A Chem 2007. [DOI: 10.1016/j.jphotochem.2007.03.012] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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44
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Testino A, Bellobono IR, Buscaglia V, Canevali C, D'Arienzo M, Polizzi S, Scotti R, Morazzoni F. Optimizing the Photocatalytic Properties of Hydrothermal TiO2by the Control of Phase Composition and Particle Morphology. A Systematic Approach. J Am Chem Soc 2007; 129:3564-75. [PMID: 17341070 DOI: 10.1021/ja067050+] [Citation(s) in RCA: 386] [Impact Index Per Article: 22.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The possibility of controlling the photocatalytic activity of TiO2 nanoparticles by tailoring their crystalline structure and morphology is a current topic of great interest. In this study, a broad variety of well-faceted particles with different phase compositions, sizes, and shapes have been obtained from concentrated TiOCl2 solutions by systematically changing temperature, pH, and duration of the hydrothermal treatment. The guide to select the suitable experimental conditions was provided by thermodynamic modeling based on available thermochemical data. By combining the results of TEM, HRTEM, XRD, density, and specific surface area measurements, a complete structural and morphological characterization of the particles was performed. Correlation between the photocatalytic activity in the UV photodegradation of phenol solutions and the particle size was established. Prismatic rutile particles with length/width ratio around 5 and breadth of 60-100 nm showed the highest activity. The surface chemistry of the particles was also investigated. Treatments that decrease the surface acidity, such as washing the powders with ammonia solution and/or calcining at 400 degrees C, have detrimental effect on photocatalytic activity. The overall results suggest correlation between particle morphology and photocatalytic activity and indicate that both electron-hole recombination and adsorption at the surface can be rate-controlling processes. The systematic approach presented in this study demonstrates that a substantial improvement of the photocatalytic activity of TiO2 can be achieved by a careful design of the particle morphology and the control of the surface chemistry.
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Affiliation(s)
- Andrea Testino
- Department of Materials Science, University of Milano-Bicocca, Via R. Cozzi 53, I-20125 Milano, Italy
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45
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CHENG Y, SUN H, JIN W, XU N. Effect of Preparation Conditions on Visible Photocatalytic Activity of Titania Synthesized by Solution Combustion Method. Chin J Chem Eng 2007. [DOI: 10.1016/s1004-9541(07)60055-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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46
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Thompson TL, Yates JT. Surface Science Studies of the Photoactivation of TiO2New Photochemical Processes. Chem Rev 2006; 106:4428-53. [PMID: 17031993 DOI: 10.1021/cr050172k] [Citation(s) in RCA: 920] [Impact Index Per Article: 51.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tracy L Thompson
- Surface Science Center, Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260, USA
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Bizeto MA, Alves WA, Barbosa CAS, Ferreira AMDC, Constantino VRL. Evaluation of Hexaniobate Nanoscrolls as Support for Immobilization of a Copper Complex Catalyst. Inorg Chem 2006; 45:6214-21. [PMID: 16878930 DOI: 10.1021/ic0600580] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In this work, we report the intercalation properties of the hexaniobate nanoscrolls toward insertion of 2-[2-(2-pyridyl)ethylimino-1-ethyl]pyridine-imidazole copper(II), [Cu(apip)imH]2+, a cationic complex able to promote the catalytic oxidation of organic substrates. Hexaniobate was first transformed into its acidic phase, H2K2Nb6O17, and then exfoliated with n-butylamine in water. The copper complex was immobilized into the nanoscrolls obtained by the acidification of delaminated particle dispersion at pH 3. TEM micrographs of particles after immobilization of the cationic complex show scrolls with external diameters of ca. 25-30 nm and wall thicknesses of about 4.5-7.0 nm. The basal spacing (d(040)) of the copper complex intercalated in hexaniobate is about 11.6 A. The estimated composition, [Cu(apip)imH](0.5)HK2Nb6O17.6H2O, indicates that 50% of the negative charge of interlayer I was neutralized by the copper complex. EPR and IR spectra showed that the ligands and the distorted tetragonal structure of the complex were maintained after immobilization into niobate. The reactivity of this new material toward catechol oxidation using hydrogen peroxide as the oxidizing agent was investigated and compared to the activity of the same complex in solution. The heterogeneous catalyst is initially less effective toward the catechol oxidation but with time, the reaction shows a higher catechol conversion (ca. 82%) than the same copper complex in homogeneous media (ca. 75%). A better reactivity of the heterogeneous catalyst may be related to the stabilization of the immobilized catalyst, preventing its degradation during the reaction course. EPR results show that the kinetics of formation of the DMPO/*OH adduct in homogeneous and heterogeneous conditions corresponds to that observed in the catechol oxidation, suggesting that hydroxyl radicals are involved in the reaction mechanism.
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Affiliation(s)
- Marcos A Bizeto
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Avenida Lineu Prestes 748, C.P. 26077, CEP 05513-970 São Paulo, Brazil
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Tachikawa T, Tojo S, Fujitsuka M, Sekino T, Majima T. Photoinduced Charge Separation in Titania Nanotubes. J Phys Chem B 2006; 110:14055-9. [PMID: 16854100 DOI: 10.1021/jp063800q] [Citation(s) in RCA: 107] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The photocatalytic one-electron oxidation reaction of an aromatic compound during UV light irradiation of titania nanotubes and nanoparticles was investigated using time-resolved diffuse reflectance spectroscopy. Remarkably long-lived radical cations of the aromatic compound and trapped electrons were observed for the nanotubes when compared to those for nanoparticles. The influences of the morphology on the one-electron oxidation process of an aromatic compound adsorbed on the surface were discussed in terms of the charge recombination dynamics between the radical cation and electrons in TiO2.
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Affiliation(s)
- Takashi Tachikawa
- The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047, Japan
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Kusić H, Koprivanac N, Locke BR. Decomposition of phenol by hybrid gas/liquid electrical discharge reactors with zeolite catalysts. JOURNAL OF HAZARDOUS MATERIALS 2005; 125:190-200. [PMID: 16002210 DOI: 10.1016/j.jhazmat.2005.05.028] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2005] [Revised: 05/17/2005] [Accepted: 05/24/2005] [Indexed: 05/03/2023]
Abstract
Application of hybrid gas/liquid electrical discharge reactors and a liquid phase direct electrical discharge reactor for degradation of phenol in the presence and absence of zeolites have been investigated. Hybrid gas/liquid electrical discharges involve simultaneous high voltage electrical discharges in water and in the gas phase above the water surface leading to the additional OH radicals in the liquid phase and ozone formation in the gas phase with subsequent dissolution into the liquid. The role of applied zeolites, namely NH4ZSM5, FeZSM5 and HY, were also studied. Phenol degradation and production of primary phenol by-products, catechol and hydroquinone, during the treatment were monitored by HPLC measurements. The highest phenol removal results, 89.4-93.6%, were achieved by electrical discharge in combination with FeZSM5 in all three configurations of corona reactors. These results indicate that the Fenton reaction has significant influence on overall phenol removal efficiency in the electrical discharge/FeZSM5 system due to the additional OH radical formation from hydrogen peroxide generated by the water phase discharge.
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Affiliation(s)
- Hrvoje Kusić
- Department of Chemical and Biomedical Engineering, Florida State University, FAMU-FSU College of Engineering, 2525 Pottsdamer Street, Tallahassee, FL 32310, USA
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Hamad S, Catlow CRA, Woodley SM, Lago S, Mejías JA. Structure and Stability of Small TiO2 Nanoparticles. J Phys Chem B 2005; 109:15741-8. [PMID: 16852997 DOI: 10.1021/jp0521914] [Citation(s) in RCA: 194] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The effect of the nanostructure on the photochemistry of TiO2 is an active field of research owing to its applications in photocatalysis and photovoltaics. Despite this interest, little is known of the structure of small particles of this oxide with sizes at the nanometer length scale. Here we present a computational study that locates the global minima in the potential energy surface of Ti(n)O2n clusters with n = 1-15. The search procedure does not refer to any of the known TiO2 polymorphs, and is based on a novel combination of simulated annealing and Monte Carlo basin hopping simulations, together with genetic algorithm techniques, with the energy calculated by means of an interatomic potential. The application of several different methods increases our confidence of having located the global minimum. The stable structures are then refined by means of density functional theory calculations. The results from the two techniques are similar, although the methods based on interatomic potentials are unable to describe some subtle effects. The agreement is especially good for the larger particles, with n = 9-15. For these sizes the structures are compact, with a preference for a central octahedron and a surrounding layer of 4- and 5-fold coordinated Ti atoms, although there seems to be some energy penalty for particles containing the 5-fold coordinated metal atoms with square base pyramid geometry and dangling Ti=O bonds. The novel structures reported provide the basis for further computational studies of the effect of nanostructure on adsorption, photochemistry, and nucleation of this material.
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Affiliation(s)
- S Hamad
- Davy Faraday Research Laboratory, The Royal Institution of Great Britain, 21 Albemarle Street, London W1S 4BS, United Kingdom
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