TiO 2-photocatalytic reduction of pentavalent and trivalent arsenic: Production of elemental arsenic and arsine

Heterogeneous photocatalytic reduction of As(V) and As(III) at different concentrations over TiO 2 under UV light in deoxygenated aqueous suspensions is described. For the first time, As(0) was unambiguously identified together with arsine (AsH3) as reaction products. As(V) reduction requires the pr...

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Autores principales:	Levy, Ivana Karina, Litter, Marta Irene
Publicado:	2012
Materias:	Aqueous suspensions Conduction band electrons Direct Reduction Electron donors Hydroxyl radicals Methanol Oxidation Photocatalytic process Photocatalytic reduction TiO Arsenic Methanol Suspensions (fluids) Titanium dioxide Water treatment arsenic arsine hydroxyl radical methanol titanium dioxide aqueous solution catalysis concentration (composition) electron oxidation photodegradation pollutant removal reduction titanium water treatment article concentration (parameters) photocatalysis solid ultraviolet radiation X ray absorption spectroscopy Arsenicals Catalysis Oxidation-Reduction Photochemical Processes Titanium Ultraviolet Rays Water Pollutants, Chemical
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0013936X_v46_n4_p2299_Levy http://hdl.handle.net/20.500.12110/paper_0013936X_v46_n4_p2299_Levy
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_0013936X_v46_n4_p2299_Levy
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spelling	paper:paper_0013936X_v46_n4_p2299_Levy2023-06-08T14:36:31Z TiO 2-photocatalytic reduction of pentavalent and trivalent arsenic: Production of elemental arsenic and arsine Levy, Ivana Karina Litter, Marta Irene Aqueous suspensions Conduction band electrons Direct Reduction Electron donors Hydroxyl radicals Methanol Oxidation Photocatalytic process Photocatalytic reduction TiO Arsenic Methanol Suspensions (fluids) Titanium dioxide Water treatment arsenic arsine hydroxyl radical methanol titanium dioxide aqueous solution arsenic catalysis concentration (composition) electron hydroxyl radical methanol oxidation photodegradation pollutant removal reduction titanium water treatment aqueous solution article concentration (parameters) electron photocatalysis reduction solid ultraviolet radiation X ray absorption spectroscopy Arsenic Arsenicals Catalysis Oxidation-Reduction Photochemical Processes Titanium Ultraviolet Rays Water Pollutants, Chemical Heterogeneous photocatalytic reduction of As(V) and As(III) at different concentrations over TiO 2 under UV light in deoxygenated aqueous suspensions is described. For the first time, As(0) was unambiguously identified together with arsine (AsH3) as reaction products. As(V) reduction requires the presence of an electron donor (methanol in the present case) and takes place through the hydroxymethyl radical formed from methanol oxidation by holes or hydroxyl radicals. On the contrary, As(III) reduction takes place through direct reduction by the TiO 2-conduction band electrons. Detailed mechanisms for the photocatalytic processes are proposed. Although reduction to solid As(0) is convenient for purposes of As removal from water as a deposit on TiO 2, attention must be paid to formation of AsH 3, one of the most toxic forms of As, and strategies for AsH3 treatment should be considered. © 2012 American Chemical Society. Fil:Levy, I.K. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Litter, M.I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0013936X_v46_n4_p2299_Levy http://hdl.handle.net/20.500.12110/paper_0013936X_v46_n4_p2299_Levy
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Aqueous suspensions Conduction band electrons Direct Reduction Electron donors Hydroxyl radicals Methanol Oxidation Photocatalytic process Photocatalytic reduction TiO Arsenic Methanol Suspensions (fluids) Titanium dioxide Water treatment arsenic arsine hydroxyl radical methanol titanium dioxide aqueous solution arsenic catalysis concentration (composition) electron hydroxyl radical methanol oxidation photodegradation pollutant removal reduction titanium water treatment aqueous solution article concentration (parameters) electron photocatalysis reduction solid ultraviolet radiation X ray absorption spectroscopy Arsenic Arsenicals Catalysis Oxidation-Reduction Photochemical Processes Titanium Ultraviolet Rays Water Pollutants, Chemical
spellingShingle	Aqueous suspensions Conduction band electrons Direct Reduction Electron donors Hydroxyl radicals Methanol Oxidation Photocatalytic process Photocatalytic reduction TiO Arsenic Methanol Suspensions (fluids) Titanium dioxide Water treatment arsenic arsine hydroxyl radical methanol titanium dioxide aqueous solution arsenic catalysis concentration (composition) electron hydroxyl radical methanol oxidation photodegradation pollutant removal reduction titanium water treatment aqueous solution article concentration (parameters) electron photocatalysis reduction solid ultraviolet radiation X ray absorption spectroscopy Arsenic Arsenicals Catalysis Oxidation-Reduction Photochemical Processes Titanium Ultraviolet Rays Water Pollutants, Chemical Levy, Ivana Karina Litter, Marta Irene TiO 2-photocatalytic reduction of pentavalent and trivalent arsenic: Production of elemental arsenic and arsine
topic_facet	Aqueous suspensions Conduction band electrons Direct Reduction Electron donors Hydroxyl radicals Methanol Oxidation Photocatalytic process Photocatalytic reduction TiO Arsenic Methanol Suspensions (fluids) Titanium dioxide Water treatment arsenic arsine hydroxyl radical methanol titanium dioxide aqueous solution arsenic catalysis concentration (composition) electron hydroxyl radical methanol oxidation photodegradation pollutant removal reduction titanium water treatment aqueous solution article concentration (parameters) electron photocatalysis reduction solid ultraviolet radiation X ray absorption spectroscopy Arsenic Arsenicals Catalysis Oxidation-Reduction Photochemical Processes Titanium Ultraviolet Rays Water Pollutants, Chemical
description	Heterogeneous photocatalytic reduction of As(V) and As(III) at different concentrations over TiO 2 under UV light in deoxygenated aqueous suspensions is described. For the first time, As(0) was unambiguously identified together with arsine (AsH3) as reaction products. As(V) reduction requires the presence of an electron donor (methanol in the present case) and takes place through the hydroxymethyl radical formed from methanol oxidation by holes or hydroxyl radicals. On the contrary, As(III) reduction takes place through direct reduction by the TiO 2-conduction band electrons. Detailed mechanisms for the photocatalytic processes are proposed. Although reduction to solid As(0) is convenient for purposes of As removal from water as a deposit on TiO 2, attention must be paid to formation of AsH 3, one of the most toxic forms of As, and strategies for AsH3 treatment should be considered. © 2012 American Chemical Society.
author	Levy, Ivana Karina Litter, Marta Irene
author_facet	Levy, Ivana Karina Litter, Marta Irene
author_sort	Levy, Ivana Karina
title	TiO 2-photocatalytic reduction of pentavalent and trivalent arsenic: Production of elemental arsenic and arsine
title_short	TiO 2-photocatalytic reduction of pentavalent and trivalent arsenic: Production of elemental arsenic and arsine
title_full	TiO 2-photocatalytic reduction of pentavalent and trivalent arsenic: Production of elemental arsenic and arsine
title_fullStr	TiO 2-photocatalytic reduction of pentavalent and trivalent arsenic: Production of elemental arsenic and arsine
title_full_unstemmed	TiO 2-photocatalytic reduction of pentavalent and trivalent arsenic: Production of elemental arsenic and arsine
title_sort	tio 2-photocatalytic reduction of pentavalent and trivalent arsenic: production of elemental arsenic and arsine
publishDate	2012
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0013936X_v46_n4_p2299_Levy http://hdl.handle.net/20.500.12110/paper_0013936X_v46_n4_p2299_Levy
work_keys_str_mv	AT levyivanakarina tio2photocatalyticreductionofpentavalentandtrivalentarsenicproductionofelementalarsenicandarsine AT littermartairene tio2photocatalyticreductionofpentavalentandtrivalentarsenicproductionofelementalarsenicandarsine
_version_	1768542062869741568

TiO 2-photocatalytic reduction of pentavalent and trivalent arsenic: Production of elemental arsenic and arsine

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