Artículo
TiO 2-photocatalytic reduction of pentavalent and trivalent arsenic: Production of elemental arsenic and arsine
Levy, Ivana Karina
; Mizrahi, Martin Daniel
; Ruano, Gustavo; Zampieri, Guillermo Enrique
; Requejo, Felix Gregorio
; Litter, Marta Irene
Fecha de publicación:
01/2012
Editorial:
American Chemical Society
Revista:
Environmental Science & Technology
ISSN:
0013-936X
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Heterogeneous photocatalytic reduction of As(V) and As(III) at different concentrations over TiO2 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 TiO2-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 TiO2, attention must be paid to formation of AsH3, one of the most toxic forms of As, and strategies for AsH3 treatment should be considered.
Palabras clave:
photocatalytic
,
TiO2
,
arsenic
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Articulos(CCT - PATAGONIA NORTE)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos(IIB-INTECH)
Articulos de INST.DE INVEST.BIOTECNOLOGICAS - INSTITUTO TECNOLOGICO CHASCOMUS
Articulos de INST.DE INVEST.BIOTECNOLOGICAS - INSTITUTO TECNOLOGICO CHASCOMUS
Articulos(INIFTA)
Articulos de INST.DE INV.FISICOQUIMICAS TEORICAS Y APLIC.
Articulos de INST.DE INV.FISICOQUIMICAS TEORICAS Y APLIC.
Articulos(SEDE CENTRAL)
Articulos de SEDE CENTRAL
Articulos de SEDE CENTRAL
Citación
Levy, Ivana Karina; Mizrahi, Martin Daniel; Ruano, Gustavo; Zampieri, Guillermo Enrique; Requejo, Felix Gregorio; et al.; TiO 2-photocatalytic reduction of pentavalent and trivalent arsenic: Production of elemental arsenic and arsine; American Chemical Society; Environmental Science & Technology; 46; 4; 1-2012; 2299-2308
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