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

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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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Autor principal: Levy, I.K
Otros Autores: Mizrahi, M., Ruano, G., Zampieri, G., Requejo, Félix Gregorio, Litter, M.I
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: 2012
Acceso en línea:Registro en Scopus
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Biblioteca Central Dr. Luis F. Leloir (FCEN) de Universidad de Buenos Aires
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024 7 |2 scopus  |a 2-s2.0-84857724453 
024 7 |2 cas  |a arsenic, 7440-38-2; arsine, 31219-53-1, 7784-42-1; hydroxyl radical, 3352-57-6; methanol, 67-56-1; titanium dioxide, 1317-70-0, 1317-80-2, 13463-67-7, 51745-87-0; Arsenic, 7440-38-2; Arsenicals; Titanium, 7440-32-6; Water Pollutants, Chemical; arsine, 7784-42-1; titanium dioxide, 13463-67-7 
030 |a ESTHA 
040 |a Scopus  |b spa  |c AR-BaUEN  |d AR-BaUEN 
100 1 |a Levy, I.K. 
245 1 0 |a TiO 2-photocatalytic reduction of pentavalent and trivalent arsenic: Production of elemental arsenic and arsine 
260 |c 2012 
270 1 0 |m Litter, M.I.; Gerencia Química, Comisión Nacional de Energía Atómica, Avenida General Paz 1499, 1650 San Martín, Prov. de Buenos Aires, Argentina; email: litter@cnea.gov.ar 
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506 |2 openaire  |e Política editorial 
520 3 |a 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.  |l eng 
593 |a Gerencia Química, Comisión Nacional de Energía Atómica, Avenida General Paz 1499, 1650 San Martín, Prov. de Buenos Aires, Argentina 
593 |a Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Rivadavia 1917, 1033 Ciudad Autónoma de Buenos Aires, Argentina 
593 |a Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón 2, 1428, Ciudad Autónoma de Buenos Aires, Argentina 
593 |a Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA-CONICET), Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Diag. 113 y 64, 1900 La Plata, Argentina 
593 |a Centro Atómico Bariloche, Comisión Nacional de Energía Atómica, Av. Bustillo 9500, 8400 Bariloche, Argentina 
593 |a Instituto Balseiro, Universidad Nacional de Cuyo, Av. Bustillo 9500, 8400 Bariloche, Argentina 
593 |a Instituto de Investigación e Ingeniería Ambiental, Universidad Nacional de General San Martín, Peatonal Belgrano 3563, 1650 San Martín, Provincia de Buenos Aires, Argentina 
690 1 0 |a AQUEOUS SUSPENSIONS 
690 1 0 |a CONDUCTION BAND ELECTRONS 
690 1 0 |a DIRECT REDUCTION 
690 1 0 |a ELECTRON DONORS 
690 1 0 |a HYDROXYL RADICALS 
690 1 0 |a METHANOL OXIDATION 
690 1 0 |a PHOTOCATALYTIC PROCESS 
690 1 0 |a PHOTOCATALYTIC REDUCTION 
690 1 0 |a TIO 
690 1 0 |a ARSENIC 
690 1 0 |a METHANOL 
690 1 0 |a SUSPENSIONS (FLUIDS) 
690 1 0 |a TITANIUM DIOXIDE 
690 1 0 |a WATER TREATMENT 
690 1 0 |a ARSENIC 
690 1 0 |a ARSINE 
690 1 0 |a HYDROXYL RADICAL 
690 1 0 |a METHANOL 
690 1 0 |a TITANIUM DIOXIDE 
690 1 0 |a AQUEOUS SOLUTION 
690 1 0 |a ARSENIC 
690 1 0 |a CATALYSIS 
690 1 0 |a CONCENTRATION (COMPOSITION) 
690 1 0 |a ELECTRON 
690 1 0 |a HYDROXYL RADICAL 
690 1 0 |a METHANOL 
690 1 0 |a OXIDATION 
690 1 0 |a PHOTODEGRADATION 
690 1 0 |a POLLUTANT REMOVAL 
690 1 0 |a REDUCTION 
690 1 0 |a TITANIUM 
690 1 0 |a WATER TREATMENT 
690 1 0 |a AQUEOUS SOLUTION 
690 1 0 |a ARTICLE 
690 1 0 |a CONCENTRATION (PARAMETERS) 
690 1 0 |a ELECTRON 
690 1 0 |a PHOTOCATALYSIS 
690 1 0 |a REDUCTION 
690 1 0 |a SOLID 
690 1 0 |a ULTRAVIOLET RADIATION 
690 1 0 |a X RAY ABSORPTION SPECTROSCOPY 
690 1 0 |a ARSENIC 
690 1 0 |a ARSENICALS 
690 1 0 |a CATALYSIS 
690 1 0 |a OXIDATION-REDUCTION 
690 1 0 |a PHOTOCHEMICAL PROCESSES 
690 1 0 |a TITANIUM 
690 1 0 |a ULTRAVIOLET RAYS 
690 1 0 |a WATER POLLUTANTS, CHEMICAL 
700 1 |a Mizrahi, M. 
700 1 |a Ruano, G. 
700 1 |a Zampieri, G. 
700 1 |a Requejo, Félix Gregorio 
700 1 |a Litter, M.I. 
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