Photoelectrocatalytic Removal of Bromate Using Ti/TiO2 Coated as a Photocathode

Autor(es)

Monteiro Paschoal, Fabiana Maria ^[1] ; Pepping, Greg ^[2] ; Boldrin Zanoni, Maria Valnice ^[1] ; Anderson, Marc A. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, Dept Quim Analit, Inst Quim, BR-14801970 Araraquara, SP - Brazil

^[2] Univ Wisconsin, Environm Chem & Technol Prograrn, Madison, WI 53706 - USA

• Tipo de documento: Artigo Científico
• Fonte: Environmental Science & Technology; v. 43, n. 19, p. 7496-7502, OCT 1 2009.
• Citações Web of Science: 41

Resumo

These studies represent the rare use of a TiO(2) material as a photocathode and the first application of photoelectrocatalysis for BrO(3)(-) removal. Photoelectrocatalytic reduction of BrO(3)(-) to Br(-) can reach 70% at neutral pH under an applied potential of -0.20 V versus SCE (saturated calomel electrode) after 75 min on the irradiated nanoporous thin-film TiO(2)-Coated working electrode, which presented a flat band potential of -0.0274 V versus SCE. Regardless of the potential applied in these experiments, no BrO(3)(-) removal was observed in the counter electrode compartment or during electrolysis or photocatalysis, confirming that reduction of BrO(3)(-) to Br(-) requires the combination of a negative potential (ideally near -0.20 V) and ultraviolet irradiation of the Ti/TiO(2) electrode. The process was selective for BrO(3)(-) removal in that this process did not ;significantly reduce levels of Ca(2+) and Mg(2+) in drinking waters. (AU)

• Processo FAPESP: 04/07353-7 - Descoloracao e degradacao de corantes acidos usados em curtumes via oxidacao eletroquimica e fotoeletroquimica.
• Beneficiário: Fabiana Maria Monteiro Paschoal
• Modalidade de apoio: Bolsas no Brasil - Doutorado