Photoelectrocatalytic removal of bromate using Ti/TiO2 coated as a photocathode.
Environ Sci Technol
; 43(19): 7496-502, 2009 Oct 01.
Article
em En
| MEDLINE
| ID: mdl-19848167
These studies represent the rare use of a TiO2 material as a photocathode and the first application of photoelectrocatalysis for BrO3- removal. Photoelectrocatalytic reduction of BrO3- 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 TiO2-coated working electrode, which presented a flat band potential of -0.0274 V versus SCE. Regardless of the potential applied in these experiments, no BrO3- removal was observed in the counter electrode compartment or during electrolysis or photocatalysis, confirming that reduction of BrO3- to Br requires the combination of a negative potential (ideally near -0.20 V) and ultraviolet irradiation of the Ti/TiO2 electrode. The process was selective for BrO3- removal in that this process did not significantly reduce levels of Ca2+ and Mg2+ in drinking waters.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Titânio
/
Poluentes Químicos da Água
/
Bromatos
/
Purificação da Água
Idioma:
En
Revista:
Environ Sci Technol
Ano de publicação:
2009
Tipo de documento:
Article
País de afiliação:
Brasil
País de publicação:
Estados Unidos