期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 43, 期 19, 页码 7496-7502出版社
AMER CHEMICAL SOC
DOI: 10.1021/es803366d
关键词
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资金
- FAPESP [04/07353-7]
- CAPES
- CNPq
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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