Photoelectrocatalytic removal of bromate using Ti/TiO2 coated as a photocathode.
Photoelectrocatalytic removal of bromate using Ti/TiO2 coated as a photocathode.
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DOI：
10.1021/es803366d
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发表时间：
2009-08
影响因子：
11.4
通讯作者：
F. Paschoal;Greg Pepping;M. Zanoni;M. Anderson
中科院分区：
文献类型：
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作者：
F. Paschoal;Greg Pepping;M. Zanoni;M. Anderson
这些研究代表了TiO2材料作为光电阴极的罕见使用，以及光电催化去除BrO3-的首次应用。在-0.20 V对饱和汞电极（SCE）作用75 min后，在中性pH下，纳米多孔薄膜tio2包覆的工作电极上，BrO3-光电催化还原成Br-的电位可达70%，其对SCE的平带电位为-0.0274 V。无论在这些实验中应用的电位如何，在对电极室中或在电解或光催化过程中都没有观察到BrO3-的去除，这证实了将BrO3-还原为Br需要Ti/TiO2电极的负电位（理想情况下接近-0.20 V）和紫外线照射的结合。该过程对BrO3-的去除是选择性的，因为该过程没有显著降低饮用水中Ca2+和Mg2+的水平。
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.