Abstract
The photocatalysis of bromate (BrO3−) attracts much attention as BrO3− is a carcinogenic and genotoxic contaminant in drinking water. In this work, TiO2-graphene composite (P25-GR) photocatalyst for BrO3− reduction were prepared by a facile one-step hydrothermal method, which exhibited a higher capacity of BrO3− removal than P25 or GR did. The maximum removal of BrO3− was observed in the optimal conductions of 1% GR doping and at pH 6.8. Compared with that without UV, the higher decreasing of BrO3− on the composite indicates that BrO3− decomposition was predominantly contributed to photo-reduction with UV rather than adsorption. This hypothesis was supported by the decreasing of [BrO3−] with the synchronous increasing of [Br−] at nearly constant amount of total Bromine ([BrO3−] + [Br−]). Furthermore, the improvement of BrO3− reduction on P25-GR was observed in the treatment of a tap water. However, the efficiency of BrO3− removal was less than that in deionized water, probably due to the consumption of photo-generated electrons and the adsorption of natural organic matters (NOM) on graphene.
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