▎ 摘　　要

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. (C) 2014 Published by Elsevier Ltd.