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Zhang, Xingmiao; Chang, Xiaofeng; Gondal, M.A.; Zhang, Bin; Liu, Yousong; Ji, Guangbin
Applied surface science, 08/2012, Letnik: 258, Številka: 20Journal Article
► The graphene can accept the photoexcited electrons from BiOBr and thus inhibits the electron–hole recombination. ► The graphene significantly improved the photocatalytic activity under visible light irradiation. ► The photocatalytic activity of graphene/BiOBr strongly depend on the amount of graphene. The study presented in this work deals with the synthesis of graphene/BiOBr composite following hydrothermal reaction between graphene oxide and BiOBr. The results achieved demonstrated that the presence of graphene on the surface of BiOBr significantly improved the photocatalytic activity, under visible light irradiation, owing to the low isoelectric characteristics of graphene and better interfacial electron transfer between BiOBr and graphene. The effect of different amounts of graphene such as 1, 3, 6 and 10wt% on the photocatalytic and adsorption efficiency was investigated. Our results showed that there exists an optimum concentration of graphene (∼6wt%) for the best photocatalytic response of BiOBr which could be due to crucial energy dissipation. The photocatalytic and adsorption efficiency of the composites were investigated by studying the removal of Sulforhodamine 640 dye as a probe reaction.
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