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Novel magnetically separable BiOBr/BiFeO 3  heterostructures were fabricated via a facile  in situ  hydrothermal chemical etching process using cetyltrimethyl-ammonium bromide (CTAB) and sulphuric acid as etching agents to react with BiFeO 3  particles. The effects of solution pH and CTAB amount on the structure, morphology, and optical properties of the as-prepared samples were investigated. It was found that the best acidity of solution is pH = 3.0 for the formation of BiOBr/BiFeO 3  heterostructures from BiFeO 3  powder. Their photocatalytic activities and anti-photocorrosion behaviour were measured by the photocatalytical reduction of heavy metal ion Cr (VI) under visible-light irradiation. Experimental results show that the molar ratio of BiOBr to BiFeO 3  contributed to different morphologies and photocatalytic activities of BiOBr/BiFeO 3  composites. The optimised molar ratio in BiOBr/BiFeO 3  composites was found to be 1:1. The photocatalytic reduction rate of Cr(VI) over 1:1 BiOBr/BiFeO 3  composites was found to be 4.9 and 3.0 times higher than that of pure BiFeO 3  and BiOBr, respectively. The hybridisation of BiOBr with BiFeO 3  can markedly inhibit the photocorrosion of semiconductor BiFeO 3 . No obvious catalytic activity decrement can be found after five consecutive photocatalytic Cr (VI) reduction, which demonstrates the high structural stability of 1:1 BiOBr/BiFeO 3 . Furthermore, a possible photogenerated charge transfer process was proposed. The obviously enhanced photocatalytic activity could be ascribed to the formation of BiOBr-BiFeO 3  heterojunction, accelerating the effective separation of photoexcited electron−hole pairs. This study suggests that the magnetically separable BiOBr/BiFeO 3  heterostructures can be a promising photocatalyst for environment-related applications.

materials technology

Controlled preparation of magnetically separable BiOBr/BiFeO 3  heterostructures by chemical etching process with enhanced visible light photocatalytic activities and anti-photocorrosion