Preparation and property of magnetic photocatalyst BiOCl/MnxZn1-xFe2O4

摘要

The magnetic photocatalyst BiOCl/MnxZn1-xFe2O4 was prepared by impregnation-calcination method. The structure and properties of the prepared photocatalyst were characterized by FTIR, XRD, SEM, TEM, UV-vis DRS, and VSM. MnxZn1-xFe2O4 inhibited the growth along (001) crystal face and promoted (110) crystal surface exposure of BiOCl. The asprepared magnetic composite appeared flower-like microspheres assembled with nanosheets. The average crystallite size and the nanosheet thickness range of BiOCl/MnxZn1-xFe2O4 were 57.6 and 75.7-112.2 nm, respectively. The band gap energy (E-g) of BiOCl/MnxZn1-xFe2O4 was 2.48 eV, which was lower than that of BiOCl. The saturation magnetization (Ms), coercive force (Hc), and remanent magnetization (Mr) of BiOCl/MnxZn1-xFe2O4 were respectively 4.64 emu g(-1), 50.12 G and 0.09 emu g(-1), indicating a good resistance to demagnetization and paramagnetism. The optimum synthesis condition of BiOCl/MnxZn1-xFe2O4 was obtained by orthogonal experiments, and the degradation ratio of RhB with the photocatalyst was 99.6 at 30 min. After four cycles, the degradation ratio of RhB with the recovered photocatalyst was still above 83.