CuO/TiO2 Photocatalyzed Oxidation of Cyclohexene with Molecular Oxygen Under the Promotion of Manganese Complexes
CuO-TiO2 composite oxide was prepared by a co-precipitation method using PEG6000 as a surfactant and copper acetate, NaOH and tetrabutyl orthotitanate as raw metarials, and then characterized by UV-Vis, nitrogen adsorption-desorption, XRD and TEM. The photocatalytic performance of CuO-TiO2 was investigated by the selective oxidation of cyclohexene with molecular oxygen under visible light irradiation. The results indicated that the CuO-TiO2 composite showed a slightly higher photocatalytic activtiy for this reaction than the corresponding pure metal oxides. Furthermore, the addition of metal complexes could promote the photocatalytic reaction to some extent, among the metal complexes examined, 8-hydroxylquinoline and especially its dibrominated derivative coordinated manganese complexes displayed an excellent promotion effect. Under the optimum reaction conditions, about 32.2% of cyclohexene was oxidized to form cyclohexenone, cyclohexenol and epoxycyclohexane.
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