▎ 摘　　要

Ordered mesoporous indium dioxide (m-In2O3)/reduced graphene oxide (RGO) nanocomposites (m-In2O3-RGO) were prepared by a facile UV-assisted photoreduction method. The as-prepared samples were characterized by N-2 adsorption-desorption, X-ray diffraction, transmission electron microscopy, UV-Vis diffuse reflectance spectroscopy and photocurrent techniques. Photocatalytic properties of m-In2O3-RGO nanocomposite were studied under different conditions by using 4-chlorophenol (4-CP) as target pollutant under visible light irradiation. The results indicate that m-In2O3-RGO nanocomposite equip with high crystallinity and continuous pore channels, which provide a short distance for photogenerated charge carriers transfer. Simultaneously, RGO acts herein as a solid-state electron mediator, promoting the charge transportation and separation, as well as suppressing the electron-hole recombination in the composite. Under visible light irradiation, the photodegradation rate of 4-CP from the optimized photocatalyst containing ca. 2% (mass fraction) RGO reached to 96%. Meanwhile, the photocatalyst could be recycled several times without losing its photocatalytic performance.