▎ 摘　　要

TiO2/rGO nanocomposites are prepared by the solvothermal process using titanium sulfate and graphene oxide (GO) as raw materials utilized for the photodegradation of gaseous formaldehyde. Characterization by Fourier-transform infrared (FTIR) spectroscopy, Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) reveal that GO is partially reduced to reduced GO (rGO) and Ti-O-C bond is formed between TiO(2)and rGO. X-ray diffraction (XRD) confirms that the presence of anatase TiO2. High-resolution transmission electron microscopy (HRTEM) exhibits that TiO(2)nanoparticles with a diameter of approximate to 20 nm are uniformly loaded on the wrinkled rGO sheets. UV-vis spectroscopy reveals that the absorption intensity of TiO2/rGO increases with increasing GO content. Photoluminescence (PL) spectroscopy indicates that the ability of restraining electron-hole recombination initially increases with increasing GO content, followed by a gradual decrease. The TiO2/rGO nanocomposite (m(TiO2):m(GO) = 40:1) demonstrates optimal photocatalytic performance with formaldehyde degradation rate of 96% in 2 h and stable activity, which can be ascribed to the larger reduction of GO (76.19%), higher Ti-O-C bonds (17%), unfolded rGO sheets, and lower electron-hole recombination rate.