▎ 摘　　要

In this work, the synthesis of titanium dioxide@reduced graphene oxide (TiO2@rGO) nanocomposite as a photocatalyst for the degradation of phenol as a chemical pollutant of industrial wastewater was investigated. XRD, SEM, UV-Vis absorption spectra, and EIS were used to characterize the samples. In TiO2@rGO, the structural results revealed a significant combination of TiO2 and rGO. The optical characteristics revealed that Eg values for bare TiO2 and TiO2-rGO composites were 3.14 eV and 3.07 eV, respectively, which corresponded to the shrinking band gap value of TiO2-rGO nanocomposites. Because of the successful inclusion of rGO into the nanocomposite structure and the greater effective surface area, EIS evaluation revealed that TiO2-rGO had a greater specific capacitance than TiO2. Under UV irradiation for 35 minutes, photocatalytic tests revealed phenolic degradation efficiencies of 59.2% and 100% for bare TiO2 and TiO2-rGO composites, respectively. As a result, rGO considerably increased the degrading efficiency of bare TiO2. Furthermore, after 30 minutes of visible irradiation, the phenolic degradation efficiencies for bare TiO2 and TiO2-rGO composites were 44.1% and 100%, respectively, indicating that visual irradiation promotes the degradation rate for TiO2-rGO nanocomposites. As a consequence, TiO2-rGO nanocomposites not only were photoexcited in the UV region but their catalytic efficiency in the visible region was also delayed.