▎ 摘　　要

In the catalytic process of semiconductor, the rapid recombination of electron-holes greatly reduces the catalytic activity of the semiconductor catalyst. In this study, a low-defect reduced hydroxylated graphene (RGOH) was used as a carrier material to prepare TiO2/reduced hydroxylated graphene (T/RGOH) nanocomposite photocatalyst by one-step hydrothermal method. The nanocomposite photocatalysts were used to degrade methylene blue (MB). The degradation efficiency of MB catalyzed by T/RGOH nanocomposite photocatalyst was about 48.5% higher than that of the pure TiO2, and about 19.7% higher than that of the TiO2/reduced graphene oxide (T/RGO) nanocomposite photocatalyst. This was because the electrical conductivity of RGOH was much higher than that of RGO, which greatly improved the separation and migration efficiency of photogenerated electronholes. At the same time, there might exist the Ti-O-C bond in the T/RGOH, which was advantageous to transfer photogenerated electrons through this bond to the RGOH flakes and prevented rapid recombination of photogenerated electron-holes. This study indicated that the preparation of catalyst nanocomposites using RGOH as carrier was an effective method to improve the catalytic performance of semiconductor catalysts.