▎ 摘　　要

Intimately contacted TiO2 (nanoflake)/graphene composites were synthesized and doped with sulfur (S) at varying S/Ti molar ratios (RS/Ti) via a vapor-thermal method. S-doping led to a change in TiO2 morphology from nanoflakes to nanoparticles. The dopant S in TiO2 exhibits the multiple valence states of S2- (replacing O2-), namely S-0, S4+, and S6+ (replacing Ti4+), and introduces electronic states above the valence band of TiO2, simultaneously distorting the crystal lattice of TiO2. S-doping increases the degradation rate to methylene blue pollutant from 7.7 x 10(-2) min(-1) to 10.7 x 10(-2) min(-1) due to the increase in (OH)-O-center dot/O-center dot(2)- free radicals, which play an important role in methylene blue degradation.