▎ 摘　　要

A nanocrystal sulfur/graphene composite has synthesized by one-pot hydrothermal method without any assistance of toxic organic solvents. Well dispersed sulfur particles (similar to 5 nm size) on graphene could be obtained by addition of acetic acid, and their chemical combination is confirmed by the presence of vibration stretching modes of C=S and C-S bonds, characterized by Fourier transform infrared and Raman spectra. Effective electrons can transfer from nano-sulfur to graphene verified by Fluorescence emission spectrum. The nanocomposite exhibits an enhanced photocurrent, lower onset potential and donor densities by electrochemical test. Besides, methylene blue (MB) degradation results indicate its excellent photocatalytic activities under no matter solar or visible light irradiation with graphene assistance, as well as excellent cycling stability.