▎ 摘　　要

This study used graphene-modified and unmodified rice straw, peanut shells, and corn straw biochar to investigate the impact of different cations concentrations of K+, Ca2+, Na+, and Mg2+ on cadmium sorption in solutions based on thermostatic adsorption experiments. Results showed that cations (K+, Ca2+, Na+, and Mg2+) inhibited cadmium adsorption on different biochar. The cadmium adsorption amount decreased with the increasing ionic strength. The adsorption capacity affected by Ca2+ was reduced by 13.2% 58.7%, much larger than the other three ions. The graphene-modified biochar performed better than the unmodified biochar. The inhibitory effect on cadmium sorption followed the descending sequence of Ca2+ > Mg2+ > K+> Na+. The cadmium adsorption also varied significantly with different materials of biochar.