In this paper, the potentiometric titration and the sorption experiments were applied to investigate the biosorption behavior of Pb 2+ on Bacillus cereus biomass. It was shown that the biosorption capacities increased with increasing pH from 3 to 7, and the higher concentration of the biomass in solution was favorable to the sorption of Pb 2+ . Langmuir model simulated the adsorption data of Pb 2+ ion very well, and the saturated sorption capacity for Pb 2+ ion achieved 36 7mg·g ...