Lead and uranium sorption characteristics on hydrothermal synthesized delta manganese dioxide

In present paper, delta manganese dioxide is prepared with a hydrothermal method, and the adsorption is investigated with a batch method. The maximum sorption capacity for uranium and lead are calculated to be 41.32 and 492.61 mg g −1 respectively. Pseudo-second-order kinetic is proved to regulate the sorption kinetics, and Langmuir equation fits well with the isotherms. Results show that the mechanism of sorption is controlled by cation exchange and inner-sphere surface complexation. The study provides basic data for revealing the adsorption kinetics, rate-controlling mechanisms, and thermodynamic parameters of the adsorption process.