In the present study, two biochars derived from Platanus orientalis Linn branches and leaves respectively were prepared by pyrolysis at the temperature of 500℃ under the oxygen-limited condition. The batch equilibration method was used to determine the effects of different factors, such as contact time, initial Pb²⁺ concentration and initial solution pH on Pb²⁺ adsorption capacity on the biochars. The characteristics of adsorption isotherms and adsorption kinetics were analyzed to reveal associated mechanisms. The results showed that the mineral elements and functional groups were more abundant in the leaf biochar than those in the branch biochar. The maximum adsorption of Pb²⁺ on both biochars occurred at the initial pH 5 after 24 hours, and the adsorption capacity of the leaf biochar was 25.6% greater than that of the branch biochar. The adsorption of Pb²⁺could be described well by the pseudo-second-order kinetics, indicating that the adsorption process was mainly controlled by precipitation. The adsorption isotherms demonstrated that the adsorption of Pb²⁺ to the biochars fitted Langmuir model better than Freundlich model. Therefore, monolayer adsorption was proposed as the dominant adsorption process, although the multilayer adsorption was also present. In conclusion, both biochars had good capacity for adsorption of Pb²⁺ in water, and the leaf biochar was more effective than the branch biochar.