Influence on Sorption Property of Pb by Fractal and Site Energy Distribution about Sediment of Yellow River

The pollution by heavy metal is a key factor for water quality in river, and the Pb has been closely attention in Yellow Basin. The heavy metals into river could be intensively absorbed by suspended sediment. The absorption processes of heavy metal by sediments of Yellow River were researched by batch experiment. The precision of simple dual-mode model to fit sorption isotherm curve of Pb2+ was better than other models. The fractal dimension D of sediment particle distribution and organic carbon affected the sorption parameters, the Kf of Freundlich model and k of Langmuir model increased along the fractal dimension D of sediment increasing, and n parameter of Freundlich model was negative relation with fractal dimension D. The different clay+silt content in sediment made different sediment structure maybe a brief reason. From site energy distribution, the high energy sites was preferentially occupied when the adsorption of Pb ion beginning, then, the high energy sites decreased and lower energy sites increased along with the sorption capacity increasing.