Abstract
The adsorption characteristics of red clay, bentonite, bone char, modified red clay (97% red clay+3% bone char) and modified bentonite (97% bentonite+3% bone char) on Pb(II) were studied by batch test. Based on the experimental results, the Langmuir model and quasi second-order kinetic model were used to fit the experimental data. The results showed that the adsorption of Pb(II) by red clay, bentonite, and bone char is a rapid reaction process, and the adsorption capacity of bone char is significantly greater than that of red clay and bentonite. Langmuir model and quasi second-order kinetic model can be used to describe the isotherm adsorption and kinetic characteristics of red clay, bentonite and bone char, respectively. The adsorption capacity of the modified red clay or bentonite is significantly increased, and the adsorption capacity of the bentonite with 3% bone char is the best liner filler for Pb(II) pollutants.
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