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Adsorption kinetics of Pb2+ and Cu2+ on variable charge soils and minerals: II. Equations for describing experimental data



Adsorption kinetics of Pb2+ and Cu2+ on variable charge soils and minerals: II. Equations for describing experimental data



Pedosphere 3(2): 161-172



Different mathematical methods were used to fit different kinetic equations, such as zero-order, second-order, parabolic-diffusion, Elovich, two-constant equations, to the experimental data of Pb2+ and Cu2+ adsorption on variable charge soils and kaolinite. Assuming each M2+ occupied two adsorption sites, two more equations, the so-called surface second-order equation and third-order equation were derived and compared with the above equations according to the fitting results.

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