Abstract
The influence of noncontrolled pH conditions on the kinetics of metal ion adsorption at solid/solution interfaces is studied by applying the SRT (statistical rate theory) approach. The quasi-equilibrium assumption inherent in SRT imposes the identical mathematical form of expressions for both the competitive adsorption and ion exchange models. However, they can be differentiated on the basis of a time-dependent profile of pH in the bulk solution. The developed model accounts for both multidentate binding mode and different proton/metal exchange ratios. Its applicability was shown by the quantitative analysis of the kinetic data reported by Choi and Yun.
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