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Influence of pH on Cadmium Removal by Mineral Adsorbent

The effect of pH on Cd adsorption was studied using red soil as an adsorbent in this study.The curve of Cd adsorbed vs pH showed that the adsorption amount increased slowly at low pH, then quickly with the increase of pH, and reached the maximum amount at high pH. The adsorption data at different pH values and initial Cd(II) concentrations were fitted well by Langmuir isotherm. At last, a pH-dependent model of adsorption isotherms of Cd was established by substituting the fitting results obtained from experimental data for the parameters in Langmuir equation.