Adsorption of some heavy and toxic metals in Thermaikos gulf sediments by surface complexation models: environmental impacts
Abstract
Adsorption of Cr, Cu,Zn, Ni and Cd on the surface of sea-sediments from Thermaikos gulf was studied as a function of pH, ionic strength and metal solution concentration. Furthermore, the charge development on the sediment's surface was studied in the pH range ~2,8 to ~10.0, by acid-basepotentiometric titrations. Both sediments exhibit low point of zero charge (pH<3.0). Metals adsorption curves, as a function of suspension pH, have a sigmoidal shape. the following selective adsorption sequence is evident: Cr>Cu>Zn>Ni>Cd. The increase of metal concentration, as well as the increase of ionic strength, shifts the adsorption curve in higher pH values. The sediment that has bigger surface area adsorbs the studied metalsin slightly lower pH values. Surface complexation models, such as Difusse Double Layer Model (DDLM) and Constant Capacitance Model (CCM), were applied to the experimental data of potentiometric titrations and adsorption of metals, using the least square optimization program ...
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