Abstract
Kinetics and thermodynamics of uptake of Cd2+ (in concentration of 10 and 50 mg/dm3) by natural and modified zeolite have been investigated. Kinetic data obtained are best described by the kinetic equation for the second order irreversible reactions and the equilibrium data obtained best fit to Freundlich adsorption isotherm. It has been found that (a) the ratio of wastewater to zeolite equal to 0.1 dm3: 1 g was the optimum, (b) use of zeolite with particles’ size <0.09 μm increased Cd2+ uptake, (c) Cd2+ removal due to zeolite's uptake was the highest if the pH value of water to be treated was in the range of pH 5–7, (d) uptake of Cd2+ was considerably decreased in presence of Ca2+ and Mg2+ in concentrations 2 folds the concentration of Cd2+, (e) zeolite treated with NaCl and CH3COONa showed the highest uptake ability, (f) concentrations lower than 0.5 and 8–10 mg/dm3 can be achieved by one stage treatment of soft water when the initial Cd2+ concentrations are 10 and 50 mg/dm3 correspondingly, and (g) contacting with 2 mol/dm3 NaCl solution can easily regenerate loaded zeolite.
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