Abstract
The adsorptive removal of lead and cadmium ions from water using iron-coated sand (ICS) was investigated. Local natural sand (common constituent is SiO2) was subjected to surface modification as impregnated with iron. The performance of ICS, as a low-cost filter media, was tested in the removal of lead and cadmium ions from water. Effects of pH, initial ion strength contact time, and adsorbent dosage were studied in a batch mode. High removal efficiency could be obtained for both ions as 99.99% for Pb and 90% for Cd. Results were manipulated to describe the adsorption process using different models for equilibrium isotherms and kinetics. Experimental data fitted Freundlich isotherm and second-order kinetics for both heavy metals.
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