Kinetic studies of oil bean seed shell in the adsorption of toxic heavy metals from their solutions

The unmodified and mercaptoacetic acid modified oil bean seed shells were used in the adsorption of Cd2+, Ni2+ and Pb2+ from their aqueous solutions. Adsorption was carried out in a batch process at various contact time with initial metal ions concentration of 100 mg/l using 1 g of 250 μm size of the shell at temperature of 25 0C and pH of 7.5. Adsorption equilibrium was established in about 10 minutes for the unmodified and 90 minutes for the modified. Kinetic studies revealed that the adsorption of some of the heavy metal ions by the oil bean seed shell fitted the Elovich adsorption model excellently except in the adsorption of Cd2+ by the unmodified shell that showed lower R2 value.

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