Calcium alginate immobilized konkoli leaves (KIL) was studied as a bio-sorbent for the sorption of Pb2+, Cd2+ and Zn2+ in aqueous solution. The sorption capacities for Pb2+, Cd2+ and Zn2+ were found to be 98.52, 90.1 and 81.34% respectively. The sorption behavior with respect to contact time, initial pH, ionic strength and initial metal ion concentration were investigated in order to determine the optimum sorption conditions. The result showed that the metal ion uptake by KIL decreases with increasing ionic strength while increase in initial metal ion concentration led to an increase in metal ion uptake. Maximum sorption was found to occur at pH 6 for Pb2+ and pH 5 for both Cd2+and Zn2+. The sorption capacity of KIL is encouraging and therefore may be used in the bio-remediation of wastewaters.
Key words: Konkoli leaves, immobilization, sodium alginate, sorption, metal ions.
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