Journal of Chemical and Pharmaceutical Research (ISSN : 0975-7384)

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Original Articles: 2015 Vol: 7 Issue: 4

Removal of Pb(II) from aqueous solutions by citric acid modified Manilkara zapota leaves powder: Equilibrium and Kinetic studies

Abstract

The biosorption of Pb(II) from aqueous solutions onto Manilkara zapota leaves powder modified with citric acid treatment was investigated with respect to initial pH, contact time, initial metal ion concentration and biomass dosage. The adsorbent was characterized by Infrared Spectroscopy, X-ray diffraction, Scanning Electron Microscopy and Elemental analysis. Langmuir, Freundlich and Dubinin-Radushkevich (D-R) isotherm models were applied to describe the biosorption isotherms. Langmuir model provided the best correlation for the adsorption of Pb(II) by CAMMZL and the monolayer adsorption capacity was found to be 53.84 mg/g at pH 5.0 and 60 min equilibrium time. Experimental data was also tested in terms of biosorption kinetics using pseudo-first order, pseudo- second order and intra particle kinetic models. The results showed the pseudo second order model fits the experimental data very well with correlation coefficient greater than 0.999.Desorption experiments were carried out using dilute hydrochloric acid solution and the recovery of metal ions from CAMMZL was found 98 %. Desorption experiments showed the feasibility of regeneration of the adsorbent for further use after treating with dilute HCl.