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Abstract

The potential of Peach Stones Activated Carbon (PSAC) waste as a low-cost biosorbent was investigated for removal of lead ions from aqueous solution. Various physico-chemical parameters were studied such as solution pH, biosorbent dose, metal ion concentration and contact time. The experimental results show that the percentage of biosorption increases with an increase in the biosorbent dose at optimum pH 5. 0. The adsorption equilibrium was achieved after 100 min. Generally the maximum percent removal of Pb(II) ion was 99.56% The equilibrium adsorption data were fi tted to Langmuir, Freundlich and Dubinin–Radushkevich (D-R) adsorption isotherm models and the model parameters were evaluated. All three models adequately describe adsorption data on to biomass of PSAC. Kinetic data were best described by the pseudo-second order model with high correlation coefficient (R 2 , 0.99). These results demonstrated that the PSAC could be used as a natural biosorbent for removal of lead ions from aqueous solution.