Adsorption of leadII from aqueous solution onto

Authors: Lingzhi Huang Guangming Zeng Danlian Huang Lifeng Li Pengmian Huang Changbin Xia

Publish Date: 2009/03/07

Volume: 20, Issue: 5, Pages: 651-660

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Abstract

The adsorption of PbII onto Hydrilla verticillata was examined in aqueous solution with parameters of pH adsorbent dosage contact time and temperature The linear Langmuir and Freundlich models were applied to describe equilibrium isotherms and both models fitted well The monolayer adsorption capacity of PbII was found as 1042 mg/g at pH 4 and 25°C Dubinin–Radushkevich D–R isotherm model was also applied to the equilibrium data The mean free energy of adsorption 1581 kJ/mol indicated that the adsorption of PbII onto H verticillata may be carried out via chemical ionexchange mechanism Thermodynamic parameters free energy ΔG 0 enthalpy ΔH 0 and entropy ΔS 0 of adsorption were also calculated These parameters showed that the adsorption of PbII onto H verticillata was a feasible spontaneous and exothermic process in nature The influence of Cd2+ Cu2+ and Ni2+ on adsorption of Pb2+ onto H verticillata was studied too In the investigated range of operating conditions it was found that the existence of Cd 2+ Cu 2+ and Ni 2+ had no impact on the adsorption of Pb2+The study was financially supported by the Natural Foundation for Distinguished Young Scholars 50225926 50425927 the Chinese National Basic Research Program 973 Program 2005CB724203 the National 863 High Technology Research Program of China 2004AA649370 the National Natural Science Foundation of China 50608029 50808073 the National Natural Science Foundation of Hunan 08JJ3021 the Department of Education of Hunan Province 08C113 and the Program for Changjiang Scholars and Innovative Research Team in University IRT 0719

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