Abstract
The sorption and desorption of Pb on kaolin from Suzhou, China were investigated. The sorption experiment was conducted in a 0.01 M NaNO3 aqueous solution with respect to the effects of initial Pb concentration, pH, solid/solution ratio, and temperature. Langmuir and Freundlich models well described equilibrium isotherms of Pb sorption. Less than 5% of Pb sorbed was desorbed with 0.01 M NaNO3 extraction, suggesting a dominant specific sorption of Pb. As the initial pH increased, the sorption of Pb on the kaolin increased. More than 60% of Pb was sorbed at pH 2.69 far below the point of zero net charge of the kaolin at 4.2, indicating a mechanism of Pb inner-sphere complex or by chemisorption. Lead sorption decreased with increasing temperature, indicating a process of exothermic sorption.
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Acknowledgments
The study was supported by the Fundamental Research Funds for Central Universities in Lanzhou University (lzujbky-2009-65), the National Environmental Protection Commonweal Project of China (No.200809098 and No.200909101), and the Foundation of Key Laboratory of Western China’s Environmental Systems (Ministry of Education) in Lanzhou University.
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Wang, S., Nan, Z., Cao, X. et al. Sorption and desorption behavior of lead on a Chinese kaolin. Environ Earth Sci 63, 145–149 (2011). https://doi.org/10.1007/s12665-010-0678-0
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DOI: https://doi.org/10.1007/s12665-010-0678-0