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01-05-2011 | Original Article | Issue 1/2011

Environmental Earth Sciences 1/2011

Sorption and desorption behavior of lead on a Chinese kaolin

Journal:
Environmental Earth Sciences > Issue 1/2011
Authors:
Shengli Wang, Zhongren Nan, Xinde Cao, Qin Liao, Jiao Liu, Wenfei Wu, Ting Zhou, Cuicui Zhao, Wangqiang Jin

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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