Sorption and desorption behavior of lead on a Chinese kaolin

Shengli Wang; Zhongren Nan; Xinde Cao; Qin Liao; Jiao Liu; Wenfei Wu; Ting Zhou; Cuicui Zhao; Wangqiang Jin
May 2011
Environmental Earth Sciences;May2011, Vol. 63 Issue 1, p145
Academic Journal
The sorption and desorption of Pb on kaolin from Suzhou, China were investigated. The sorption experiment was conducted in a 0.01 M NaNO 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 NaNO 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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