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Sorption and desorption behavior of lead on a Chinese kaolin
Authors:Shengli Wang  Zhongren Nan  Xinde Cao  Qin Liao  Jiao Liu  Wenfei Wu  Ting Zhou  Cuicui Zhao  Wangqiang Jin
Institution:(1) Key Laboratory of Western China’s Environmental Systems, Ministry of Education, Lanzhou University, Lanzhou, 730000, Gansu, People’s Republic of China;(2) College of Earth and Environmental Science, Lanzhou University, Lanzhou, 730000, Gansu, People’s Republic of China;(3) School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People’s Republic of China
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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