Lead removal from aqueous solution by employing natural brucite

Lei Shao, Jiwen Fu, Yue Zhou, Jianfeng Chen, and Shouci LuResearch Center of the Ministry of Education for High Gravity Engineering and Technology, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, ChinaCivil and Environmental Engineering School, University of Science and Technology Beijing, Beijing 100083, China

摘 要：<正> The effect and mechanism of the removal of Pb2+ from an aqueous solution by using brucite as the adsorbent were studied. It was revealed that the increase in pH of brucite suspension, as a result of the release of magnesium hydroxide into the suspension, leads to a sharp rise of the adsorption amount of Pb2+ on brucite. The synergism of buffering and adsorption capacities of brucite is responsible for the removal of Pb2+ from the aqueous solution. The coexistence of Cu2+ with Pb2+ causes a decrease of their adsorption on brucite due to a competition for surface sites and brucite exhibits a higher adsorption capacity for Pb2+ than for Cu2+. The percentage adsorption of Pb2+ on brucite could reach 96.38%, 97.20% and 94.09% respectively with the initial pH of the suspension pH, = 1.76 （initial Pb2+ concentration [Pb2+]i = 20 μmol/L）, 1.82 （[Pb2+]i = 100 μmol/L） and 1.84 （[Pb2+]i = 500 μmol/L）. It was concluded that brucite is a very efficient mineral adsorbent for Pb2+ removal from polluted acidic water

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