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Lead Removal from Aqueous Solutions Using Novel gel adsorbent Synthesized from Natural Condensed tannin

Chinese Journal of Chemical Engineering 2003年第4期11卷 426-430页

作者：占新民赵璇 AKANE Miyazaki YOSHIO Nakano State Key Joint Laboratory on Environment Simulation and Pollution Control Department of Environmental Science and Engineering Tsinghua University Beijing 100084 China Section of Environmental Technology Institute of Nuclear Energy Technology Tsinghua University Beijing 100084China Department of Environmental Chemistry and Engineering Interdisciplinary Graduate School of Science and Engineering Tokyo Institute of Technology Nagatsuta 4259 Midori-ku Yokohama 226-8502 Japan

Lead has caused serious environmental pollution due to its toxicity, accumulation in food chains and persistence in nature. In this paper, removal of lead from aqueous solutions is investigated using a novel gel adsorbent synthesized from natural condensed tannin. The novel adsorbent performs in aqueous solutions as a weak base with valid basic groups of 1.2mmol·g-1 tannin gel particles and therefore results in the elevation of pH value of aqueous solutions. Even when initial pH is 3.6, final pH at equilibrium can climb up to 6.5 that is above the pH value for Pb(OH)2 precipitation formation and then lead can be removed from wastewater by this so-called surface precipitation. The adsorption isotherm can be expressed by the Langmuir equation and the maximum capacity for adsorption of Pb is up to 92 mg·g-1 (based on dry adsorbent) when initial pH value is 3.6. Hence, the adsorbent does offer favorable properties in lead removal with respect to its high adsorption capacity at low initial pH value, which is advantageous to lead removal from acidic wastewater. A model is put forward to describe the individual adsorption phenomenon of the tannin gel adsorbent.

关键词： condensed tannin lead removal surface precipitation tannin gel adsorbent

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