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Biosorption of Hg~(2+) By Norcardia Amarae

WEI Dezhou, ZHU Yimin, SHEN Yanbai(School of Resources & Civil Engineering, Northeastern University, Shenyang 110004, China. Correspondent: ZHU Yimin, Email: yimin0508?@?yahoo.com)  
The biosorption of Hg2+ by the biomass of Norcardia amarae was studied, with the ξpotentialpH curve and isoeletric point of the biomass particulates measured. The experimental results show that the biomass of Norcardia amarae has a favorable biosorption effect on Hg2+. As a quick adsorption process, an equilibrium of the process can be got just in 2 minutes. The biomass of Norcardia amarae can remove over 96% Hg2+ in a broad range of pH value from 40 to 120, and begin to produce Hg(OH)2 when pH value120-at that moment the removing rate of Hg2+ is not only due to biosorption but to a combining effect of precipitation with biosorption. The removing rate is found highest at the adsorption temperature 23?℃. The removing rate of Hg2+ can be up to 97% if using the biomass to adsorb Hg2+ solution of concentration 400?mg/L. It is indicated that the isothermal point of the biomass is at pH=21, and the electrostatic adsorption is one of the influencing factors on the biosorption process.
【Fund】: 国家自然科学基金资助项目(50174014);; 辽宁省自然科学基金资助项目(20022025);; 辽宁省科技攻关项目(2001304024)·
【CateGory Index】: X172
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