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| Effect of microorganisms on adsorption capacities of Pb and Cd on main chemical components in sediments |
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Abstract The effect of microorganisms on physical and chemical characteristics of main chemical components in sediments and the mechanism were studies by analyzing surface areas and adsorption capacities of Pb and Cd on the composites of Fe and Mn oxides and humic acid with microorganisms in Songhua River. Surface area of Mn oxides was larger than Fe oixdes and humic acid, and all of them increased on different degrees after combined with microorganisms. But surface areas of three materials were not direct proportion to the adsorption capacities of Pb and Cd, which were mainly atributed to different adsorption mechanisms of heavy metals on them. The adorption capacities of the composites could not predicted by the addition model, namely that adsorption amounts of the composites were less than the sum of each component, indicating that the microorganisms coverd parts of surface functional groups of Fe and Mn oxides and humic acid.
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Received: 30 May 2010
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