Title: Biosorption of strontium ion by immobilised Aspergillus niger

Authors: Xiangliang Pan, Xianlin Meng, Daoyong Zhang, Jianlong Wang

Addresses: Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences, Urumuqi 830011, PR China; State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry Chinese Academy of Sciences, Guiyang 550002, PR China. ' Department of Environmental Science and Engineering, Harbin Institute of Technology, 202 Haihe Road, Nangang District, Harbin 150090, China. ' Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences, Urumuqi 830011, PR China; State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry Chinese Academy of Sciences, Guiyang 550002, PR China. ' Laboratory of Environmental Technology, INET, Tsinghua University, Beijing 100084, PR China

Abstract: Biosorption of strontium by Aspergillus niger immobilised in calcium alginate has been studied. The experimental data showed that immobilised A. niger was effective in removing Sr2+ from aqueous solution. The optimal pH and temperature were 3.0LC and 25LC, respectively. Pseudo second-order model was applicable to all the sorption data over the entire time range. Intraparticle diffusion was not the only rate-limiting step. Sorption data conformed well to both Langmuir and Freundlich isotherm model. The maximum adsorption capacity (qmax) niger was 751.88mg/g. The FT-IR analysis showed that the mechanism involved in biosorption of Sr2+ by A. niger was mainly attributed to Sr2+ binding of groups of amide groups I and II.

Keywords: Aspergillus niger; biosorption; heavy metals; immobilisation; strontium; calcium alginate; adsorption capacity.

DOI: 10.1504/IJEP.2009.025131

International Journal of Environment and Pollution, 2009 Vol.37 No.2/3, pp.276 - 288

Published online: 13 May 2009 *

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