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Biosorption of strontium ion by immobilised Aspergillus niger

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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

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