Biosorption and Bioreduction of Trivalent Aurum by Photosynthetic Bacteria Rhodobacter capsulatus |
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Authors: | Youzhi Feng Yongchang Yu Yiming Wang Xiangui Lin |
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Affiliation: | (1) Laboratory of Biochemistry, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, Jiangsu, 210008, China;(2) Graduate School of the Chinese Academy of Sciences, Beijing, 100039, China |
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Abstract: | Biosorption has been shown to be an eco-friendly approach to remove heavy metal ions. In this study, the photosynthetic bacteria Rhodobacter capsulatus was screened and found to have strong ability to adsorb Au(III). The maximum specific uptake of living cells was over 92.43 mg HAuCl4/g dry weight of cell in the logarithmic phase. Biosorpion ability would be enhanced by an acidic environment. As the main cations, during biosorption the quantity of Mg2+ exchanged was more than Na+. Biosorbed Au(III) could be reduced by carotenoid and enzymes embedded and/or excreted by R. capsulatus, which might be the mechanism of photosynthtic bacteria metal tolerance. |
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Keywords: | Biosorption Bioreduction Gold Aurum Photosynthetic bacteria Rhodobacter capsulatus |
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