期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 44, 期 16, 页码 6357-6363出版社
AMER CHEMICAL SOC
DOI: 10.1021/es100198v
关键词
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资金
- National Basic Research Program of China (973 Program) [2007CB815601, 2010CB933501]
- National Natural Science Foundation of China [40902097, 20803082, 40772034]
- Chinese Academy of Sciences [KJCX2 YW W01]
- Outstanding Youth Fund [10125523, 50625205]
- Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education [09ZXGK05]
Bioremediation of Cr(VI) through reduction relies on the notion that the produced Cr(III) may be precipitated or efficiently immobilized. However, recent reports suggest that soluble organo-Cr(III) complexes are present in various chromate-reducing bacterial systems. This work was designed to explore the factors that affect the immobilization of Cr(III) in the Ochrobactrum anthropi system X-ray absorption fine structure analysis on the cell debris clearly verified that coordination of Cr(III) occurs on the surfaces via the chelating coordination with carboxyl- and amido-functional groups However, competitive coordination experiments of Cr(III) revealed that the small molecules such as amino acids and their derivatives or multicarboxyl compounds hold stronger coordination ability with Cr(III) than with cell debris We speculate that it is the preferential coordination of Cr(III) to the soluble organic molecules in the bacterial culture medium that inhibits effective immobilization of Cr(III) on the cells On the basis of this understanding, a strategy with two-step control of the medium was proposed, and this achieved successful immobilization of Cr(VI) as Cr(III) by O anthropi and Planococcus citreus in 5-50 L pilot-scale experiments.
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