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Reduction of Cr(VI) by Escherichia coli BL21 in the presence of redox mediators
Guo, Jianbo; Lian, Jing; Xu, Zhifang; Xi, Zhenhua; Yang, Jingliang; Jefferson, William; Liu, Chun; Li, Zaixing; Yue, Lin
2012
Source PublicationBIORESOURCE TECHNOLOGY
ISSN0960-8524
Volume123Pages:713-716
AbstractAnthraquinone-2,7-disulfonate (2,7-AQDS), anthraquinone-1-sulfonate (alpha-AQS), anthraquinone-2-sulfonate (AQS), anthraquinone-2,6-disulfonate (AQDS) and anthraquinone-1,5-disulfonate (1,5-AQDS) were selected as redox mediators for Cr(VI) reduction by Escherichia coil BL21. In the presence of 0.8 mmol l(-1) AQS, the Cr(VI) reduction efficiency was 98.5% in 7.5 h, whereas it was only 21-34% in the absence of a mediator or in the presence of alpha-AQS, 1,5-AQDS, AQDS, 2,7-AQDS. A linear correlation, k = 0.768C(AQs) + 1.5531 (R-2 = 0.9935), was found for the reaction constant, k (mg Cr(VI) g(-1) dry cell weight h(-1)) and the AQS concentration (C-AQS). The Arrhenius equation described the Cr(VI) reduction in the tested temperature range, and the pre-exponential factor A was 13.249 mg Cr(VI) g(-1) dry cell weight h(-1),and the activation energy Ea was 28.01 kJ mol(-1). Glucose was the best carbon sources, and the optimum pH was 6.0. The Cr(VI) reduction rate obtained with AQS is a significant improvement over low conventional anaerobic reduction rates. (C) 2012 Elsevier Ltd. All rights reserved.
Department环境水质学国家重点实验室
KeywordChromate Redox Mediator Anthraquinone-2-sulfonate (Aqs) Reduction
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Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/7795
Collection环境水质学国家重点实验室
Recommended Citation
GB/T 7714
Guo, Jianbo,Lian, Jing,Xu, Zhifang,et al. Reduction of Cr(VI) by Escherichia coli BL21 in the presence of redox mediators[J]. BIORESOURCE TECHNOLOGY,2012,123:713-716.
APA Guo, Jianbo.,Lian, Jing.,Xu, Zhifang.,Xi, Zhenhua.,Yang, Jingliang.,...&Yue, Lin.(2012).Reduction of Cr(VI) by Escherichia coli BL21 in the presence of redox mediators.BIORESOURCE TECHNOLOGY,123,713-716.
MLA Guo, Jianbo,et al."Reduction of Cr(VI) by Escherichia coli BL21 in the presence of redox mediators".BIORESOURCE TECHNOLOGY 123(2012):713-716.
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