Reduction of Cr(VI) by Escherichia coli BL21 in the presence of redox mediators.

Reduction of Cr(VI) by Escherichia coli BL21 in the presence of redox mediators.
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在氧化还原介体存在下,大肠杆菌 BL21 还原 Cr(VI)。

DOI:
10.1016/j.biortech.2012.07.090
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发表时间:
2012-11
影响因子:
11.4
通讯作者:
Lin Yue
Lin Yue
中科院分区:
工程技术1区
文献类型:
--
作者:
Jianbo Guo;Jing Lian;Zhifang Xu;Zhenhua Xi;Jingliang Yang;William Jefferson;Chun Liu;Zaixing Li;Lin Yue

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选择蒽醌-2,7-二磺酸盐(2,7-AQDS)、蒽醌-1-磺酸盐(α-AQS)、蒽醌-2-磺酸盐(AQS)、蒽醌-2,6-二磺酸盐(AQDS)和蒽醌-1,5-二磺酸盐(1,5-AQDS)作为大肠杆菌BL 21还原Cr(VI)的氧化还原介质。在0.8mmoll−1AQS存在下,Cr(VI)的还原效率在7.5h内为98.5%,而在没有介质或存在α-AQS、1,5-AQDS、AQDS、2,7-AQDS的情况下,Cr(VI)的还原效率仅为21-34%。发现反应常数k(mg Cr(VI)g− 1干细胞重量h−1)和AQS浓度(CAQS)之间存在线性相关性,k= 0.768 CAQS +1.5531(R2=0.9935)。Cr(VI)的还原反应符合Arkenius方程,指前因子A = 13.249mg Cr(VI)g− 1/干电池重量h−1,活化能Ea = 28.01kJmol−1。葡萄糖为最佳碳源,最适pH为6.0。AQS获得的Cr(VI)还原率比常规的低厌氧还原率有显著提高。
Anthraquinone-2,7-disulfonate (2,7-AQDS), anthraquinone-1-sulfonate (α-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 coli BL21. In the presence of 0.8mmoll−1AQS, the Cr(VI) reduction efficiency was 98.5% in 7.5h, whereas it was only 21–34% in the absence of a mediator or in the presence of α-AQS, 1,5-AQDS, AQDS, 2,7-AQDS. A linear correlation, k=0.768CAQS+1.5531 (R2=0.9935), was found for the reaction constant, k (mg Cr(VI) g−1dry cell weight h−1) and the AQS concentration (CAQS). The Arrhenius equation described the Cr(VI) reduction in the tested temperature range, and the pre-exponential factor A was 13.249mg Cr(VI) g−1dry cell weight h−1,and the activation energy Ea was 28.01kJmol−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.
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