点击次数：

论文类型：期刊论文

发表时间：2010-11-01

发表刊物：BIORESOURCE TECHNOLOGY

收录刊物：SCIE、EI、PubMed、Scopus

卷号：101

期号：21

页面范围：8127-8131

ISSN号：0960-8524

关键字：Chromate; Mediated reduction; Redox mediator; Lawsone

摘要：The reduction of Cr(VI) by resting Escherichia coli cells was significantly enhanced by the quinone redox mediators, lawsone, menadione, anthraquinone-2-sulfonate and anthraquinone-2,6-disulfonate. In the presence of 0.2 mM lawsone, over 97.5% Cr(VI) (100 mg l(-1)) was reduced in 4 h. The mediated reduction occurred at initial Cr(VI) concentrations of 50-250 mg l(-1), and increased with increasing initial biomass concentrations from 0.05 to 1.2 g l(-1). The addition of glucose as electron donor promoted the reduction process. Cu(2+), Ni(2+) and Co(2+) inhibited, whereas Mn(2+) and Pb(2+) stimulated reduction. Four rounds of mediated reduction were completed in 19 h, suggesting its stability and persistence. The efficient mediated microbial reduction of Cr(VI) is promising for rapid anaerobic removal of chromate. (c) 2010 Elsevier Ltd. All rights reserved.