期刊论文

Liu, Guangfei

Yang, H (reprint author), Dalian Univ Technol, Minist Educ, Key Lab Ind Ecol & Environm Engn, Dalian 116024, Peoples R China.

Yang, Hua,Wang, Jing,Jin, Ruofei,Zhou, Jiti,Lv, Hong

2010-11-01

BIORESOURCE TECHNOLOGY

SCIE、EI、PubMed、Scopus

J

101

21

8127-8131

0960-8524

Chromate; Mediated reduction; Redox mediator; Lawsone

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.