Reduction of Cr((VI) by palladized biomass of Desulfovibrio vulgaris NCIMB 8303

被引：13
作者：
Humphries, AC [1 ]
Macaskie, LE [1 ]
机构：
[1] Univ Birmingham, Sch Biosci, Birmingham B15 2TT, W Midlands, England
来源：
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY | 2005年 / 80卷 / 12期
关键词：
bioinorganic catalyst; chromium; immobilization; kinetics;
D O I：
10.1002/jctb.1338
中图分类号：
Q81 [生物工程学（生物技术）]; Q93 [微生物学];
学科分类号：
071005 ; 0836 ; 090102 ; 100705 ;
摘要：
Palladized biomass of Desulfovibrio vulgaris (Bio-Pd(0)) reduced Cr(VI) to Cr(III) at an initial rate four-fold higher than chemically-prepared Pd(0) metal. Optimal Cr(VI) reduction by suspended Bio-Pd(0) occurred at pH 3, whereas pH did not affect the rate of Cr(VI) reduction by Bio-Pd(0) immobilized in agar beads. The rate of Cr(VI) reduction was concentration-dependent below 300 mu mol dm(-3), and application of enzyme kinetics, considering Bio-Pd(0) as an 'artificial enzyme', gave an apparent K-m (K-m (app)) of approx. 650 mu mol dm(-3) and V-max of 1667 nmol h(-1) mg Pd(0) for suspended Bio-Pd(0). The potential of Bio-Pd(0) as a method for the treatment of Cr(VI) -wastes is discussed. (c) 2005 Society of Chemical Industry.
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页码：1378 / 1382
页数：5
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