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

• Published in: Journal of chemical technology and biotechnology (1986) Vol. 80; no. 12; pp. 1378 - 1382
• Main Authors: Humphries, Andrea C, Macaskie, Lynne E
• Format: Journal Article
• Language: English
• Published: Chichester, UK John Wiley & Sons, Ltd 01-12-2005; Wiley
• Subjects: Biodegradation of pollutants; bioinorganic catalyst; Biological and medical sciences; Biotechnology; Catalysis; Catalytic reactions; Chemistry; chromium; Desulfovibrio vulgaris; Environment and pollution; Exact sciences and technology; Fundamental and applied biological sciences. Psychology; General and physical chemistry; immobilization; Industrial applications and implications. Economical aspects; kinetics; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Catalytic reaction; chromium; immobilization; bioinorganic catalyst; Palladium; Biocatalyst; Heavy metal; Chemical reduction; Transition metal Ions; Chromium VI Ions; Bacteria; Desulfovibrio vulgaris; kinetics; Platinoid; Entrapped microorganism
• ISSN: 0268-2575; 1097-4660
• DOI: 10.1002/jctb.1338

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 µmol dm−3, and application of enzyme kinetics, considering Bio‐Pd(0) as an ‘artificial enzyme’, gave an apparent Km (Kmapp) of approx. 650 µmol dm−3 and Vmax 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. Copyright © 2005 Society of Chemical Industry