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

Humphries, Andrea C and Macaskie, Lynne E (2005). Reduction of Cr(VI) by palladized biomass of Desulfovibrio vulgaris NCIMB 8303. Journal of Chemical Technology & Biotechnology, 80(12) pp. 1378–1382.

DOI: https://doi.org/10.1002/jctb.1338

Abstract

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 K_m (K_{m app}) of approx. 650 µmol 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.

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