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

A study which showed that palladised bacterial biomass reduced the toxic hexavalent to trivalent chromium at a greater rate than chemically prepared palladium .

Year of Publication2005

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.

Citation

Humphries, A; Macaskie, L E (2005) "Reduction of Cr (VI) by palladised biomass of Desulfovibrio vulgaris NCIMB 8303"Journal of Chemical Technology and Biotechnology 80 (12) pp 1378-1382

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Supporting the development of the national rural economy.

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