Continuous removal of Cr (VI) from aqueous solution catalysed by palladised biomass of Desulfovibrio vulgaris

Humphries, A., Nott, K.P., Hall, L.D. and Macaskie, L.E. (2004) Continuous removal of Cr (VI) from aqueous solution catalysed by palladised biomass of Desulfovibrio vulgaris. Biotechnology Letters, 26 (19). pp. 1529-1532.

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Abstract

Growth-decoupled cells of Desulfovibrio vulgaris NCIMB 8303 can be used to reduce Pd(II) to cell-bound Pd(0) (Bio-Pd0), a bioinorganic catalyst capable of reducing hexavalent chromium to less toxic Cr(III), using formate as the electron donor. Magnetic resonance imaging showed that Bio-Pd0, immobilized in chitosan and agar beads, is distinguishable from the surrounding gel and is evenly dispersed within the immobilization matrix. Agar-immobilized Bio-Pd0 and `chemical Pd0' were packed into continuous-flow reactors, and challenged with a solution containing 100 μm Cr(VI) (pH 7) at a flow rate of 2.4 ml h−1. Agar-immobilized chemical Pd0 columns lost Cr(VI) reducing ability by 160 h, whereas columns containing immobilized Bio-Pd0 maintained 90% reduction until 680 h, after which reduction efficiency was gradually lost.

Item Type: Article
Divisions: Crop and Environment Sciences
Depositing User: Mr Darren Roberts
Date Deposited: 07 Nov 2018 10:28
Last Modified: 29 Nov 2018 14:18
URI: http://hau.repository.guildhe.ac.uk/id/eprint/16372

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