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

Humphries, A.C.; 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.

DOI: https://doi.org/10.1023/b:bile.0000044457.80314.4d

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.

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