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School of Biosciences, The University of Birmingham, Edgbaston, Birmingham B15 2TT, UK. L.E.Macaskie@bham.ac.uk
Bacterial hydrogenases have been harnessed to the removal of heavy metals from solution by reduction to less soluble metal species. For Pd(II), its bioreduction results in the deposition of cell-bound Pd(0)-nanoparticles that are ferromagnetic and have a high catalytic activity. Hydrogenases can also be used synthetically in the production of hydrogen from sugary wastes through breakdown of formate produced by fermentation. The Bio-H(2) produced can be used to power an electrical device using a fuel cell to provide clean electricity. Production of hydrogen from confectionery wastes by one organism (Escherichia coli) can be used as the electron donor for the production of Bio-Pd(0) from soluble Pd(II) by a second organism. The resulting Bio-Pd(0) can then be used as a bioinorganic catalyst in the remediation of Cr(VI)-contaminated solutions or polychlorinated biphenyls at the expense of Bio-H(2), as a hydrogenation catalyst for industry or as a component of a fuel cell electrode.
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