A Novel Aerobic Mechanism for Reductive Palladium Biomineralization and Recovery by Escherichia coli

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Colleges, School and Institutes


Aerobically grown E. coli cells reduced Pd(II) via a novel mechanism using formate as the electron donor. This reduction was monitored in real-time using extended X-ray absorption fine structure. Transmission electron microscopy analysis showed that Pd(0) nanoparticles, confirmed by X-ray diffraction, were precipitated outside the cells. The rate of Pd(II) reduction by E. coli mutants deficient in a range of oxidoreductases was measured, suggesting a molybdoprotein-mediated mechanism, distinct from the hydrogenase-mediated Pd(II) reduction previously described for anaerobically grown E. coli cultures. The potential implications for Pd(II) recovery and bioPd catalyst fabrication are discussed.


Original languageEnglish
Pages (from-to)230-236
JournalGeomicrobiology Journal
Issue number3-4
Early online date25 Feb 2016
Publication statusPublished - 15 Mar 2016