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Abstract
Bacteria can fabricate platinum group metal (PGM) catalysts cheaply, a key consideration of industrial processes and waste decontaminations. Biorecovery of PGMs from wastes is promising but PGM leachates made from metallic scraps are acidic. A two-step biosynthesis ‘pre-seeds’ metallic deposits onto bacterial cells benignly; chemical reduction of subsequent metal from acidic solution via the seeds makes bioscaffolded nanoparticles (NPs). Cells of Escherichia coli were seeded using Pd(II) or Pt(IV) and exposed to a mixed Pd(II)/Pt(IV) model solution under H2 to make bimetallic catalyst. Its catalytic activity was assessed in the reduction of Cr(VI), with 2 wt% or 5 wt% preloading of Pd giving the best catalytic activity, while 1 wt% seeds gave a poorer catalyst. Use of Pt seeds gave less effective catalyst in the final bimetallic catalyst, attributed to fewer and larger initial seeds as shown by electron microscopy, which also showed a different pattern of Pd and Pt deposition. Bimetallic catalyst (using cells preloaded with 2 wt% Pd) was used in the hydrogenation of soybean oil which was enhanced by ~fourfold using the bimetallic catalyst made from a model waste solution as compared to 2 wt% Pd preloaded cells alone, with a similar selectivity to cis C18:1 product as found using a Pd-Al2O3 commercial catalyst.
Original language | English |
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Pages (from-to) | 359-368 |
Number of pages | 10 |
Journal | Microbial Biotechnology |
Volume | 11 |
Issue number | 2 |
Early online date | 28 Dec 2017 |
DOIs | |
Publication status | Published - 14 Feb 2018 |
ASJC Scopus subject areas
- Biotechnology
- Bioengineering
- Biochemistry
- Applied Microbiology and Biotechnology
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Dive into the research topics of 'Biorefining of platinum group metals from model waste solutions into catalytically active bimetallic nanoparticles'. Together they form a unique fingerprint.Projects
- 1 Finished
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Understanding bio-induced Selectivity in Nanoparticle Catalyst Manufacture
Wood, J. & Macaskie, L.
Engineering & Physical Science Research Council
1/11/10 → 31/10/13
Project: Research Councils