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Biotechnological synthesis of Pd/Ag and Pd/Au nanoparticles for enhanced Suzuki–Miyaura cross‐coupling activity

DOI: 10.1111/1751-7915.13762 DOI Help

Authors: Richard Kimber (University of Manchester) , Fabio Parmeggiani (University of Manchester) , Thomas S. Neill (University of Manchester) , Mohamed L. Merroun (University of Granada) , Gregory Goodlet (Johnson Matthey Technology Centre) , Nigel A. Powell (Johnson Matthey Technology) , Nicholas J. Turner (University of Manchester) , Jonathan R. Lloyd (University of Manchester)
Co-authored by industrial partner: Yes

Type: Journal Paper
Journal: Microbial Biotechnology , VOL 299

State: Published (Approved)
Published: March 2021
Diamond Proposal Number(s): 20618

Open Access Open Access

Abstract: Bimetallic nanoparticle catalysts have attracted considerable attention due to their unique chemical and physical properties. The ability of metal‐reducing bacteria to produce highly catalytically active monometallic nanoparticles is well known; however, the properties and catalytic activity of bimetallic nanoparticles synthesized with these organisms is not well understood. Here, we report the one‐pot biosynthesis of Pd/Ag (bio‐Pd/Ag) and Pd/Au (bio‐Pd/Au) nanoparticles using the metal‐reducing bacterium, Shewanella oneidensis, under mild conditions. Energy dispersive X‐ray analyses performed using scanning transmission electron microscopy (STEM) revealed the presence of both metals (Pd/Ag or Pd/Au) in the biosynthesized nanoparticles. X‐ray absorption near‐edge spectroscopy (XANES) suggested a significant contribution from Pd(0) and Pd(II) in both bio‐Pd/Ag and bio‐Pd/Au, with Ag and Au existing predominately as their metallic forms. Extended X‐ray absorption fine‐structure spectroscopy (EXAFS) supported the presence of multiple Pd species in bio‐Pd/Ag and bio‐Pd/Au, as inferred from Pd–Pd, Pd–O and Pd–S shells. Both bio‐Pd/Ag and bio‐Pd/Au demonstrated greatly enhanced catalytic activity towards Suzuki–Miyaura cross‐coupling compared to a monometallic Pd catalyst, with bio‐Pd/Ag significantly outperforming the others. The catalysts were very versatile, tolerating a wide range of substituents. This work demonstrates a green synthesis method for novel bimetallic nanoparticles that display significantly enhanced catalytic activity compared to their monometallic counterparts.

Subject Areas: Biology and Bio-materials, Chemistry

Instruments: B18-Core EXAFS

Added On: 07/04/2021 14:29


Discipline Tags:

Biotechnology Physical Chemistry Catalysis Chemistry Engineering & Technology Life Sciences & Biotech

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS)