Process analysis of AuCl4− sorption leading to gold nanoparticle synthesis by Shewanella putrefaciens

Jeet Chandrakant Varia, Asfaw Zegeye, Sharon Velasquez-orta, Steve Bull

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)
27 Downloads (Pure)

Abstract

A process evaluation of AuCl4− (<300 mg/L, <pH 3, H2 e-donor) sorption kinetics and mass transfer analysis by initially viable Shewanella putrefaciens is presented here. Following on from previous reports of a thermodynamically spontaneous reaction, high sorption capacity of 1346 mg/g and significant evidence of zero valent gold nanoparticles (AuNPs) deposited within the bacterial cell wall. Linear and non-linearized kinetic modelling of the data shows a good fit to a pseudo second-order model and theoretical analysis of diffusional limiting steps suggest diffusion on the surface or through the cell wall to be the process rate limiting step. Process analysis of microbial gold synthesis, provides a foundation for the design of smart reactor systems for process intensification.
Original languageEnglish
Pages (from-to)482-488
JournalChemical Engineering Journal
Volume288
DOIs
Publication statusPublished - 15 Mar 2016
Externally publishedYes

Keywords

  • Shewanella
  • Au nanoparticles
  • Pseudo second-order
  • Kinetics
  • Diffusion bottlenecks

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