Fabrication and characterisation of gold nano-particle modified polymer monoliths for flow-through catalytic reactions and their application in the reduction of hexacyanoferrate

Patrick Floris, Brendan Twamley, Pavel N. Nesterenko, Brett Paull, Damian Connolly

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Polymer monoliths in capillary (100 μm i.d.) and polypropylene pipette tip formats (vol: 20 μL) were modified with gold nano-particles (AuNP) and subsequently used for flow-through catalytic reactions. Specifically, methacrylate monoliths were modified with amine-reactive monomers using a two-step photografting method and then reacted with ethylenediamine to provide amine attachment sites for the subsequent immobilisation of 4 nm, 7 nm or 16 nm AuNP. This was achieved by flushing colloidal suspensions of gold nano-particles through each aminated polymer monolith which resulted in a multi-point covalent attachment of gold via the lone pair of electrons on the nitrogen of the free amine groups. Field emission scanning electron microscopy and scanning capacitively coupled conductivity detection was used to characterise the surface coverage of AuNP on the monoliths. The catalytic activity of AuNP immobilised on the polymer monoliths in both formats was then demonstrated using the reduction of Fe(III) to Fe(II) by sodium borohydride as a model reaction by monitoring the reduction in absorbance of the hexacyanoferrate (I{cyrillic, ukrainian}I{cyrillic, ukrainian}I{cyrillic, ukrainian}) complex at 420 nm. Catalytic activity was significantly enhanced on monoliths modified with smaller AuNP with almost complete reduction (95 %) observed when using monoliths agglomerated with 7 nm AuNPs. [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)249-256
Number of pages8
JournalMicrochimica Acta
Volume181
Issue number1-2
DOIs
Publication statusPublished - Jan 2014

Keywords

  • Agglomerated monolith
  • Flow-through catalysis
  • Micro-reactor
  • Nano-particles

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