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Carbohydr Polym. 2018 Feb 15;182:61-68. doi: 10.1016/j.carbpol.2017.10.094. Epub 2017 Oct 31.

Gold nanoparticles stabilized by poly(4-vinylpyridine) grafted cellulose nanocrystals as efficient and recyclable catalysts.

Author information

1
Université Bordeaux, LCPO, UMR 5629, F-33600 Pessac, France; Department of Chemistry, Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada.
2
Université Bordeaux, LCPO, UMR 5629, F-33600 Pessac, France; CNRS, LCPO, UMR 5629, F-33600 Pessac, France. Electronic address: gilles.sebe@u-bordeaux.fr.
3
Department of Chemistry, Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada. Electronic address: xiaosong.wang@uwaterloo.ca.
4
Department of Chemical Engineering, Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, Ontario, N2L3G1, Canada. Electronic address: mkctam@uwaterloo.ca.

Abstract

pH-responsive poly(4-vinylpyridine) (P4VP) grafted cellulose nanocrystals (P4VP-g-CNC) were prepared by Surface-Initiated Atom Transfer Radical Polymerization (SI-ATRP) and subsequently used to stabilize gold nanoparticles (Au NPs) as efficient and recyclable nanocatalysts for the reduction of 4-nitrophenol (4NP). The presence of P4VP brushes on the CNC surface controlled the growth of Au NPs yielding smaller averaged diameter compared to Au NPs deposited directly on pristine CNC. The catalytic performances of pristine Au NPs, Au@CNC and Au@P4VP-g-CNC were compared by measuring the turnover frequency (TOF) for the catalytic reduction of 4NP. Compared to pristine Au NPs, the catalytic activity of Au@CNC and Au@P4VP-g-CNC were 10 and 24 times better. Moreover, the Au@P4VP-g-CNC material could be recovered via flocculation at pH>5, and the recycled nanocatalyst remained highly active.

KEYWORDS:

4-Nitrophenol; ATRP; Catalyst; Cellulose nanocrystals; Gold nanoparticles; Poly(4-vinylpyridine)

PMID:
29279126
DOI:
10.1016/j.carbpol.2017.10.094
[Indexed for MEDLINE]

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