Journal
CARBOHYDRATE POLYMERS
Volume 113, Issue -, Pages 525-531Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2014.07.047
Keywords
Biopolymer; Guar gum; Metal nanoparticle; Green method; Catalysis; p-Nitrophenol
Categories
Funding
- National Research Foundation (NRF)
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We report a facile and green method to synthesise highly stable dispersions of platinum nanoparticles (PtNPs) with an average particle size of similar to 6 nm. Natural, nontoxic, eco-friendly biopolymer guar gum was utilised as both the reducing and capping agent precursor in aqueous medium. The PtNPs that had been stabilised by guar gum (GG-s-PtNPs) were characterised by UV-vis spectroscopy, XRD, TEM and XPS. GGs-PtNPs performed better in terms of catalytic activity for the liquid phase reduction of p-nitrophenol (p-NP) compared to p-aminophenol (p-AP). The efficiency of the catalytic reduction of p-NP over GG-s-PtNPs was found to be 97% in a total time of 320 s at room temperature. The mechanisms of the synthesis and catalytic reduction of p-NP are also discussed.The synthesis approach presented here does not require stringent conditions or toxic agents and thus is a straightforward, rapid, efficient, and green approach to the fabrication of highly active catalysts. (C) 2014 Elsevier Ltd. All rights reserved.
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