Department of Applied Chemistry, University of Johannesburg, 37 Nind Street, Doornfontein, Johannesburg 2028, South Africa.
Department of Applied Chemistry, University of Johannesburg, 37 Nind Street, Doornfontein, Johannesburg 2028, South Africa.
Carbohydr Polym. 2014 Nov 26;113:525-31. doi: 10.1016/j.carbpol.2014.07.047. Epub 2014 Jul 28.
We report a facile and green method to synthesise highly stable dispersions of platinum nanoparticles (PtNPs) with an average particle size of ∼ 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. GG-s-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.
我们报告了一种简便、绿色的方法，可在水相中合成具有平均粒径约为 6nm 的高度稳定的铂纳米粒子（PtNPs）分散体。天然、无毒、环保的生物聚合物瓜尔胶被用作还原剂和封端剂前体。用瓜尔胶稳定的 PtNPs（GG-s-PtNPs）通过紫外-可见光谱、XRD、TEM 和 XPS 进行了表征。与对氨基苯酚（p-AP）相比，GG-s-PtNPs 在液相还原对硝基苯酚（p-NP）方面表现出更好的催化活性。在室温下，总时间为 320s 时，p-NP 的催化还原效率达到 97%。还讨论了合成和催化还原 p-NP 的机制。这里提出的合成方法不需要严格的条件或有毒试剂，因此是一种简单、快速、高效、绿色的制备高活性催化剂的方法。
