Green synthesis and applications of Au-Ag bimetallic nanoparticles
Green synthesis and applications of Au-Ag bimetallic nanoparticles
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DOI：
10.1016/j.saa.2014.08.079
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发表时间：
2015-02-25
影响因子：
4.4
通讯作者：
Philip, Daizy
中科院分区：
文献类型：
--
作者：
Kumari, M. Meena;Jacob, John;Philip, Daizy
本文首次报道了以石榴汁为原料在室温下合成双金属纳米粒子。不同摩尔比的金和银离子同时还原导致合金以及核壳纳米结构的形成。纳米粒子的特征在于使用紫外维斯光谱，透射电子显微镜，傅立叶变换红外光谱和X-射线衍射。合成的合金颗粒被用作催化剂在还原2-，3-，4-硝基苯酚为相应的胺和在降解甲基橙子。所有反应的还原动力学遵循伪一级。速率常数遵循k（4-硝基苯酚）< k（2-硝基苯酚）< k（3-硝基苯酚）的顺序。热导率作为体积分数的函数进行测量，并且观察到合金纳米颗粒的掺入增强了基础流体（水）的热导率，显示出纳米流体应用。该纳米粒子具有清除一氧化氮和羟自由基的活性，有望在生物医学领域得到应用。(c)2014爱思唯尔有限公司版权所有。
This paper reports for the first time the synthesis of bimetallic nanoparticles at room temperature using the fruit juice of pomegranate. Simultaneous reduction of gold and silver ions in different molar ratios leads to the formation of alloy as well as core-shell nanostructures. The nanoparticles have been characterized using UV vis spectroscopy, transmission electron microscopy, Fourier Transform Infrared Spectroscopy and X-ray diffraction. The synthesized alloy particles are used as catalysts in the reduction of 2-, 3-, 4-nitrophenols to the corresponding amines and in the degradation of methyl orange. The reduction kinetics for all the reactions follows pseudo-first order. The rate constants follow the order k(4-nitrophenol) < k(2-nitrophenol) < k(3-nitrophenol). Thermal conductivity is measured as a function of volume fraction and it is observed that the incorporation of the alloy nanoparticles enhances the thermal conductivity of the base fluid (water) showing nanofluid application. The nitric oxide and hydroxyl radical scavenging activity shown by the nanoparticles promise the potential application in biomedical field. (c) 2014 Elsevier B.V. All rights reserved.