文献类型：期刊文献

英文题名：The formation and catalytic activity of silver nanoparticles in aqueous polyacrylate solutions

作者：Wang, Jie[1];Liu, Jianjia[1];Guo, Xuhong[1];Yan, Liang[2];Lincoln, Stephen F.[2]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Univ Adelaide, Dept Chem, Adelaide, SA 5005, Australia

年份：2016

卷号：10

期号：3

起止页码：432

外文期刊名：FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING

收录：;EI(收录号：20163202700887);WOS:【SCI-EXPANDED(收录号:WOS:000382436900010)】；

基金：We gratefully acknowledge the National Natural Science Foundation of China (Grant Nos. 51403062 and 51273063), the China Scholarship Council, the Australian Research Council, China Postdoctoral Science Foundation (2013M541485), 111 Project Grant (B08021), the Fundamental Research Funds for the Central Universities and the Open Project of Engineering Research Center of Materials-Oriented Chemical Engineering of Xinjiang Bingtuan (2015BTRC001) for support of this work.

语种：英文

外文关键词：silver nanoparticles; polyacrylates; catalysis; mechanism; sodium borohydride

摘要：Silver nanoparticles (AgNPs) have been synthesized in the presence of polyacrylate through the reduction of silver nitrate by sodium borohydride in aqueous solution. The AgNO3 and polyacrylate carboxylate group concentrations were kept constant at 2.0 x 10(-4) and 1.0 x 10(-2) mol.L-1, respectively, while the ratio of [NaBH4]/[AgNO3] was varied from 1 to 100. The ultraviolet-visible plasmon resonance spectra of these solutions were found to vary with time prior to stabilizing after 27 d, consistent with changes of AgNP size and distribution within the polyacrylate ensemble occurring. These observations, together with transmission electron microscopic results, show this rearrangement to be greatest among the samples at the lower ratios of [NaBH4]/[AgNO3] used in the preparation, whereas those at the higher ratios showed a more even distribution of smaller AgNP. All ten of the AgNP samples, upon a one thousand-fold dilution, catalyze the reduction of 4-nitrophenol to 4-aminophenol in the temperature range 283.2-303.2 K with a substantial induction time being observed at the lower temperatures.