The formation and catalytic activity of silver nanoparticles in aqueous polyacrylate solutions  

作　　者：Jie Wang Jianjia Liu Xuhong Guo Liang Yan Stephen F. Lincoln 

机构地区：[1]State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China [2]Department of Chemistry, University of Adelaide, Adelaide, SA 5005, Australia

出　　处：《Frontiers of Chemical Science and Engineering》2016年第3期432-439,共8页化学科学与工程前沿（英文版）

基　　金：Acknowledgements 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.

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 carbox- ylate group concentrations were kept constant at 2.0× 10^-4 and 1.0 × 10^-2 mol·L^-1, respectively, while the ratio of [NaBH4]/[AgNO3] was varied from 1 to 100. The ultra- violet-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 obser- vations, 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.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 carbox- ylate group concentrations were kept constant at 2.0× 10^-4 and 1.0 × 10^-2 mol·L^-1, respectively, while the ratio of [NaBH4]/[AgNO3] was varied from 1 to 100. The ultra- violet-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 obser- vations, 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.

关 键 词：silver nanoparticles POLYACRYLATES catalysis mechanism sodium borohydride 

分 类 号：TQ325.7[化学工程—合成树脂塑料工业] TB383[一般工业技术—材料科学与工程]