文献类型：期刊文献

中文题名：环糊精原位还原法制备银纳米粒子及其催化性能

英文题名：Synthesis and Catalytic Properties of Silver Nanoparticles Prepared by Cyclodextrin in-situ Reduction Method

作者：邱志强[1];王杰[1];袁镇豫[1];史玉琳[1];郭旭虹[1]

机构：[1]华东理工大学化学工程联合国家重点实验室,上海200237

年份：2018

卷号：44

期号：2

起止页码：145

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：CSTPCD;;Scopus;北大核心:【北大核心2017】；CSCD:【CSCD_E2017_2018】；

基金：国家自然科学基金(51403062);中央高校基本科研业务费探索研究专项基金;中国博士后科学基金(2014M561426)

语种：中文

中文关键词：环糊精;银纳米粒子;催化;对硝基苯酚

外文关键词：cyclodextrin;silver nanoparticles;catalysis;4-nitrophenol

摘要：利用环糊精(CD)在碱性溶液中原位还原硝酸银制得环糊精包覆的银纳米粒子,并通过透射电镜、红外光谱和紫外分光光度计对其进行表征。实验结果表明,在适当的pH和环糊精浓度下制备得到的银纳米粒子的粒径很均一,但是碱性过强(pH>12)或环糊精浓度太低(cCD<0.025mmol/L)会导致银纳米粒子团聚。在对硝基苯酚的还原实验中发现环糊精包覆的银纳米粒子具有很好的催化活性,而且β-环糊精和γ-环糊精包覆的银纳米粒子的催化活性高于α-环糊精包覆的银纳米粒子。
Metal nanoparticles exhibited different physicochemical properties as compared to their bulk materials due to their high surface-to-volume ratio,which had a broad application prospect.However,the tendency of aggregation of nanoparticles must be overcome by using suitable capping agents.The capping agents played a significant role in stabilizing the metal nanoparticles and influenced their catalytic performance.Therefore,it’s necessary to find the proper capping agents of metal nanoparticles.A facile and effective method to produce silver nanoparticles(Ag-NPs)in a water solution was reported.Cyclodextrin(CD),a soluble nontoxic molecule,was made up of six,seven,or eight glucose units,calledα-,β-andγ-CD,respectively.Due to their unique hydrophobic cavities,CDs were used as an eco-friendly capping agent to stabilize the Ag-NPs by the hydrophobic interactions with the apolar primary faces of CD.In this paper,CD-capped silver nanoparticles were synthesized in an alkaline aqueous solution by reducing silver nitrate with CD and the synergetic catalytic effect between Ag-NP and different kinds of CDs was investigated.Then TEM,FT-IR and UV-vis spectroscopy were employed to characterize the synthesized Ag-NP.It was revealed that the size distributions of Ag-NP prepared in proper pH and CD concentration were quite uniform and could be controlled(10-30 nm).And a higher pH(pH>12)or lower CD concentration(c CD<0.025 mmol/L)would lead to the aggregation of Ag-NP during the synthesis procedure.Recently,it was reported that the CDs and Ag-NP had cooperative catalytic activity during the 4-nitrophenol(4-NP)reduction reactions.During the reaction,the CD-capped Ag-NP had a strong catalytic effect on the reduction of 4-NP,and it was found thatβ-andγ-CD-capped Ag-NP had a better catalytic activity than that ofα-CD-capped Ag-NP.The activation energy ofβ-CD-capped Ag-NP in the reduction of 4-NP was calculated to be 48.1 kJ/mol,which is lower than that ofα-andγ-CD-capped Ag-NP.