华东理工大学学报（自然科学版）2018，Vol.44Issue(2)：145-149,5.DOI:10.14135/j.cnki.1006-3080.20170404002
环糊精原位还原法制备银纳米粒子及其催化性能
Synthesis and Catalytic Properties of Silver Nanoparticles Prepared by Cyclodextrin in-situ Reduction Method
摘要
Abstract
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.T herefore,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,called α-,β-and γ-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(cCD< 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 that β-and γ-CD-capped Ag-NP had a better catalytic activity than that of α-CD-capped Ag-NP.The activation energy of β-CD-capped Ag-NP in the reduction of 4-NP was calculated to be 48.1 kJ/mol,which is lower than that of α-and γ-CD-capped Ag-NP.关键词
环糊精/银纳米粒子/催化/对硝基苯酚Key words
cyclodextrin/silver nanoparticles/catalysis/4-nitrophenol分类
化学化工引用本文复制引用
邱志强,王杰,袁镇豫,史玉琳,郭旭虹..环糊精原位还原法制备银纳米粒子及其催化性能[J].华东理工大学学报（自然科学版）,2018,44(2):145-149,5.基金项目
国家自然科学基金(51403062) （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) （2014M561426）
