单分散AuPd合金纳米粒子的制备及对4-硝基酚的催化降解性能研究  

Preparation of AuPd nanoparticles by one-step displacement method and their catalytic properties

作　　者：刘军[1] 赖申枝 王建芬 赵一纯 LIU Jun;LAI shen-zhi;WANG Jian-fen;ZHAO Yi-chun(Department of Pharmaceutical and Biological Engineering,Hunan Chemical Vocational Technology College,Zhuzhou 412000,China)

机构地区：[1]湖南化工职业技术学院,制药与生物工程学院,湖南株洲412000

出　　处：《化学研究与应用》2022年第8期1770-1777,共8页Chemical Research and Application

基　　金：湖南省教育厅科学研究课题(20C0685)资助。

摘　　要：在室温条件下,以聚乙烯吡咯烷酮(PVP)作为稳定剂,以Mg粉作为还原剂,采用一步置换法制备AuPd和Au纳米粒子。通过透射电子显微镜(TEM)、X射线衍射(XRD)以及X-射线光电子能谱(XPS)等对该AuPd纳米粒子的性质进行了表征。结果表明,AuPd纳米粒子呈单分散态且能长时间稳定存在。采用不同摩尔比(3∶1,1∶1或1∶3)的金属离子前驱体AuCl_(4)^(-)和Pd^(2+),均可制备出单分散的AuPd纳米粒子。PVP对AuPd纳米粒子的稳定存在起关键作用。为对比AuPd催化活性,采用上述方法制备了单金属Au纳米粒子,所制备的AuPd以及Au纳米粒子对4-硝基苯酚(4-NP)的还原降解表现出优异的催化活性,其催化效率顺序为:Au_(1)Pd_(1)>Au_(3)Pd_(1)>Au_(1)Pd_(3)>Au。Au_(1)Pd_(1)纳米粒子循环使用5次后,其催化活性没有显著降低。The AuPd nanoparticles were prepared by one-step displacement method at room temperature.Herein,we used polyvinylpyrrolidone(PVP)as stabilizer and Mg powder as reducing agent.Characterization techniques such as transmission electron microscopy(TEM),X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS)were employed to verify the nature of the AuPd nanoparticles.The results showed that as-synthesized nanoparticles were well-dispersed and stable for a long time.Monodisperse AuPd nanoparticles with different composition can be prepared by using metal ion precursors with different molar ratios(3∶1,1∶1 or 1∶3).PVP played a key role in the stable existence of AuPd nanoparticles.Au nanoparticles were prepared by the same method in order to compare their catalytic activity.The as-synthesized materials presented excellent activities toward the reduction of 4-nitrophenol under ambient conditions.The catalytic efficiency of as-obtained nanoparticles takes the following order:Au_(1)Pd_(1)>Au_(3)Pd_(1)>Au_(1)Pd_(3)>Au.Au_(1)Pd_(1) was reusable for five consecutive cycles without a significant loss in its catalytic activity.

关 键 词：双金属纳米催化剂 置换反应 AuPd纳米粒子 对硝基苯酚的还原 

分 类 号：O614.1[理学—无机化学]