摘要
采用种子生长法制备了长径比约为4的金纳米棒(AuNRs),并将铂负载其两端制备出尖端Pt负载的纳米Au棒(Pt-AuNRs)。采用紫外-可见分光光度计、透射电子显微镜和X射线光电子能谱等一系列常规表征手段对AuNRs和Pt-AuNRs的物化性质进行表征及分析。研究AuNRs和Pt-AuNRs作为催化剂在NaBH4存在下催化还原4-硝基苯酚(4-NP)的性能。首次提出Pt-AuNRs催化还原4-NP机制。结果表明:500-Pt-AuNRs催化剂表现出最好的催化性能,速率常数Kapp=0.383 6 min^(-1),是AuNRs催化剂的4.7倍;Pt-AuNRs特殊的异质结构以及高表面活性和稳定性,有助于BH-4在其表面的高效吸附和电子转移。
Gold nanorods(AuNRs)with aspect ratio of about 4 were prepared by the seed growth method,and Pt were loaded on gold nanorods by KI etching method to prepare Pt-Au nanorods(Pt-AuNRs).A series of conventional characterizations like UV-Vis spectrophotometry,transmission electron microscopy,and X-ray photoelectron spectroscopy were used to identify the physicochemical properties of AuNRs and Pt-AuNRs.The catalytic reduction of 4-nitrophenol(4-NP)with AuNRs and Pt-AuNRs as catalysts in the presence of NaBH 4 was studied.The mechanism of Pt-AuNRs catalytic reduction of 4-NP was proposed for the first time.The results show that 500-Pt-AuNRs catalyst presents the best catalytic performance,and the rate constant K app=0.3836 min^(-1),which is 4.7 times that of AuNRs catalyst.The special heterostructure,high surface activity and stability of Pt-AuNRs contribute to the high adsorption and electron transfer of BH-4 on its surface.
作者
付云芝
陈笑霖
姚帅琪
FU Yunzhi;CHEN Xiaolin;YAO Shuaiqi(School of Chemistry and Chemical Engineering in Hainan University,Haikou 570228,China)
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2024年第1期176-181,共6页
Journal of China University of Petroleum(Edition of Natural Science)
基金
国家自然科学基金项目(22162009)。
