金纳米通道制备及催化性能研究

Study on the Preparation and Catalytic Activity of Gold Nanotube

以聚碳酸酯超滤膜(PC膜)为模板,采用层-层自组装技术将聚乙烯亚胺(PEI)阳离子聚合物和柠檬酸根稳定的金纳米粒子(AuNPs)交替吸附在PC膜孔内制备了金纳米通道,并采用SEM对其进行了表征。以紫外-可见吸收光谱作为分析手段研究了金纳米通道对对硝基苯酚(4-NP)还原反应的催化性能。结果表明,金纳米通道具有良好的催化活性,催化效率随组装层数的增多出现先增大后降低的现象,PEI/AuNPs为三层时,金纳米通道具有较高的催化性能,且催化效率随4-NP+NaBH4混合溶液体系在金纳米通道内的流速增大而减小。

The gold nanotube was prepared using an alternating layer-by-layer assembly of positive charged poly(ethylenimine)(PEI)and negative charged AuNPs into a nanoporous polycarbonate(PC)membrane.The catalytic activity of gold nanotube on the reduction of 4-nitrophenol(4-NP)to 4-aminophenol(4-AP)by NaBH4 was studied using UV-Vis spectrophotometry.We inspected the influence on the catalytic efficiency of membrane assembly layers and system solution flow rate.The results showed that gold nanotube had better catalytic activityon the reduction of 4-NP to 4-AP.The best assembly layerofPEI/citr-AuNPswas three.Thecatalytic efficiency of membrane increased with the flow ratedecreasing of 4-NP+NaBH4.