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采用自下而上方法制备了金-介孔二氧化硅复合纳米管,其中金纳米粒子作为催化剂嵌在介孔二氧化硅纳米管管壁内侧.金纳米颗粒的团聚、脱落和晶粒尺寸生长都可以被有效限制,而且催化剂负载量和尺寸大小均可实现简单控制.管壁中的介孔孔道、纳米管末端开口以及一维中空管道可以协同促进反应物扩散,从而提高4-硝基苯酚还原反应活性.循环实验证明这种复合纳米管催化剂具有良好的可重复使用性,而且在反应过程中未出现金纳米粒子脱落或团聚现象.
Gold-mesoporous silica composite nanotubes were prepared by the bottom-up method, in which gold nanoparticles were embedded in the inner wall of mesoporous silica nanotubes as gold nanoparticles.The agglomeration, detachment and grain size growth of gold nanoparticles Can be effectively limited, and the catalyst load and size can be easily controlled.Microporous channels in the tube wall, nanotube end openings and one-dimensional hollow tube can work together to promote the diffusion of reactants to improve 4-nitrophenol Reduction reaction activity.The cyclic experiments show that the composite nanotube catalyst has good reusability, and in the reaction process does not appear gold nanoparticles detachment or agglomeration phenomenon.