Au@ZrO_2空心纳米微球的制备及其催化性质  

Preparation and Catalytic Properties of Au@ZrO_2 Hollow Microspheres

作　　者：向迎巧 黎甜甜 徐庆红[1] 

机构地区：[1]北京化工大学化工资源有效利用国家重点实验室,北京100029

出　　处：《无机化学学报》2017年第4期615-622,共8页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.U1362113)资助项目

摘　　要：以Stober法合成了不同粒径的SiO_2微球。以这些SiO_2微球为硬模板,通过ZrOCl_2前驱体吸附和水解制备得到了ZrO_2@SiO_2复合物,然后用HF溶解去除二氧化硅模板剂,制备得到ZrO_2空心球。以ZrO_2空心球为载体,采用沉积-沉淀法(DP)合成了Au@ZrO_2纳米空心微球。考察了Au@ZrO_2纳米空心微球在对硝基苯胺还原反应中的催化性能。研究结果表明,所合成的SiO_2微球粒径大小均一、形状规则、分散性好;ZrO_2空心微球大小及比表面积可以通过硬模板SiO_2微球粒径进行有效控制;与Au@ZrO_2实心微球相比,Au@ZrO_2空心微球在对硝基苯胺还原反应中表现出良好的催化性能,当反应温度为45℃、反应7 min时,对硝基苯胺能够完全转化为对苯二胺。SiO2 microspheres with different diameters were prepared by Stober method, and the SiO2 microspheres were uniformly coated with ZrO2 by adsorption and hydrolysis of ZrOCl2. The ZrO2 hollow microspheres were then obtained after SiO2 was removed by hydrofluoric acid, and Au@ZrO2 hollow microspheres were finally prepared by deposition-precipitation （DP） method. Catalytic properties of Au@ZrO2 hollow microspheres in reduction of paranitroaniline were studied carefully. The research results indicate that the SiO2 microspheres have regular shape and good dispersity. The sizes and the surface areas of the ZrO2 hollow microspheres could be controlled effectively by the diameters of SiO2 microspheres. Compared to the solid microsphere Au@ZrO2, the Au@ZrO2 hollow microspheres showed good catalytic performance in reduction of p-nitroaniline, and p-nitroaniline was completely reduced to p-phenylenediamine in 7 min at 45℃.

关 键 词：Au@ZrO2空心球 沉积-沉淀法 催化剂 对硝基苯胺 还原反应 

分 类 号：O611.4[理学—无机化学]