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。
SiO_2 microspheres with different diameters were prepared by Stober method, and the SiO_2 microspheres were uniformly coated with ZrO_2 by adsorption and hydrolysis of Zr OCl2. The ZrO_2 hollow microspheres were then obtained after SiO_2 was removed by hydrofluoric acid, and Au@ZrO_2 hollow microspheres were finally prepared by deposition-precipitation(DP) method. Catalytic properties of Au@ZrO_2 hollow microspheres in reduction of paranitroaniline were studied carefully. The research results indicate that the SiO_2 microspheres have regular shape and good dispersity. The sizes and the surface areas of the ZrO_2 hollow microspheres could be controlled effectively by the diameters of SiO_2 microspheres. Compared to the solid microsphere Au@ZrO_2, the Au@ZrO_2 hollow microspheres showed good catalytic performance in reduction of p-nitroaniline, and p-nitroaniline was completely reduced to pphenylenediamine in 7 min at 45 ℃.
引文
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