ZIF-67@PVP@Fe3O4复合材料的制备及催化性能研究

Preparation and Catalytic Property of ZIF-67@PVP@Fe3O4 Composite

该文首先通过简单的方法制备磁性纳米材料Fe3O4,然后在PVP材料联接作用下掺杂进多孔材料ZIF-67中制备了新型ZIF-67@PVP@Fe3O4复合材料。对该复合材料进行了充分的表征后,利用多孔、比表面积大、热/机械稳定性好、结构规整、活性位点多的ZIF-67与磁性纳米材料Fe3O4所表现出的协同作用,研究了该复合材料在环境污染物对硝基苯酚还原反应中的催化作用。结果表明,在该反应体系中添加ZIF-67@PVP@Fe3O4复合材料,与未添加催化剂以及只添加单一材料相比,响应灵敏度增强,反应速率加快,表现出最大的催化活性。另外该复合材料中因为添加了磁性纳米材料Fe3O4,所以有利于催化剂的回收再利用。对ZIF-67@PVP@Fe3O4复合材料进行了6次重复循环实验,催化效率仍维持在95%以上,表明该复合材料稳定性较好,有望发展成为有应用前景的环境污染物催化材料。

Magnetic material Fe3O4 was prepared by simple method,and then was doped successfully into the porous materials ZIF-67 by use of PVP as chelating agent.The phase and morphology of this material was characterized in details.Because of synergistic effect of multihole ZIF-67 with large specific surface area,good thermal/mechanical stability,uniform structure and magnetic nanomaterial Fe3O4,ZIF-67@PVP@Fe3O4 composite exhibited highest catalytic effect in the process of reduction of p-nitrophenol to p-aminophenol,compared with no catalyst and single materials.By utilizing the strong magnetism of magnetic material Fe3O4,it was easy to recycle and reuse as catalysts.The catalytic efficiency of composite remained above 95%by means of six continuous experiments.Therefore,this composite possesses the application prospect in the field of catalytic materials of environmental pollutants.