SiO_2@Fe_3O_4负载TiO_2光催化降解活性艳蓝X-BR性能研究

Catalysis property of TiO_2 loaded on the surface of SiO_2@Fe_3O_4 to brilliant blue X-BR

以Fe3O4为磁性内核,Si O2修饰的Fe3O4为载体,采用凝胶法制备核-壳结构的磁性Ti O2光催化剂,并以透射电镜(TEM)和磁强计(VSM)对产物进行表征。通过批处理试验研究了磁性Ti O2光催化剂对活性艳兰X-BR的光催化降解性能,结果表明所制备的磁性Ti O2光催化剂呈100-120 nm球状,分散性好,具有较好的磁性分离能力。催化剂与紫外光共处理活性艳兰X-BR的光催化降解率可达到90%以上,降解趋势符合一级和二级动力学拟合。考察了磁性Ti O2光催化剂的重复利用和催化能力的稳定性,能够满足磁性回收和再催化使用的要求。

The material of Si O2@ Fe3O4 was prepared by encapsulating Fe3O4 into silane using the St？ ber sol-gel process. Ti O2 loaded on the surface of Si O2@ Fe3O4（ FST） with core-shell structure was obtained by coating Ti O2 onto the surface of Si O2@Fe3O4. Transmission electron microscopy（ TEM） and magnetic curve experiments were carried out for characterizing FST. FST was of sphere shape with average diameter of 100-120 nm. The catalytic property of FST was investigated with high performance of the brilliant blue X-BR photolysis in terms of batch experiments. The brilliant blue X-BR can be photodegredated by 90% on the present of FST under irradiation of ultraviolet lamp. It also can be separated conveniently under the magnetic field. The high recoveries and stable catalytic capability of FST demonstrated that FST can be reused expediently.