钛铁矿制备Fe_3O_4/TiO_2及光催化降解罗丹明B

Fabrication of Fe_3O_4/TiO_2 Composites from Ilmenite and Its Photocatalytic Degradation of Rhodamine B

以价廉易得的钛铁矿为原料,采用溶液法制备Fe_3O_4/TiO_2复合物.对该复合物的晶型、带隙宽度、比表面积及孔径分布等进行表征:产物为由面心立方结构Fe_3O_4和锐钛矿型TiO_2构筑的Fe_3O_4/TiO_2复合物,比表面积为29.26 m^2/g.以罗丹明B溶液的光催化降解为模型反应,研究了Fe_3O_4/TiO_2复合物的光催化性能及循环稳定性,结果表明,该复合物对罗丹明B有较好的催化降解效果,且优于纳米TiO_2;在外磁场作用下,可实现催化剂的分离、回收及再利用;通过磁性分离,催化剂重复利用5次后降解效果仍然达到95%以上.

The F%O4/TiO2 composite was prepared by the method of solution preparation. The XRD, UV-Vis, BET were used to prepare the ilmenite as the raw material. The results show that the products are Fe3 O4/TiO2 complexes composed of Fe304 and anatase TiO2, and the surface area of the composite is 29.26 m^2/g. The photo- catalytic degradation of rhodamine B solution was modeled and the ultraviolet lamp was used as the light source. The photocatalytie activity and cycling stability of Fe3 O4/TiO2 composite were studied. The results show that the complex has a good catalytic degradation. And the effect is better than that of nano-TiO2. Under the action of ex- ternal magnetic field, the separation, recovery and reutilization of the catalyst can be effectively realized. After the catalyst is reused for 5 times, the degradation effect is over 95 %.