以FeSO4·7H2O和Degussa P25型TiO2(P25 TiO2)为原料,通过原位生长法制备了具有高催化活性及铁磁性的Fe3O4负载TiO2催化剂(Fe3O4/TiO2)。采用高分辨透射电镜(HR-TEM),X射线衍射仪(XRD)和振动样品磁强计(VSM)对所得催化剂的结构和性能进行了表征。紫外光催化降解乙酸溶液的结果表明,Fe3O4/TiO2的催化活性是P25 TiO2的3倍左右。基于上述研究,构建了新型磁性定位光催化体系,通过对弱酸性黄G溶液催化降解的研究,表明即使在无搅拌的状态下,该复合粒子也具有较高的光催化活性,并且可以通过外界磁场有效地分离并加以回收利用,是较为理想的光催化剂。
Ferromagnetic Fe3O4/TiO2 nanoparticles are prepared by in-situ growth method using FeSO4O7H2O and TiO2 (Degussa P25) as starting materials. The sample is characterized by high-resolution transmission electron microscopy (HR-TEM), X-ray diffraction (XRD) and vibrating sample magnetometer (VSM). The photocatalytic degradation of acetic acid is investigated under UV light irradiation. The result indicates the photoactivity of Fe3O4/TiO2 nanoparticles is 3-fold higher than that of P25 TiO2. Thus, in this paper a novel magnetism oriented photocatalytic system (MOPS) is suggested. The results show that this system has excellent photoactivity for photodegradation of yellow-G without magnetic stirring. The photocatalyst can be removed easily from solution by magnetic force after the reaction.