Fe₃O₄@TiO₂ magnetic photocatalytic particles were synthesized and characterized. A composite PVDF separation membrane blended with Fe₃O₄@TiO₂ particles was prepared by the phase inversion method. The main purpose was to explore the effect of magnetic fields on the performance of membranes during coagulation bath. The structure characterization, permeability, interception ability, and anti-pollution performance of inorganic particle blend membranes were then tested. Results showed that magnetic field coagulation baths have little effect on the pore structure and hydrophilicity of the membrane surface. When the liquid membranes was condensed under a magnetic field, the magnetic photocatalytic particles could migrate at a greater rate to the surface of the membrane. Through performance tests of the PVDF modified membranes, it was found that a magnetic coagulation bath could promote more Fe₃O₄@TiO₂ to aggregate on the surface of the membrane, which led to the blend membrane formed under the magnetic coagulation bath had better antifouling performance against humic acid solution under ultraviolet light irradiation. Membranes with 0.5 wt% magnetic photocatalytic particles in a magnetic field coagulation bath performed best. When filtered under the condition of ultraviolet light, its pure water flux was 1752 L/(m² h), and the rejection rate of 20 mg/L humic acid solution was 67.17%. The flux attenuation before and after filtration was 38.84%, the flux recovery rate was 91.10%, and the irreversible pollution index was only 8.90%.

合成并表征了Fe ₃ O ₄ @TiO ₂磁性光催化颗粒。Fe ₃ O ₄ @TiO ₂共混的复合PVDF分离膜通过相转化法制备颗粒。主要目的是探讨在凝固浴过程中磁场对膜性能的影响。然后测试了无机颗粒共混膜的结构表征，渗透性，拦截能力和抗污染性能。结果表明，磁场凝固浴对膜结构的孔结构和亲水性影响很小。当液体膜在磁场下冷凝时，磁性光催化颗粒可以更大的速率迁移到膜表面。通过对PVDF改性膜的性能测试，发现磁凝浴可以促进更多的Fe ₃ O ₄ @TiO _2。膜表面聚集，从而导致在磁凝浴下形成的共混膜在紫外线照射下对腐殖酸溶液具有更好的防污性能。在磁场凝固浴中具有0.5 wt％磁性光催化颗粒的膜性能最好。在紫外光条件下过滤时，纯净水通量为1752 L /（m ²  h），腐殖酸溶液20 mg / L的去除率为67.17％。过滤前后的通量衰减为38.84％，通量回收率为91.10％，不可逆污染指数仅为8.90％。