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以离子液体([C_4MIM]BF_4)为辅助剂、铁酸钴为磁核,用水热法制备了可磁分离TiO_2/CoFe_2O_4新型复合光催化材料。利用X射线衍射、N_2吸附-脱附和透射电子显微镜对样品进行表征;以亚甲基蓝溶液为模拟污染物,在模拟太阳光下考察样品光催化性能。结果表明:加入离子液体制备的TiO_2/CoFe_2O_4样品具有介孔结构,TiO_2稳定的包覆在CoFe_2O_4上,其比表面积可达238.3 m~2/g;在模拟太阳光下照射2 h,对亚甲基蓝的降解率可达97.9%。样品经磁场回收后重复使用3次光降解率为96.1%,依然保持较高的光催化活性。
A novel magnetically separable TiO 2 / CoFe 2 O 4 composite photocatalyst was prepared by hydrothermal method using ionic liquid ([C_4MIM] BF_4) as adjuvant and cobalt ferrite as magnetic core. The samples were characterized by X-ray diffraction, N 2 adsorption-desorption and transmission electron microscopy. The methylene blue solution was used as the simulated pollutant to investigate the photocatalytic activity of the sample under simulated sunlight. The results show that the TiO_2 / CoFe_2O_4 sample prepared by adding ionic liquid has a mesoporous structure, and the TiO_2 is coated on CoFe_2O_4 with a specific surface area of 238.3 m 2 / g. Under simulated sunlight for 2 h, Degradation rate up to 97.9%. The sample was reused three times after the magnetic field photodegradation rate was 96.1%, still maintain a high photocatalytic activity.