采用离子液体辅助溶胶-凝胶法制备了可磁分离光催化材料 IL-TiO2/CoFe2 O4。采用 VSM、XRD、BET、TEM 表征样品的磁性能、结构和形貌。以亚甲基蓝为模拟污染物,在模拟太阳光下考察样品光催化性能。研究结果表明,样品 IL-TiO2/CoFe2 O4在350℃焙烧后具有介孔结构,比表面积达125.7 m2/g,远高于相同条件下无离子液体辅助制备样品TiO2/CoFe2O4(46.1 m2/g)的比表面积。在350℃焙烧温度下 IL-TiO2/CoFe2 O4光催化活性优于其它样品的光催化活性,是相同焙烧温度下 TiO2/CoFe2 O4光催化活性的6倍。IL-TiO2/CoFe2 O4磁饱和强度为2.19×10-2 T,可在外磁场作用下实现催化材料的回收,循环使用3次仍能保持良好的催化活性。
Mesoporous magnetic photocatalysts (IL-TiO2/CoFe2 O4 )were synthesized by a simple sol-gel meth-od using 1-butyl-3-methylimidazoliun tetrafluoroborate ([C4 MIM]BF4 )ionic liquid as template solvents.The magnetic properties,structure and morphology were characterized by vibrating sample magnetometer (VSM), X-ray diffraction (XRD),transmission electron microscopy (TEM)and brunauer-emmett-teller (BET)analy-sis.Photocatalytic activity of the samples was evaluated by photocatalytic degradation of methylene blue (MB). The results showed that with the assistance of ionic liquid,IL-TiO2/CoFe2 O4 was mesoporous structure after 350 ℃ calcination and the specific surface area of IL-TiO2/CoFe2 O4 was up to 125.7 m2/g,which was much higher than that synthesized without ionic liquid (TiO2/CoFe2 O4 ,46.1 m2/g).The photocatalytic activity of IL-TiO2/CoFe2 O4 was 6 times than that of TiO2/CoFe2 O4 when the calcination temperature was 350 ℃.The saturation magnetization of the samples was 2.19×10-2 T,which ensured the recovery of the photocatalytic materials under the influence of external magnetic field.The samples maintain good catalytic activity after recy-cled three times.
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