TiO_2-Fe_3O_4/MIL-101(Cr)磁性复合光催化材料的制备及其光催化性能

采用原位水热法合成了TiO_2-Fe_3O_4/MIL-101(Cr)磁性复合光催化材料,利用XRD、SEM、UV-Vis DRS、BET和磁学测量系统对复合光催化材料的结构和性能进行了表征,并以亚甲基蓝(MB)为模拟污染物,研究了该复合光催化材料的可见光催化活性,并考察了光催化材料的稳定性。结果表明:巯基官能化的Fe_3O_4和TiO_2与MIL-101(Cr)结合成功,复合后的TiO_2-Fe_3O_4/MIL-101(Cr)光催化材料的可见光响应范围得到明显拓宽;当TiO_2的添加量为400mg时所制得的磁性复合光催化材料具有相对较好的光催化降解效果,经过120min光照后,对MB的去除率高达80%;该磁性复合光催化材料具有良好的稳定性和磁分离性能。

Preparation and photocatalytic activity of magnetic TiO2-Fe3O4/MIL-101(Cr) composites

The magnetic TiO2-Fe3O4/MIL(Material Institute Lavoisier)-101(Cr) composites were synthesized via in situ hydrothermal method.The structure and performance of composites were characterized by XRD, SEM, UV-Vis DRS, BET and superconducting magnet system.The photocatalytic activity of TiO2-Fe3O4/MIL-101(Cr) composites were investigated by photocatalytic degradation of MB solution, and the stability of TiO2-Fe3O4/MIL-101(Cr) composites was also studied.The results show that the thiohydroxy-modified-Fe3O4 and thiohydroxy-modified-TiO2, can be successfully combined with MIL-101(Cr), and a notable absorption extension in the visible-light region can be observed for the TiO2-Fe3O4/MIL-101(Cr) composites.The TiO2-Fe3O4/MIL-101(Cr)(400) composite exhibits the highest photocatalytic activity, while the corresponding photodegradation efficiency for MB is 80% after 120 min irradiation.The TiO2-Fe3O4/MIL-101(Cr) composites also have a good stability and can be easily separated from solution by an external magnet.