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以聚噻吩磁性微珠PTh/Fe3O4(PF)为载体,采用低温水热法(170℃,pH=7±0.2)在其表面负载TiO2,制备了壳/壳/核结构的磁载光催化剂TiO2/PTh/Fe3O4(TPTF)。用透射电子显微镜(TEM)、X射线衍射仪(XRD)、傅里叶红外分光光度计(FT-IR)、振动样品磁强计(VSM)对催化剂的形貌、物相组成、表面性质、磁学性质进行了表征。以苯酚为模拟污染物,评价其光催化活性;通过自制的磁回收装置,考察其磁回收特性。结果表明,TiO2晶粒大小在4~6 nm之间,具有混晶结构(锐钛矿型占93.6%,金红石型占6.4%);当nTiO2∶n噻吩单体∶nFe3O4=75∶2.5∶1时,TPTF的催化活性最佳;P25、纯TiO2、TPTF(nTiO2∶n噻吩单体:nFe3O4=75∶2.5∶1)和TiO2/Fe3O4(TF)光催化降解苯酚的速率常数分别是0.0371、0.0302、0.0253和0.0106 min-1;TPTF循环使用5次,其反应速率常数、饱和磁化强度以及磁回收率为0.0205 min-1、1.59emu/g和89.3%,比第1次的0.0253 min-1、1.85 emu/g和94.7%略有降低。
The magnetic photocatalyst TiO2 with shell / shell / core structure was prepared by using polythiophene magnetic beads PTh / Fe3O4 (PF) as support and its surface was supported by low temperature hydrothermal method (170 ℃, pH = 7 ± 0.2) / PTh / Fe3O4 (TPTF). The morphology, phase composition, surface properties, surface area and surface morphology of the catalysts were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and vibrating sample magnetometer (VSM) The magnetic properties were characterized. Phenol was used as a model pollutant to evaluate its photocatalytic activity. The self-made magnetic recovery device was used to investigate its magnetic recovery characteristics. The results show that the grain size of TiO2 is 4 ~ 6 nm with mixed crystal structure (anatase type is 93.6% and rutile type is 6.4%). When nTiO2:n thiophene monomer: nFe3O4 = 75: 2.5: 1 , The catalytic activity of TPTF was the best. The rate constants of phenol degradation by P25, pure TiO2 and TPTF (nTiO2:n thiophene monomer: nFe3O4 = 75: 2.5: 1) and TiO2 / Fe3O4 (TF) were 0.0371 and 0.0302 , 0.0253 and 0.0106 min-1, respectively. The reaction rate constant, saturation magnetization and magnetic recovery of TPTF were 0.0205 min-1, 1.59 emu / g and 89.3% Slightly lower at 1.85 emu / g and 94.7%.