【摘要】 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。更多还原

【Abstract】 A novel magnetically separable composite photocatalyst-titania(photoactive shell)/polythiophene(intermediate layer)/ferroferric oxide(magnetic core)(TiO2/PANI/Fe3O4,TPTF) was prepared by the low temperature hydrothermal method(170℃,pH = 7 ± 0. 2). The prepared samples were characterized by Xray diffraction(XRD),transm-ission electron microscopy(TEM),fourier infrared spectrophotometer(FT-IR) and vibrating sample magnetometer(VSM). The photocatalytic activity of the samples was determined by degradation of phenol and their magnetic recovery rate was determined by self-regulating magnetic recycling equipment. The results illustrated that TiO2is mixed crystal structure(anatase 93. 6%,rutile 6. 4%),and its particle size was 4 ~ 6 nm. The composite photocatalyst TPTF(nTiO2∶ nTh: nFe3O4is 75 ∶ 2. 5 ∶ 1) exhibited excellent shell/shell/core structure and superparamagnetism. The degradation to phenol followed psudo-first-order reaction kinetics and the reaction rate constant(K) of P25,pure TiO2,TPTF and TF were 0. 0371,0. 0302,0. 0253, 0. 0106 min-1,respectively. After recycling for 5 times,the reaction rate constant,saturation magnetization and magnetic recovery rate of TPTF reduced slightly from 0. 0253 min-1,1. 85 emu/g and 94. 7% to 0. 0205 min-1, 1. 59 emu/g and 89. 3%,respectively.更多还原