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利用高热稳定性介孔TiO2粉体,采用室温冷冻干燥法制备了一种漂浮型二氧化钛陶瓷光催化剂。采用X射线衍射(XRD)、扫描电镜(SEM)、N2吸附脱附等方法对陶瓷的结构进行表征。结果表明,所制备的漂浮型二氧化钛陶瓷具有大孔/介孔的分级孔结构,并且TiO2陶瓷在800℃焙烧条件下仍然能够保持锐钛矿相。对浓度为15 mg·L-1的模拟污染物亚甲基蓝(MB)进行了光催化降解研究,其去除率可达到92.2%。催化剂在循环使用6次后,降解效果依然在92%以上。另外,采用该催化剂降解罗丹明B(RhB)、甲基橙(MO)和苯酚(PhOH),去除率可以分别达到92.7%、90.2%和94.6%,表明所制备的漂浮型分级孔二氧化钛陶瓷光催化剂在实际废水处理中将有很好的应用前景。
A kind of floating titanium dioxide ceramic photocatalyst was prepared by freeze-drying at room temperature using high thermal stability mesoporous TiO2 powder. The structure of the ceramic was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and N2 adsorption-desorption. The results show that the prepared titania ceramics have macroporous / mesoporous hierarchical pore structure, and TiO2 ceramics can still retain the anatase phase at 800 ℃. The photocatalytic degradation of methylene blue (MB), a simulated pollutant with a concentration of 15 mg · L-1, was studied. The removal rate was 92.2%. After the catalyst is recycled for 6 times, the degradation effect is still above 92%. In addition, the degradation rates of RhB, MO and PHOH were 92.7%, 90.2% and 94.6% respectively, which indicated that the prepared graded pore titanium dioxide ceramic light Catalyst in the actual wastewater treatment will have a good application prospects.