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以静电纺聚四氟乙烯(PTFE)超细纤维为载体,采用浸渍-烧结法制备出PTFE超细纤维负载二氧化钦(TiO_2)催化膜。研究了该催化膜在紫外光下,不同反应条件对亚甲基蓝的光催化降解性能影响,探讨了负载型TiO_2光催化剂的循环回收利用率。结果表明:通过浸渍-烧结法可以成功制备出PTFE超细纤维负载TiO_2光催化膜,经450℃煅烧后TiO_2为锐钛矿晶型;在波长为365 nm,功率为300 W的紫光灯照射55 min,浸渍负载5h制备的TiO_2/PTFE超细纤维催化膜对初始浓度为5 mg/L,体积100 ML的亚甲基蓝溶液催化降解除率可达99%;在经过5次循环后,催化剂对亚甲基蓝的降解率仍达46%,回收利用率较高。
Electrospun polytetrafluoroethylene (PTFE) ultrafine fibers were used as supports to prepare ultrafine PTFE supported TiO_2 catalytic membranes by impregnation-sintering. The effects of different reaction conditions on the photocatalytic degradation of methylene blue under UV light were studied. The recycling rate of supported TiO_2 photocatalysts was also discussed. The results show that the TiO 2 photocatalytic membrane supported on ultrafine PTFE fibers can be successfully prepared by impregnation-sintering method. The TiO 2 photocatalytic film is calcined at 450 ℃ and is anatase crystal. At a wavelength of 365 nm and a power of 300 W, min, and the catalytic degradation rate of the methylene blue solution with the volume of 100 ML was 99% for the TiO 2 / PTFE microfiber catalyst membrane prepared by immersion for 5 h. After 5 cycles, the catalytic activity of methylene blue The degradation rate is still up to 46%, higher recycling rate.