聚四氟乙烯超细纤维负载二氧化钛光催化性能

第44卷第1期2016年1月硅酸盐学报Vol.44，No.1January，2016JOURNALOFTHECHINESECERAMICSOCIETYhttp://www.gxyb.cbpt.cnki.netDOI：10.14062/j.issn.0454-5648.2016.01.14聚四氟乙烯超细纤维负载二氧化钛光催化性能陶丽琴，赵义侠，康卫民，程博闻，乔春梅(天津工业大学，省部共建分离膜与膜过程国家重点实验室，天津300387)摘要：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钛(TiO2)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TiO2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TiO2光催化膜，经450℃煅烧后TiO2为锐钛矿晶型；在波长为365nm，功率为300W的紫光灯照射55min，浸渍负载5h制备的TiO2/PTFE超细纤维催化膜对初始浓度为5mg/L、体积100mL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。关键词：聚四氟乙烯超细纤维；二氧化钛；电纺；光催化中图分类号：TQ134.1+1文献标志码：A文章编号：0454–5648(2016)01–0089–06网络出版时间：2015-12-2305:19:59网络出版地址：http://www.cnki.net/kcms/detail/11.2310.TQ.20151223.1719.014.htmlPreparationofTitaniumDioxideLoadedonPolytetrafluoroethyleneSuperfine-fiberandItsPhotocatalyticPerformanceTAOLiqin,ZHAOYixia,KANGWeimin,CHENGBowen,QIAOChunmei(StateKeyLaboratoryofSeparationMembranesandMembraneProcesses,Tianjin300387,China)Abstract:Polytetrafluoroethylene(PTFE)nanofiberswerepreparedbyanelectrostaticspinningtechnology.Titaniumdioxide(TiO2)particleswereloadedonthePTFEnanofibersviadippingandsintering.Themorphologyandstructureofthephotocatalystfilmwerecharacterized.EffectsofreactingconditionsoftheTiO2/PTFEsuperfine-fiberfilmonthephotocatalyticdegradationofmethyleneblueunderUV–Vislightirradiationwereinvestigated.Inaddition,therecyclingutilizationofloadtypeTiO2lightcatalystwasalsodiscussed.TheresultshowthattheTiO2(asanatase)/PTFEnanofiberphotocatalystfilmwasobtainedaftercalcinationat450℃.Underthevioletlight(300W,365nm)irradiation,whenirradiationdistanceis30cmandafterirradiationfor55min,theTiO2/PTFEsuperfine-fiberfilmispreparedbydippingfor5h.Itsdegradationrateformethylenebluewithinitialconcentrationof5mg/Landvolumeof100mLis99%.Thedegradationefficiencyofmethyleneblueisstill46%afterrecyclingfor5times,indicatingthattherecyclingutilizationrateisgreater.Keywords:polytetrafluoroethyleneultrafinefiber;titaniumdioxide;electrospinning;photocatalysis随着工业发展，环境问题日益严峻，尤其染料废水污染不断加剧。传统的印染废