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时间:2020-03-26
《TiO2膜光催化剂的制备及可见光催化性能.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第31卷第10期无机化学学报Vo1.3lNo.102015年10月CHINESEJ0URNALOFINORGANICCHEMISTRY2037—2043PW。。Cu/TiO2膜光催化剂的制备及可见光催化性能邹晓梅陈启胜柯小雪雷琴赵梓铭刘希龙陈艳华英杰王崇太f海南师范大学化学与化工学院,海口5711581摘要:以PW.Cu为可见光活性组分.TiO:为载体结构组分,采用溶胶一凝胶法制备了PW,,Cu/TiO复合膜可见光催化剂,并用UV—VisDRS、IR、Raman、XRD、SEM、TEM等手段对催化剂的光吸收性质、化学组成、晶相
2、、表面结构和形貌进行了表征,同时,以模型污染物RhB的可见光降解为探针评估了它的光催化活性,考察了膜处理温度、PW,Cu含量和溶液酸性对催化活性的影响,最后,通过催化剂循环降解RhB试验评估了PWCu/TiO膜的稳定性实验结果表明,PWCu/TiO膜对可见光有明显吸收,低温(100oc)处理的膜为无定形态,高温(5oo℃1处理的膜为多晶态;低温处理的膜具有较高的可见光催化活性,用于RhB的可见光催化降解.在中性条件下反应80min.RhB的降解率为100%,TOC去除达32%f4h);提高溶液酸性有利于催化剂活性的提高,在pH
3、:2.5的条件下,达到100%的RhB降解仅需30min。在本实验条件下,PW..Cu的最佳剂量是3.0g。经过10次循环降解RhB.催化剂的光催化活性仍保留约90%关键词:Keggin型铜取代杂多酸盐;二氧化钛;可见光催化剂;RhB降解;溶胶一凝胶法中图分类号:0643.3文献标识码:A文章编号:1001.4861(2o15)1o一2037—07DoI:l0.11862/CJIC.2015.232PWuCu/Ti02FilmPhotocatalyst:PreparationandVisiblePhOt0catalyticPe
4、rformanceZOUXiao-·MeiCHENQi-ShengKEXiao·-XueLEIQinZHAOZi--MingLIUXi—LongCHENYahHUAYing—JieWANGChong—Tai(SchoolofChemistryandChemico}Engineering,HainanNormalUniversity,H~kou571158,China)Abstract:APWllCu]Ti02compositefilmphotocatalystwaspreparedonthesurfaceofaglasssli
5、deviathesol—geldippingpullingmethodusingtetrabutyltitanateTi(OC4H~4astheprecursorofTiO2andtheKeggintypecoppersubstitutedheteropolyanionPWuCuasthevisiblelightactivecomponentinthispaper.Thenthelightabsorptionproperties,thechemicalcomposition,thecrystalphaseandthesurfa
6、cemorphologyoftheas-preparedcatalystwerecharacterizedusingUV—VisDRS,IR,XRD,SEMandTEM.Meanwhile,thevisiblephotocatalyticactivityofthecatalystwasassessedusingthephotoeatalyticdegradationofRhB,amodelpollutant,asaprobe.Influencesofthecalcinationtemperature,thePWl1Crdosa
7、geandthesolutionpHonthecatalystactivitywerealsoexamined.Intheend,arecycletestofthecatalystforRhBdegradationwasemployedtoevaluatethestabilityofthecatalyst.ExperimentalresultsshowthatthePWuCu/Ti02photocatalysthasagoodabsorptiontovisiblelight.Thefilmyieldedatlowcalcina
8、tiontemperature(100℃)isamorphousandcrystallineathighcalcinationtemperature(500℃).Theformerhashigherphotocatalyticactivity,andwasemployedto
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