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时间:2020-03-26
《TiO2纳米管复合光催化剂的性能及失活再生.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、物理化学学~E(WuliHuaxueXuebao)l318ActaPhys.一Chim.Sin.2014,30(7),1318-1324July[Article]doi:10.3866/PKU.WHXB201404222、^n^,1,.whxb.pku.edu.cnSnO2,TiO2纳米管复合光催化剂的性能及失活再生赵伟荣’施巧梦刘莹(浙江大学环境工程系,杭州310058)摘要:基于微波水热法和微乳液法合成SnOJTiO纳米管复合光催化剂.通过X射线衍射(XRD)、配有能量色散X射线光谱仪(EDX)的透射电镜(TEM)和电化学手段对光
2、催化剂进行表征.以甲苯为模型污染物,考察光催化剂在紫外光(UV)和真空远紫外光(vuv)下的性能及失活再生.结果表明,SnOJTiO纳米管复合光催化剂形成三元异质结(锐钛矿相TiC(A.TiC),金红石相TiC(R-TiO)、A-TiO/SnO和R-TiC/SnO:异质结),促使光生电子.空穴对的有效分离,提高光催化活性.SnO/TiO表现出最佳的光催化性能,UV和VUV条件下的甲苯降解率均达10O%,CO:生成速率()均为P25的3倍左右.但由于UV光照矿化能力不足,中间产物易在催化剂表面累积.随着UV光照时间的增加,SnO/TiC
3、逐渐失活,20h后由138.5mg·m·h下降到76.1mg·mI。·h~.利用VUV再生失活的SnOJTiO,过程中产生的·OH、O、O(’D)、O(P)、O。等活性物质可氧化吸附于催化剂活性位的难降解中间产物,使催化剂得以再生,12h后恢复到143.6mg·m·h~.UV和VUV的协同效应使UV降解耦合VUV再生成为一种可持续的光催化降解污染物模式.关键词:异质结:真空远紫外:甲苯:电子-空穴对:光催化活性中图分类号:0643Performance,DeactivationandRegenerationofSnOdTiO2Nano
4、tubeCompositePhotoCataIyStSZHAOWei-RongSHIQiao—MengLIUYing(DepartmentofEnvironmentalEngineering,ZhejiangUniversity,Hangzhou310058,PR.China)Abstract:Sn02/Ti02nanotubecompositeph0tOcatalystsweresynthesizedbymicrowave—assistedhydrothermaIandmicro.emulsionmethods.Thepholoca
5、taIystswerecharacterizedbyX-raydi仟raction(XRD),transmissionelectronmicroscopywithenergy-dispersiveX-rayspectroscopyfTEM/EDX),andelectrochemicaItechniques.Toluenewaschosenasamodelpollutanttoevaluatetheperformance,deactivation,andregenerationbehaviorofthephotocatalystsund
6、erultraviolet(UV)andvacuumultraviolet(VUV)irradiation.TheresultsshowthatternaryheterojunctionsofSnOiO2nanotubecompositephotocataIystsincludinganataseTiO2(A-TiO2)/rutile-rio2(R—TiO2),A—Ti02/SnO2,andR-TiOdSnO2weresuccessfullycreated.Theywereabletoseparatephotogeneratedele
7、ctron-holepairseficiently,andpromotephotocatalyticactivityaccordingly.SnOJTiO2showedthebestphotocatalyticperformance.UnderUVorVUVirradiation,thetoluenedegradationrateofSnO2/TiO2was100%,andtheCO2formationrate()ofSnO2,1-iO2wasapproximately3timeshigherthanthalofP25.Because
8、ofthelOWmineralizationrateunderUVirradiation.therefractoryiritermediatesgeneratedcanoccupyactivephotocatalytic
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