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时间:2020-03-26
《氟化改性TiO2空心微球的制备及光催化性能.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29卷第1O期无机化学学报Vol_29No.102013年10月CHINESEJOURNALOFIN0RGANICCHEMISTRY2133.2139氟化改性TiO2空心微球的制备及光催化性能钟永辉'2周琪1刘家琴,2王岩,2陈星3吴玉程2(合肥工业大学材料科学与工程学院,合肥230009)(安徽省先进功能材料与器件重点实验室,合肥230009)(中科院合肥智能机械研究所,合肥230031)摘要:以钛酸四丁酯为钛源、氢氟酸为氟源、乙醇为溶剂,采用溶剂热法合成了氟化改性的TiO:空心微球,并利用X
2、RD、FE—SEM、FⅥR、XPS等手段对氟化TiO:微球的晶体结构、形貌、分子基团以及元素形态等性质进行了表征,同时将TiO微球应用于光催化降解甲基橙溶液。结果表明:氟化TiO空心微球由奥斯瓦尔德熟化过程获得,其中TiO,以锐钛矿存在,氟以化学吸附态存在于TiO2的表面,形成;Ti.F基团。相比纯TiO:,氟化TiO2空心微球光催化活性有很大提高,对初始浓度为20mg.L-1的甲基橙溶液进行光催化降解30min,其降解率达到98%。氟化改性TiO,空心微球光催化活性的提高是源于TiO,独特的空心
3、微球结构以及TiO表面—F基团的存在。TiO表面ri.F基团有很强的吸电子能力,抑制了光生电子与空穴的复合,同时有利于羟基自由基的产生关键词:二氧化钛;氟化;空心微球;光催化中图分类号:0614.411文献标识码:A文章编号:1001—4861(2013)10.2133.07DOI:10.3969/j.issn.1001—4861.2013.00.238PreparationofFluorizatedTi02HollowMicrospheresandTheirPhotocatalyticActiv
4、ityZHONGYong—Hui工ZHOUQiLIUJia-Qin。WANGYan’CHENXing’WUYu-Cheng,,(SchoolofMaterialsScienceandEngieering,HefeiUniversityofTechnology,Hefei230009,China)qAnhuiKeyLaboratoryofAdvancedFunctionalMaterialsandDevices,Hefei230009,China)(31nstituteofIntelligentMa
5、chines,ChineseAcademyofSciences,Hefei230031,China)Abstract:UsingtetrabutylorthotitanateasTisource.hydrofluoricacidasFsourceandethanolassolvent,wellcrystallizedanatase—phaseF—modifiedTiO2hollowmicrosphereshavebeensynthesizedviaasolvothermalprocess.Thes
6、tructureandpropertiesoftheresultingsampleswerecharacterizedbyXRD,SEM,FTIR,XPS.TheresultsindicatedthatthefluorizatedTiO2hollowmicrosphereshadananatasephase,thefluorineatomsweremainlydistributedonthesurfaceofTiO2,andexistedinformsofchemical—adsorption.H
7、ollowanataseTiO2microsphereswereachievedbyOstwaldripeningundersolvothermalconditions.Comparedtopuretitania,thefluorizatedTiO2hollowmicrospheresshowedamuchhigherdegradationefficiency,anddegradationrateofwhichcanbeupto98%duringthephotodegradationofmethy
8、lorangewiththeinitialconcentrationof20mg。L~for30minutes.Themechanismforthegreatimprovementforphotocatalyticactivitycanbeattributedtotheuniquestructureofhollowmicrosphereandthefluorinemodification,becausethestrongelectronwithdrawingabilityofthe
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