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时间:2020-03-26
《氮-硫共掺杂二氧化钛光催化剂的制备及其可见光催化活性.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24卷第4期化学研究中国科技核心期刊2013年7月CHEMICAIRESEARCHhxyj@henu.edu.cn氮一硫共掺杂二氧化钛光催化剂的制备及其可见光催化活性白ti,娜,左胜利,于迎春,刘建军,李保山(北京化工大学理学院,北京100029)摘要:采用研磨煅烧法,以硫脲(Tu)作为氮源和硫源,HTiO。(HT)为TiO的前驱体,制备了不同TU/HT比例的N,S共掺杂Ti02光催化剂(NS/TiOz);利用X射线衍射仪、透射电镜、X射线光电子能谱仪、拉曼光谱仪、紫外一可见吸收光谱仪等分析了NS/TiO的晶体结构、显微形貌、典型元素的化学状态以及光谱性质;利用BET法测定了NS/TiO2
2、的比表面积,同时测定了其在可见光照下催化降解罗丹明B的活性.结果表明,当TU/HT质量比为0.5时,NS/TiOz的光催化活性最佳,光照7Orain时的罗丹明B降解率为44.4.氮元素以NH。形式吸附在Ti()2表面,硫元素以s形式存在,部分s。取代T的位置.与此同时N,s共掺杂使得TiO。的禁带宽度减小,可见光催化活性提高.关键词:氮硫共掺杂;TiO。;光催化剂;制备;可见光催化活性;测定中图分类号:0643.3文献标志码:A文章编号:1008—1011(2013)04—0355—05Fabricationofnitrogenandsulfurcodopedtitaniumdioxidea
3、nditsvisiblelightphotocatalyticactivityBAIYu—na,ZUOSheng—li,YUYing—chun,LIUJian—jun,LIBao—shan(FacultyofScience,BeijingUniversityoJChemicalTechnology,Beijingl00029,China)Abstract:AseriesofvisiblelightphotocatalystsofTiO2codopedwithNandS(denotedasNS/TiO2)werepreparedbyfacilegrindingcalcinationmethod
4、withthiourea(TU)asthesourceofsulfurandnitrogenandH2TiO3(HT)astheprecursorofTiO2.Thecrystalstructure,micro—morphology,chemicalstateoftypicalelements,andspectrometricpropertiesofas—preparedNS/TiO2photocatalystswereanalyzedbymeansofX—raydiffraction,transmissionelectronmi—croscopy,X—rayphotoelectronspe
5、ctroscopy,Ramanspectrometry,andultraviolet—visiblelightabsorptionspectrometry.Thespecificsurfaceareaofas—preparedNS/TiO2photocatalystswasdeterminedbyBETmethod,andtheircatalyticactivitytowardsthedegradationofRhodamineBundervisiblelightirradiationwasevaluated.ResultsshowthataspreparedNS/TiO2photo—cat
6、alystwithaTUtoHTmassratioof0.5:1exhibitsthehighestphotocatalyticactivityandprovidesaRhodamineBdegradationrateof44.4after70rainofirradiation.Besides。NintheformofNH3isadsorbedonthesurfaceofTiO2,andSexistsintheformofS。andpartiallysubstitutesTi”inTiO21attice.Inthemeantime,NandScodopmgcontributestoreduc
7、etheprohibitedbandgapofTiO2therebyincreasingitsphotocatalyticactivity.Keywords:NandScodoping;titania;photocatalyst;preparation;visiblelightcatalyticactivi—ty;evaluation收稿日期:2013—0l22.基金项目:国家自然科学基金(10972039)
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