c-n共掺杂纳米tio2的制备及其光催化制氢活性

《c-n共掺杂纳米tio2的制备及其光催化制氢活性》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、物理化学学报(WuliHuaxueXuebao)SeptemberActaPhys.鄄Chim.Sin.,2009,25(9)：1829-18341829[Article]www.whxb.pku.edu.cnC鄄N共掺杂纳米TiO2的制备及其光催化制氢活性鄢张晓艳崔晓莉(复旦大学材料科学系,上海200433)摘要：采用TiCN粉末在空气气氛中不同温度下焙烧制得C鄄N共掺杂的纳米TiO2光催化剂.利用X射线衍射(XRD)、透射电镜(TEM)、紫外鄄可见漫反射光谱(UV鄄VisDRS)以及X射线光电子能谱(XPS)等手段对其进行了表征.XRD和XPS结果表

2、明,TiCN中的C和N元素可以被O取代得到C鄄N共掺杂的TiO2.DRS结果表明,所制得的C鄄N共掺杂的TiO2在可见光区域比P25表现出更强的光吸收性能.以Na2S鄄Na2SO3体系为牺牲剂,分别考察了不同温度下焙烧得到的C鄄N共掺杂的TiO2光催化分解水产氢的活性.结果表明,550益焙烧得到的C鄄N共掺杂的TiO2在紫外光照射下具有最高的光解水产氢活性,产氢速率为41.1滋mol·h-1,大于P25的光解水产氢活性(26.2滋mol·h-1).在紫外鄄可见光照射下,光解水产氢速率仅为0.2滋mol·h-1,这可能是由于C鄄N掺杂引起的可见光范围的吸收

3、对光催化分解水产氢活性的贡献较小.关键词：光催化;C鄄N共掺杂二氧化钛;TiCN;产氢中图分类号：O643PreparationandPhotocatalyticHydrogenEvolutionPerformanceofC鄄NCo鄄dopedNanoTiO2Photocatalysts鄢ZHANGXiao鄄YanCUIXiao鄄Li(DepartmentofMaterialsScience,FudanUniversity,Shanghai200433,P.R.China)Abstract：Carbon鄄nitrogenco鄄dopedtitaniumd

4、ioxide(TiO2)nanoparticlesweresynthesizedbycalciningtitaniumcarbonitride(TiCN)powderinairatdifferenttemperatures.Theas鄄preparedpowderswerecharacterizedbyX鄄raydiffraction(XRD),transmissionelectronmicroscopy(TEM),ultraviolet鄄visiblediffusereflectancespectroscopy(UV鄄VisDRS),andX鄄rayp

5、hotoelectronspectroscopy(XPS).XRDandXPSresultsshowedthatnitrogenandcarbonintheTiCNlatticecouldbereplacedbyoxygenthroughcalciningtheTiCNpowderinair.StrongerlightabsorptioninboththeUVandvisiblelightregionwasobservedfortheas鄄preparedpowderscomparedtocommercialP25fromtheDRSresults.Th

6、ephotocatalytichydrogenevolutionperformanceoverboththeas鄄preparedcatalystsandP25wastestedusingNa2S鄄Na2SO3asasacrificialelectrondonorunderUVandUV鄄Vislightirradiation.ThehighestphotocatalyticactivitywasobservedforCN鄄TiOobtainedfromTiCNandcalcinedat550益.Thehydrogenevolutionratereach

7、ed41.1滋mol·h-1,2whichishigherthanthatfromP25(26.2滋mol·h-1).ThismaybecausedbyasynergisticeffectbetweendopedCandNelements.UnderUV鄄Vislightillumination,thehighesthydrogenevolutionratewas0.2滋mol·h-1,whichmaybeduetoaminorcontributionofvisiblelightabsorptiontowaterphoto鄄splittingforhyd

8、rogenproduction.KeyWords：Photocatalysis;