BiVO4复合光催化剂的制备及可见光催化活性.pdf

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1、物理化学学报(WuliHuaxueXuebao)MayActaPhys．一Chim．Sin．，2010，26(5)：1337—13421337【Article】www．whxb．pku．edu．caCu／BiVO4复合光催化剂的制备及可见光催化活性张爱平张进治(北方工业大学理学院，北京100144)摘要：利用水热法制备了Cu掺杂的BiVO复合可见光催化剂，借助x射线衍射(XRD)、X射线光电子能谱(XPS)、紫外一可见漫反射光谱(DRS)~IJ扫描电子显微镜(SEM)对其进行表征．XRD分析显示所有催化剂都呈现单斜结构．XPS结果显示掺杂元素均以其稳定氧化态形式存在于催化剂表面．DRS谱

2、中掺杂样品的吸收边比纯BiVO都有不同程度的红移．以甲基橙(M0)的可见光催化降解反应为探针，研究了催化剂的可见光催化性能．结果表明，经Cu掺杂改性的催化剂的催化能力比纯BiVO有所提高．对其掺杂增强催化能力的可能原因进行了讨论．关键词：光催化；BiVO；复合光催化剂；可见光；水热法中图分类号：0649SynthesesandActivitiesofVisible-Light-DrivenCu[BiVO4CompositePhot0catalystsZHANGAi—PingZHANGJin-Zhi(CollegeofSciences,NorthChinaUniversityofTechn

3、ology，Beijing100144，P．R．China)Abstract：Cu—dopedBiVOphotocatalystswerehydrothermallysynthesizedandcharacterizedbyX—raydiffraction(XRD)，X—rayphotoelectronspectroscopy(XPS)，UV—Visdiffusereflectancespectroscopy(DRS)，andscanningelectronmicroscopyfSEM)．XRDshowedthatallthephotocatalystshavethesamesingle

4、monoclinicsheelitestructure．XPSresultsshowthatCuexistsonthesurfaceoftheBiVO4catalystsastheirstableoxidecationspecies．Anabsorptionedgered—shiftwasobtainedbyDRSstudies．Thephotocatalyticactivitywasinvestigatedusingmethylorange(MO)asaphotocatalyticdegradationmodelreactant．ResultsshowedthattheCu—doped

5、catalystsenhancedphotocatalyticactivitiesundervisible—lightiradiation．Anenhancedphotocatalyticmechanismwasalsodiscussed．KeyWords：Photocatalysis；BiVO4；Compositephotocatalyst；Visible—light；HydrothermalmethodNowadays，environmentalapplicationsofheterogeneouspho—tosolvethisproblem，dopingmetalormetalox

6、idecanalwaystocatalysisforremovingorganicpollutants，especiallyundervis—enhancethephotocatalyticactivitiesbyseparatingthephoto—ible—lightirradiation，havebeenextensivelyagreedtobeanef—generatedelectronsfromholes．fectiveapproach[．Bismuthvanadate(BiVO4)．oneofthenon—Inthepastdecades，avarietyofmetalorm

7、etaloxidesdopedtitania—basedphotocatalysts，hasbeenrecentlyattractingconsid—BiVO4systems，includingCo／BiVO4[6-7]，Pd／BiVO4，Fe／BiVO4，erableattentionsforitsstrongvisible·-light—-responsephoto·-Ag／BiVO一，havebeenstudied．There