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《ZnO纳米棒阵列的改进水热方法制备、银修饰及光催化活性研究.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、2014年12月工业催化Dec.2014第22卷第12期INDUSTRIALCATALYSISVol.22No.12催化剂制备与研究ZnO纳米棒阵列的改进水热方法制备、银修饰及光催化活性研究*褚亚洲,孙亚平,柴梅俊,翁永根,何涛(烟台大学化工制造工程山东省高校重点实验室,山东烟台264005)摘要:ZnO纳米棒阵列是近来研究较多的光催化剂,通过银等贵金属修饰可提高光催化活性。以硝酸锌和六亚甲基四胺为前驱物,通过优化水热合成参数(包括种子层和水热生长液浓度等)以及光化学还原沉积银制备高活性ZnO纳米棒阵列。利用扫描电子显微镜、X射线粉末衍射以及紫外-可见漫反射光谱对样品进行表征。结果表
2、明,种子层和水热反应液浓度均对ZnO纳米棒阵列的活性产生影响。银修饰后,光吸收增强,吸收带边从紫外光区拓展到可见光区。光催化降解甲基橙溶液结果表明,银修饰的ZnO纳米棒阵列较纯ZnO纳米棒阵列降解甲基橙的活性提高30%。关键词:催化化学;ZnO纳米棒阵列;水热合成;光沉积银;光催化doi:10.3969/j.issn.1008-1143.2014.12.007中图分类号:O643.36;TQ426.6文献标识码:A文章编号:1008-1143(2014)12-0928-04PreparationofZnOnanorodarraysthroughmodifiedhydrothermal
3、process,Agdepositionandtheirphotocatalyticactivity*CHUYazhou,SUNYaping,CAIMeijun,WengYonggen,HETao(UniversityKeyLaboratoryofChemicalsManufactureEngineeringofShandong,YantaiUniversity,Yantai264005,Shandong,China)Abstract:ZnOnanorodarraysasthepromisingphotocatalystshavebeenextensivelystudied,andt
4、heirphotocatalyticactivitycanbefurtherimprovedbydepositingAgorothernoblemetalsontheirsurfaces.UsingZnNOandhexamethylenetetramineastherawmaterials,ZnOnanorodarrayswithhighphotocatalytic3activitywerepreparedbyhydrothermalprocessandoptimizationofsyntheticparameters(thethicknessoftheseedlayerandraw
5、materialconcentration)andphoto-depositionofAg.Theas-preparedsampleswerecharacterizedbymeansofscanningelectronmicroscopy,powderX-raydiffractionandUV-visiblediffusingreflectionspectroscopy.Theresultsindicatedthatboththethicknessoftheseedlayerandrawmaterialconcentrationhadthegreatinfluenceontheact
6、ivityofZnOnanorodarrays.LightabsorptionwasenhancedandtheabsorptionedgeswereextendedtothevisiblelightdomainafterAgdeposition.TheresultsofmethylorangesolutionphotocatalyticdegradationshowedthatcomparedwithpureZnOnanorodarrays,theactivityofAgmodifiedZnOnanorodarraysformethylorangedegradationwasimp
7、rovedby30%.Keywords:catalyticchemistry;ZnOnanorodarrays;hydrothermalsynthesis;photodepositionsilver;photocatalysisdoi:10.3969/j.issn.1008-1143.2014.12.007CLCnumber:O643.36;TQ426.6Documentcode:AArticleID:1008-1143(2014)12-0928-04收稿
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