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大小:1.59 MB
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时间:2020-03-26
《Ni薄膜的制备及其光催化降解罗丹明B的性能和机理.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3l卷第4期无机化学学报Vol-31No.42015年4月CHINESEJ0URNALOFIN0RGANICCHEMISTRY681—688Ag3PO4/Ni薄膜的制备及其光催化降解罗丹明B的性能和机理李爱昌朱柠柠李京红杨晓艳王爽杨柳(廊坊师范学院化学与材料科学学院,廊坊065000)摘要:用电化学方法制备AgPOn/Ni薄膜,以扫描电子显微镜(SEM)、X射线衍射(XRD)~I紫外一可见漫反射光谱(uv—VisDRS)X~薄膜的表面形貌、晶相结构、光谱特性及能带结构进行了表征,以罗丹明B为模拟污染物对薄膜
2、的光催化活性和稳定性进行了测定.采用向溶液中加人活性物种捕获剂的方法对薄膜光催化降解机理进行了探索结果表明:最佳工艺下制备的Ag3PO4/Ni薄膜具有致密的层状表面结构,是由多晶纳米颗粒构成的薄膜。薄膜具有较高的光催化活性和突出的光催化稳定性,可见光下催化作用60min,薄膜光催化罗丹明B的降解率是多孔P25TiO2/ITO纳米薄膜f自制)的2-3倍;在保持薄膜光催化活性基本不变的前提下可循环使用6次给出了可见光下薄膜光催化降解罗丹明B的反应机理。关键词:Ag3PO4/Ni薄膜;电化学制备;光催化;罗丹明B;
3、反应机理中图分类号:0614.122:0643.32+2文献标示码:A文献编号:1001.4861(2015)04—0681-08DoI:l0.11862/CJIC.2015.094PreparationofAg3PO4fNiThinFilmsandTheirPhotocatalyticActivityandReactionMechanismforRhodamineBLIAi—ChangZHUNing—NingLIJing—HongYANGXiao-YahWANGShuangYANGLiu(Facultyof
4、chem~tryandMaterialSconce,LangfangTeache~College,Lang~ang,Hebei065000China)Abstract:Ag3POdNithinfilmswerepreparedbyelectrochemicalmethod.Thesurfacemorphology,phasestructure,opticalcharacteristicsandbandstructureofthethinfilmwerecharacterizedbyscanningelectr
5、onmicroscopy(SEM),X-raydiffraction(XRD)andultraviolet—visiblediffusereflectancespectroscopy(UV-VisDRS),respectively.ItsphotocatalyticpropertiesandstabilitywereevaluatedwithRhodamineB(RhB)asamodelcompound.Usingamethodofaddingactivespeciesscavengertothesoluti
6、on,mechanismofphotocatalyticdegradationofthefilmwasexplored.TheresultsshowthattheAg3PO4/Nithinfilmpreparedunderoptimumconditionhasacompactlayerstructurecomposedbypolymouphousnanoparticles.Thethinfilmexhibitshighphotocatalyticactivityandexcellentphotocatalyt
7、icstabilitytodecomposeRhodamineB.Thephotodegradationrateisabout2.3timesthatofporousP25TiOdlTOnanofilmunderthevisiblelightin60min.Thefilmmaintainsnearly100%oftheircorrespondinginitialphotocatalyticactivityafter6cycles.Furthermore,theph0todegradationmechanism
8、ofthefilmforRhodamineBunderthevisiblelightwasproposed.Keywords:Ag3POgNithinfilm;electrochemicalpreparation;photocatalysis;rhodamineB;reactionmechanism近年来.半导体光催化降解水中污染物备受人望成为下一代环保新技术。TiO以优异的化学稳们关注I1.3】。
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