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时间:2020-03-27
《煅烧温度对花朵状钨酸铋光催化活性的影响.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、物理化学学报(WuliHuaxueXuebao)508ActaP.一Chim.Sin.2014,30(3),508-512March[Article】doi:l0.3866/PKU.WHXB201312302www.whxb.pku.edu.cn煅烧温度对花朵状钨酸铋光催化活性的影响盛珈怡李晓金许宜铭(浙江大学化学系,硅材料国家重点实验室,杭州310027)摘要:钨酸铋在水相体系中能光催化降解有机污染物,而对于钨酸铋光催化活性影响因素的研究非常少.本文研究了煅烧温度对花朵状钨酸铋光催化活性的影响.以钨酸钠和
2、硝酸铋为原料,在160。C下水热反应20h,合成催化剂,并经不同温度煅烧3h.用X射线衍射(XRD)、拉曼(Raman)光谱、紫外一可见漫反射吸收光谱(UV_VisDRS)$!I荧光(PL)光谱表征样品.结果表明,这些样品具有十分相似的相组成和电子结构.然而,对于水中苯酚的降解,钨酸铋的光催化活性显示出了很大的差异.钨酸铋的光催化活性随着煅烧温度的升高,先上升后下降,最优煅烧温度为350。C,并且不受样品比表面积大小的影响.这些样品的活性差异主要归结于钨酸铋的结晶度、吸光性和表面缺陷对其光生载流子分离效率的
3、综合影响.关键词:钨酸铋:半导体:光催化:苯酚:降解中图分类号:0649EfectofSinteringTemperatureonthePhotOCataIyticActivityFlower-LikeBi2WO6SHENGJia—YiLIXiao-JinXUYi—Ming(StateKeyLaboratoryofSiliconMaterials,DepartmentofChemistry,Zhejiang己Hangzhou31002LPR.China)Abstract:Bl2WO6isreportedly
4、activeforthephotocatalyticdegradationoforganiccompoundsinaeratedaqueoussolution.butfactorsinfluencingthephotocatalyticactivityofpristineBi2WO6havereceivedIittleattention.Inlhisstudy.theeffectofsinteringtemperatureonthephysicalpropertiesofflower-likeBi2WO6w
5、asinvestigated.ThecatalystwassynthesizedthroughlhehydrothermalreactionofNa2WO4andBi(N03)3at160。Cfor20h.foIlowedbysinteringinairatdiferenttemperaturesfor3h.Bi2WO6sampleswerecharacterizedwithX.raydifraction,scanningelectronmicroscopy,andRaman,ultraviolet-vis
6、ibledifusereflectance.andphotoluminescencespectroscopies.AIlsampleshadsimilarphasecompositionsandelectronicstructures.SamplesexhibiteddiferentactivitiesforthephOt0cataIylicdegradationofphenolinaeratedaqueoussolution,underultravioletlight.WithincreasingBi2W
7、06sinteringtemperature,therateofphenoldegradationfirstincreasedandthendecreased.ThemaximumrateofphenoIdegradationwasobservedfromthecatalystsinteredat350。C.SimilarresultswereobtainedwhentherateofphenoIdegradationwasnormalizedwiththespecificSUrfaceareaofthec
8、atalyst.asdeterminedbyN2adsorption.Theobservedsinteringtemperature—dependentphotoactivityofBi2WO6wasattributedtoacombinationofitscrystallinity,lightabsorption,andsurfacedefects.KeyWords:Bismuthtungstate;Semic
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