NaBiO_3光催化剂的合成及其光催化性能.pdf

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1、第31卷第3期无机化学学报V01．31No．32015年3月CHINESEJOURNALOFIN0RGANICCHEMISTRY521—528异质型BiOI／NaBiO3光催化剂的合成及其光催化性能姬磊王浩人于瑞敏姜震汪怀远(东北石油大学化学化工学院，石油与天然气化工省高校重点实验室，大庆163318)摘要：根据表面化学蚀刻原理采用加热冷凝回流的方法制备了一系列组成的异质结构BiOI／NaBiO光催化剂。利用x射线粉末衍射(XRD)、扫描电子显微镜fSEM)和紫外一可见漫反射光谱(uv—vis—DRS)等技术对其晶相

2、结构、微观形貌和光吸收性能进行了表征。光催化实验表明，BiOI／NaBiO在可见光下可以有效降解罗丹明B(RhB)，当BiOI与NaBiO的物质的量分数为一定值时，异质结构的光催化剂明显优于单一组分的光催化活性通过加入不同的牺牲剂及荧光实验结果推测了该异质结构材料的光催化机理．并且分析了其光生载流子的传输方向及光催化过程的活性物种研究表明，BiOI／NaBiO的催化活性增强主要归结为两者之间形成了有效的异质结构．其内建电场能够促进光生载流子的分离．同时光生空穴h+在光催化降解过程中是主要的活性物种关键词：光催化；Bi

3、OI；NaBiO3；异质结；机理中图分类号：O614．53~2文献标识码：A文章编号：1001—4861(2015)03—0521—08DoI110．11862／cJIC．2015．080SynthesisofHeterojunctionTypeBiOI／NaBiO3PhotocatalystandEnhancedPhotocatalyticActivitiesJILeiWANGHao—RenYURui．MinJIANGZhenWANGHuai—Yuan(ProvincialKeyLaboratoryofOiland

4、GasChemicalTechnology,CollegeofChemistryandChemicalEngineering,NortheastPetroleumUniversity,Daqing,Heilongfiang163318，China)Abstract：BiOI／NaBiO3heterostructurephotocatalystsweresynthesizedusingHIasetchingagentstoreactwithNaBiObvaheatingcondensaterefluxmethodacc

5、ordingtosurfacechemicaletchingprinciple．SeveralcharacterizationtoolsincludingX．raypowderdiffraction(XRD)，scanningelectronmicroscope(SEM)andUV—Visdiffusereflectancespectra(UV-VisDRS)wereemployedtostudythephasestructures，morphologiesandopticalpropertiesoftheas-pr

6、eparedsamplesrespectively．FromthedegradationofRhodamineB(RhB)undervisiblelightirradiationexperimentalresults．wecanobtainedthattheabsorptioncapacityofas—preparedsampleswereenhancedwithincreasingtheBiOIamountsintheBiOI／NaBiO3heterostructuresuntiltheBiOI／NaBiO3rat

7、ioiS79．62％．WithincreasingBiOIcontent．thephotocatalyticactivityenhancedgraduallyandthendecreased．AstheBiOIc0ntentincreaseto17．34％。thehighestphotocatalyticactivitycouldbeachieved，andtheRhBalmostfadedCOmplete1vwiththetimeincreasingto100min．Theresultsshowthattheads

8、orptionabilityisonlyafactornota1ltoDromotetheph0tocatalyticability．TheErRofNaBiO3andBiO1werecalculatedtobe2．23and2．41eVandtheE(=BofNaBiO3andBiO1were一0．23and0．46eVbytheUV．Vis