Ag掺杂型空心TiO2纳米微球的制备与表征及其光催化性能.pdf

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1、物理化学学~(WuliHuaxueXuebao)SeptemberActa．-Chim．Sin．2012，28(9)，2155—21612l55[Article】doi：10．3866／PKU．WHXB201206262www．whxb．pku．edu．cnAg掺杂型空，DTiO2纳米微球的制备与表征及其光催化性能姬平利王金刚朱晓丽孔祥正’(济南大学化学化工学院，济南250022)摘要：通过甲基丙烯酸与苯乙烯的乳液聚合制备了表面载有阴离子的聚苯乙烯(PSt)纳米乳胶粒．在乙醇与水的混合溶剂中，用硅烷偶联剂乙烯基三甲氧基硅烷对其进行表面改性．以此乳胶粒为模板，加入钛酸四丁酯和硝酸银制备了Ag：

2、O掺杂型聚苯乙烯／二氧化钛(PSt／TiO：)复合微球．对该微球在180。C进行液相预处理、干燥、500。C煅烧等步骤制备了Ag掺杂型Ag．TiO复合粒子．通过扫描电镜(SEM)、透射电镜(TEM)和X射线衍射(XRD)等手段对PSt／TiO复合粒子及Ag．TiO空心粒子的形貌及晶体结构等进行了表征．考察了Ag．TiO复合粒子在紫外光(365nm)与紫外-可见光(370—760nm)下对罗丹明B(RhB)降解的催化活性．结果表明，与不含银的TiO：空心微球相比，在紫外光照射下，银含量(门，n)为0．1％的Ag—TiO：复合粒子对RhB的降解率提高了11％左右：在紫外．可见光照射下，门Ag／门

3、为1．0％和2．0％的Ag-TiOz复合粒子对RhB的降解率提高了30％左右．关键词：聚苯乙烯乳胶粒模板：表面改性：Ag-TiOz空心微球：光催化性能：罗丹明B光降解中图分类号：0643．3PreparationofSilverDopedTi02HollowNanoparticlesandCharacterizationofTheirStructuresandPhotoCatalytiCPropertiesJIPing—LiWANGJin—GangZHUXiao—LiKONGXiang-Zheng(SchoolofChemistryandChemicalEngineering,Univers

4、ityofJinan，Jinan25002ZPR．China)Abstract：Anionicpolystyrene(PSt)latexparticlesweresynthesizedbyemulsionpolymerizationofmethacrylicacidandstyrene(St)．TheanionicPStparticlesweresurfacetreatedwithvinyltrimethoxysilaneinamixtureofethanolandwater．PSt／Ti02compositeparticlesdopedwithAg2Owerethenpreparedthr

5、oughhydrolysisoftetrabutyltitanateandAgNO3usingthesurfacetreatedPStparticlesastemplates．HollowAg—TiO2particlesweresuccessfullypreparedbytreatingthePSt／TiO2compositemicrospheresat180。C，afterwhichtheyweredriedandcalcinedat500。C．ThemorphologyofthePSt，1_iO2particlesandcrystalstructureoftheAg—TiO2hollow

6、particleswerecharacterizedwithscanningelectronmicroscopy(SEM)，transmissionelectronmicroscopy(TEM)，andX-raydifraction(XRD)．PhotocatalyticactivityoftheAg—Tio2hollowparticlesforRhodamineB(RhB)degradationwastestedunderultraviolet(UV，365nm)andUV-visible(370-760am)light．UnderUVlight，RhBdegradationwasincr

7、easedbyabout11％whenAg-TiO2particleswithmolarrationAfln11of0．1％wereusedcomparedwithpureTiO2hollowparticles．UnderUV-visiblelight，RhBdegradationwasincreasedbyabout30％forAg-TiO2compositeparticleswithnagnOf1．0％a