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时间:2020-03-27
《溴化银二氧化钛复合材料的可见光催化性能.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24卷第3期化学研究中国科技核心期刊2013年5月CHEMICALRESEARCHhxyj@henu.edu.ca溴化银/-氧化钛复合材料的可见光催化性能曹玉辉,邢阳阳,宗兰兰,李秋叶,杨建军(河南大学特种功能材料教育部重点实验室,河南开封475004)摘要:将硝酸银的乙醇溶液与溶胶凝胶TiO混合得到前驱体,随后经共沉淀一煅烧制备得到AgBr/Ti02复合材料;采用扫描电镜、X射线衍射仪、X射线光电子能谱仪分析了复合材料的形貌、晶体结构、Ag元素的价态,采用紫外一可见漫反射光谱仪测定了其光吸收性能;进而
2、以甲基橙(MO)的可见光降解为探针反应测定了AgBr/TiO复合材料的可见光催化性能.结果表明,当前驱体在不同温度下煅烧后,无定形TiOz颗粒逐渐增大,并逐渐转变为锐钛矿结构;担载的AgBr可明显拓展TiOz的可见光吸收范围;Ag物种主要以Ag形式存在.当煅烧温度为300℃时,复合材料的光催化活性最高,MO的降解率在60min内达到9O以上;随着煅烧温度的增加,催化活性逐渐降低.关键词:溴化银;二氧化钛;复合材料;可见光催化性能中图分类号:0643.32文献标志码:A文章编号:1008—1011(2013
3、)03—0237—05Phototcatalyticactivityofsilverbromide/titaniumdioxidecompositeundervisiblelightirradiationCAOYu—hui,XINGYang—yang,ZONGLan—lan,LIQiu—ye,YANGJian-jun(KeyLaboratoryofMinistryofEducationforSpecialFunctionalMaterials,HenanUniversity,Kaing475004,Hen
4、an,China)Abstract:Theethanolsolutionofsilvernitratewasmixedwithsol—gelTiO2toobtainaprecur—sor.As—obtainedprecursorwasthenCO—precipitatedandcalcinatedtoyieldAgBr/TiO2compos—ite.Themorphology,crystalstructure,andsilvervalenceofas—preparedAgBr/TiO2compos—ite
5、wereanalyzedbymeansofscanningelectronmicroscopy,X—raydiffraction,andX—raypho—toelectronspectroscopy。andits1ight—absorbingperformancewasexaminedbymeansofultra—violet-visiblelightdiffusereflectancespectrometry.Furthermore,thecatalyticactivityofas—preparedAg
6、Br/TiO2compositewasevaluatedbymonitoringthedegradationofmethylorange(MO)undervisiblelightirradiation.ResultsshowthatafterthemixedprecursoriScalcinatedatdifferenttemperatures,thesizeofamorphousTiO2particlesgraduallyincreases,andtheamorphousTiO2isgraduallyt
7、ransformedintoanatase.Besides,incorporatedAgBrisabletosignificantlyexpandthevisiblelightabsorptionrangeofTiO2,andsilverspeciesmainlyexistsintheformofAg.Particularly,AgBr/TiO2compositeobtainedaftercalcinationat300℃possessesthebestphotocatalyticactivityandp
8、rovidesadegradationrateofabove90forMOwithin60min.However,thephotocatalyticactivityofAgBr/TiO2compositedeclinesgradual—lywithrisingtemperatureofcalcination.Keywords:silverbromide;titaniumdioxide;composite;visibleligh
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