大肠杆菌为模板制备Au@TiO_2催化剂及其CO氧化反应活性.pdf

《大肠杆菌为模板制备Au@TiO_2催化剂及其CO氧化反应活性.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)SeptemberActaPhys．一Chim．Sin．，2010，26(9)：2455—24602455【Article】WWW．whxb．pku．edu．cn大肠杆菌为模板制备Au@Ti02催化剂及其CO氧化反应活性刘玉良由翠荣李杨何涛张香芹索掌怀(烟台大学化学生物理工学院’【【J东烟台264005)摘要：许多微生物对金属离子有较强的吸附还原能力．本文利用大肠杆菌(DH5q)对金属离子较强的吸附与还原能力制备了Au@DH5a，再利用大肠杆菌的水分来水解钛酸四丁酯，得到Au@DH5oL—Ti(OH)样品

2、，焙烧去除大肠杆菌后得到氧化钛包裹的纳米金粒子催化剂Au@TiO．以N吸附，x射线衍射(XRD)，紫外一可见漫反射光谱(uV—VisDRS)，热重一差热分析(TG—DTA)，透射电镜(TEM)对所得材料进行表征．结果表明：该催化剂具有与大肠杆菌类似的杆状结构，以大肠杆菌为生物模板生成的氧化钛孔道结构在一定程度上抑制了金粒子的聚集长大．随菌体用量的增加，金粒子减小，等离子共振吸收发生紫移，催化剂有较大的比表面积，但催化剂中积炭量也会增加．将该催化剂用于CO氧化反应，发现当菌体用量为100或150mL时，制得的金催化剂可在8O℃下将CO完全氧化为CO关键词

3、：二氧化钛；大肠杆菌；模板剂；金催化剂；CO氧化中图分类号：0643．3PreparationofAu@TiO2CatalystUsingEscherichiaCoilastheTemplateandItsOxidationReactionActivitytowardCOLIUYu—LiangYOUCui—RongLIYangHETaoZHANGXiang—QinSUOZhang‘Huai(ChemistryandBiologyCollege,YantaiUniversity,Yantai264005,ShandongProvince,PR．China

4、)Abstract：Manyml’croorganismscanadsorbmetalionsstronglyandevenreducethemtotheirmetalstates．WestudiedtheadsorptionofgoldnanoparticlesonEscherichiacoiZ(DH5)toformAu@DH5．TitaniumtetrabutoxidewasaddedtoAu@DH5(xtoprepareAu@DH5oL—Ti(OH)4byhydrolysis．TheDH5dtemplatewasremovedbycalcinat

5、ioninairtoobtaintheAu@TiO，catalyst．ThesematerialswerecharacterizedbyN2adsorption，X—raydiffraction(XRD)，UV—Visdiffusereflectancespectroscopy(uv—VisDRS)，thermogravimetry—differentialthermalanalysis(TG—DTA)，andtransmissionelectronmicroscopy(TEM)．Theresultsshowthatthegoldcatalystmai

6、ntainsarod—likestructuresimilartoDH5uandtheporousstructureofthetitaniumoxidepreparedusingDH5aasabiologicaltemplatecanpreventtheaggregationofgoldnanoparticlestosomeextent．WithhigheramountsofDH5adosage，smallergoldnanoparticleswereobtainedandthesurfaceplasmonabsorptionofgoldnanopar

7、ticlesshiftedtowardshorterwavelengths．Theobtainedgoldcatalysthasalargersurfaceareatharlthecatalystpreparedbytheimpregnationmethod．However，thisincreasesthecokecontentofthecatalyst．CatalyticactivitywasevaluatedbytheCOoxidationreaction．WefoundthatwithaDH5adosageoflO0or150mL，theobta

8、inedgoldcatalystcanconvertCOtoCO2completelyat80