化学专业外文文献原稿和译文Word文档下载推荐.docx
- 文档编号:12999586
- 上传时间:2022-10-02
- 格式:DOCX
- 页数:13
- 大小:627.69KB
化学专业外文文献原稿和译文Word文档下载推荐.docx
《化学专业外文文献原稿和译文Word文档下载推荐.docx》由会员分享,可在线阅读,更多相关《化学专业外文文献原稿和译文Word文档下载推荐.docx(13页珍藏版)》请在冰豆网上搜索。
@#@外文文献原稿和译文@#@原稿@#@Facilesynthesisofhierarchicalcore–shellFe3O4@MgAl–LDH@Auasmagneticallyrecyclablecatalystsforcatalyticoxidationofalcohols@#@Anovelcore–shellstructuralFe3O4@MgAl–LDH@AunanocatalystwassimplysynthesizedviasupportingAunanoparticlesontheMgAl–LDHsurfaceofFe3O4@MgAl–LDHnanospheres.Thecatalystexhibitedexcellentactivityfortheoxidationof1-phenylethanol,andcanbeeffectivelyrecoveredbyusinganexternalmagneticfield.@#@Theselectiveoxidationofalcoholstothecorrespondingcarbonylcompoundsisagreatlyimportanttransformationinsynthesischemistry.Recently,ithasbeendisclosedthathydrotalcite(layereddoublehydroxides:
@#@LDH)-supportedCu,AgandAunanoparticlesasenvironmentallybenigncatalystscouldcatalysetheoxidationofalcoholwithgoodefficiency.Inparticular,theAunanoparticlessupportedonhydrotalciteexhibithighactivityfortheoxidationofalcoholsunderatmosphericO 2withoutadditives.Ithasbeenextensivelydemonstratedthattheactivityofthenanometre-sizedcatalystswillbenefitfromdecreasingtheparticlesize.However,asthesizeofthesupportisdecreased,separationusingphysicalmethods,suchasfiltrationorcentrifugation,becomesadifficultandtime-consumingprocedure.Apossiblesolutioncouldbethedevelopmentofcatalystswithmagneticproperties,allowingeasyseparationofthecatalystbysimplyapplyinganexternalmagneticfield.Fromthegreenchemistrypointofview,developmentofhighlyactive,selectiveandrecyclablecatalystshasbecomecritical.Therefore,magneticallyseparablenanocatalystshavereceivedincreasingattentioninrecentyearsbecausetheminimizationintheconsumptionofauxiliarysubstances,energyandtimeusedinachievingseparationscan@#@13@#@resultinsignificanteconomicalandenvironmentalbenefits.@#@Magneticcompositeswithacore–shellstructureallowtheintegrationofmultiplefunctionalitiesintoasinglenanoparticlesystem,andofferuniqueadvantagesforapplications,particularlyinbiomedicineandcatalysis.Howeveritissomewhatofachallengetodirectlyimmobilizehierarchicalunitsontothemagneticcores.Inourpreviouswork,theFe3O4submicro-sphereswerefirstcoatedwithathincarbonlayer,thencoatedwithMgAl–LDHtoobtainananticanceragent-containingFe3O4@DFUR–LDHasdrugtargetingdeliveryvector.Lietal.preparedFe3O4@MgAl–LDHthroughalayer-by-layerassemblyofdelaminatedLDHnanosheetsasamagneticmatrixforloadingW7O24asacatalyst.Thesecore–shellstructuralnanocompositespossessthemagnetizationofmagneticmaterialsandmultiplefunctionalitiesoftheLDHmaterials.Nevertheless,thesereportedsynthesisroutesneedmulti-stepandsophisticatedprocedures.Herein,wedesigna facilesynthesisstrategyforthefabricationofanovelFe3O4@MgAl–LDH@Aunanocatalyst,consistingofAuparticlessupportedonorientedgrownMgAl–LDHcrystalsovertheFe3O4nanospheres,whichcombinestheexcellentcatalyticpropertiesofAunanoparticleswiththesuperparamagnetismofthemagnetitenanoparticles.Tothebestofourknowledge,thisisthefirstinstanceofdirectimmobilizationofverticallyorientedMgAl–LDHplatelet-likenanocrystalsontotheFe3O4coreparticlesbyasimplecoprecipitationmethodandthefabricationofhierarchicalmagneticmetal-supportednanocatalystsviafurthersupportingmetalnanoparticles.@#@AsillustratedinScheme1,thesynthesisstrategyofFe3O4@MgAl–LDH@Auinvolvestwokeyaspects.Nearlymonodispersedmagnetiteparticleswerepre-synthesizedusingasurfactant-freesolvothermalmethod.First,theFe3O4suspensionwasadjustedtoapHofca.10,andthustheobtainedfullynegativelychargedFe3O4sphereswereeasilycoatedwithalayeroforientedgrowncarbonate–MgAl–LDHviaelectrostaticattractionfollowedbyinterfacenucleationandcrystalgrowthunderdropwiseadditionofsaltsandalkalinesolutions.Second,Aunanoparticleswereeffectivelysupportedonthus-formedsupportFe3O4@MgAl–LDHbyadeposition–precipitationmethod(seedetailsinESI).@#@Fig.1depictstheSEM/TEMimagesofthesamplesatvariousstagesofthefabricationoftheFe3O4@MgAl–LDH@Aunanocatalyst.TheFe3O4nanospheres(Fig.1a)showa@#@smoothsurfaceandameandiameterof450nmwithanarrowsizedistribution(Fig.S1,ESI).Afterdirectcoatingwithcarbonate–MgAl–LDH(Fig.1b),ahoneycomblikemorphologywithmanyvoidsinthesizerangeof100–200nmisclearlyobserved,andtheLDHshelliscomposedofinterlacedplateletsofca.20nmthickness.Interestingly,theMgAl–LDHshellpresentsamarkedpreferredorientationwith thec-axisparallelto,andtheab-faceperpendiculartothesurfaceofthemagnetitecores,quitedifferentfromthoseofapreviousreport.AsimilarphenomenonhasonlybeenobservedforthereportedLDHfilmsandthegrowthoflayeredhydroxi
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 化学 专业 外文 文献 原稿 译文