清华大学博士论坛会议论文集14VIP免费

ElectrochemicalfabricationofCuAl2O4-CuhybridnanorodsatroomtemperatureDingDa-wei1,CaiWei-min1,2*,LongMing-ce1,WuYa-hui3（1.SchoolofEnvironmentalScienceandEngineering,ShanghaiJiaoTongUniversity,Shanghai200240,China;2.StateKeyLaboratoryofUrbanWaterResourceandEnvironment,HarbinInstituteofTechnology,Harbin150090;3.DepartmentofEnvironmentalScienceandEngineering,SchoolofCivilandEnvironmentalEngineering,HarbinInstituteofTechnology,Harbin150090,China）Abstract:Amongvariousmethodsusedforfabricationofnanoarrays,templatesynthesisusingelectrodepositonhasbeenprovedalowcostandhighyieldtechniqueforproducinglargearraysofnanowiresornanorods.Herein,wepresentanelectrochemicalfabricationofCuAl2O4-Cuhybridnanorodarraysinorderedanodicaluminumoxide(AAO)filmnanotubes.ThenucleationandgrowthofCuAl2O4nanocrystallitewasfavoredbyacomfortableelectro-chemicalenvironment,especially,theappliedpotential,whichwasinvestigatedindetails.ThediameterofthenanorodswasinaccordancewiththesizeofAAOnanotube(40-50nm),withlengthsof600to700nm.PhotocatalysisexperimentoftheassynthesizedCuAl2O4-Cuhybridarraysshowedconsiderabledegradationrateofmethylorangeundervisible-lightirradiation,whichrenderedpotentialapplicationforthedegradationofotherrecalcitrantorganicpollutantsinwaterpurification.Keywords:spinel,CuAl2O4-Cuhybrid,templatesynthesis,photocatalysisIntroductionLowdimensionalspinelcompoundshavedrawnconsiderableattentionfortheirwidevarietyoftechnologicalapplicationsinelectronic,catalytic,andmagneticproperties(AmmundsenandPaulsen2001;Ludersetal.2006;Zhangetal.2005;Jeongetal.2007;Nasr-Allah2002;Dhak2006).Aluminumbasedspinelsconstituteanimportantclassofitskind.Copperaluminate,CuAl2O4,iswellknowntobeaninversespinelandpossessesinterestingelectronicandcatalyticpropertiesandisfoundwideapplicationasceramicpigments,coatingsandcatalysts(Alejandreetal.1999;Shimizu2000;Kim2001;Yahiro2006).Byfar,anumberofapproacheshavebeenreportedforthesynthesisofnanocrystallineCuAl2O4powders:solidstatereaction(L.C.Leu2007),co-precipitationreactioninsolution(Shimizu2000;Kameswari1996)，combustionprocess(Mimani2001)andsol-geltechnique(Yanyan2007;Meyeretal.1999)havebeenused.Nevertheless,alltheeffortstoprepareCuAl2O4spinelmentionedaboverequirehigh-temperature(T>800)calcinationproceduresandthe℃productislimitedtopowersorfilm(Dhak2006;Yahiro2006).Alow-cost,easy-preparednewsynthesismethodisthereforeofgreatattractionconsideringthemorphologycontrolandenergyconserving.Previously,wehavereportedbrieflythesuccessfulsynthesisofnano-scaleCuAl2O4spinelsbyelectrochemicalmethodatroomtemperature.Thisnanorod-likeCuAl2O4-Cuhybridwasfoundgrowwithwellcontrolledmorphologyintheanodicaluminumoxidenanotube(Dingetal.2009).ThenucleationofcrystallineCuAl2O4wasfavoredbyacomfortableelectro-chemicalenvironment,ofwhichelectropotentialwasvitalforthestablegrowthofCuAl2O4crystalswithinconfineddimension.Herein,wediscussedindetailshowpotentialinfluencethedepositionofspinelCuAl2O4intothetubularstructure.Later,excellentsolarspectrummatchingpropertiesandphotocatalyticactivityundervisiblelightirradiationofthemodifiedhybridstructurewaspresented.Thephotocatalyticpropertiesofthenanorodswereinvestigatedbyusingmethylorangeasmodeldye.1Materialsandmethods1.1PreparationofanodicaluminaAluminumfoil(99.99%),0.3-mmthick,isannealedinairat500for4hinfurnace.Al℃pieces,3cm×3cminsize,weredegreasedbyacetonei...