Fabrication and Photocatalytic Application of Highly Ordered TiO2 Nanotube Arrays.pdf

August2010，Volume4，No．8(SerialNo．33) JournalofMaterialsScienceandEngineering，ISSN 1934-8959，USA 嚣lL{嚣 |蒜 FabricationandPhot0CatalytiCApplicationofHighly OrderedTiO2NanotubeArrays ZehuanHu，KeDu，YangCao，JianbaoLiandShiweiLin KeyLaboratoryofMin~tryofEducationforApplicationTechnologyofChemicalMaterialsinHainanSuperiorResources，School ofMaterialsandChemicalEngineering,HainanUniversity，Haikou570228，China Received：February24，2010 ／Accepted：M arch20，2010／Published：August25，2010 Abstract：Highly．orderedself-assembledTiO，nanotubearrayshavebeenformedbyelectrochemicalanodizationmethodonapure titanium sheetatroom temperature．Scanningelectron microscopy and X-ray diffractionspectroscopy wereused to study the microstructuresandmorphologiestoidentifytheunderlyingnanotube—arrayformationmechanism．Degradationofmethylorange(MO) bythenanotubea~ayswasperfomr edtoevaluatetheirphotocatalyticproperties．Theeffectsofthethemr al·treatmenttemperatureand pHvalueonthephotocalalyticeffeciencyhavebeendiscussedindetail．ThebestefficiencyofMO degradationcouldbeachievedby theTiO2nanotubesafterthermalannealingat400。C，wheretheremovalofMO was87_3％ in90ra inatpH 1undertheultraviolet lightillumination． Keywords：Nanostructurcs，TiO2，photocatalyticproperties，semiconductors 1．IntrOductiOn suitable ofr being used as working electrodes in photocatalyticprocesses． Inthe 1970s，scientistsdiscoveredthatTi02could Thenewly developedTiO2nanotubearraysshow work asthephotoanodeto splitwaterand generate great advantages on preparing an immobilized hydrogenunderultraviolet(UV)irradiation[1]．Then photoecatalyticelectrode，whichcanbefabricatedon considerable