TiO_2薄膜的制备、改性及光催化性能的研究.docx

TiO_2薄膜的制备、改性及光催化性能的研究
摘要
TiO_2薄膜作为一种重要的光催化材料，具有良好的光催化性能，可以广泛应用于污染物的降解、污水处理等领域。本文主要介绍了TiO_2薄膜的制备方法，包括溶胶-凝胶法、物理气相沉积法和化学气相沉积法等。另外，针对TiO_2薄膜的改性方法进行了总结，包括以金属离子为掺杂原子、以无机酸为掺杂剂、以有机化合物为掺杂剂等。最后，本文详细介绍了TiO_2薄膜的光催化性能研究，包括光催化机理、影响因素、光催化降解污染物等方面的研究进展。
关键词：TiO_2薄膜；制备方法；改性；光催化性能
Introduction
TiO_2isawidelyusedsemiconductormaterialduetoitsuniqueoptical,electrical,andchemicalproperties.Amongitsvariousforms,TiO_2thinfilmshaveattractedgreatattentionduetotheirexcellentphoto-electrochemicalandphotocatalyticproperties.TiO_2thinfilmpossessesahighsurfacearea,whichprovidesalargenumberofactivesitesforchemicalreactions.ThebandgapofTiO_2isaround3.2eV,whichliesintheUVrange,andcaneasilyutilizetheabundantsolarenergy.Therefore,TiO_2thinfilmshavebeenextensivelyinvestigatedforvariousapplications,suchaswatersplitting,hydrogengeneration,environmentalremediation,solarcells,andsoon.However,thephotocatalyticactivityofTiO_2thinfilmsislimitedbyseveralfactors,mainlyduetoitswidebandgap,fastelectron-holerecombinationrate,andlowsurfacearea.Therefore,improvingthephotocatalyticperformanceofTiO_2thinfilmsbymodifyingtheirstructureisofparamountimportance.
Inthisreview,wesummarizethelatestresearchprogressofTiO_2thinfilms,primarilyfocusingontheirpreparation,modification,andphotocatalyticproperties.First,weintroducethepreparationmethodsofTiO_2thinfilms,includingsol-gelmethod,physicalvapordeposition(PVD)method,andchemicalvapordeposition(CVD)method.Then,wesummarizethemethodstomodifytheTiO_2thinfilms,suchasdopingwithmetalions,dopingwithinorganicacids,dopingwithorganiccompounds,andsoon.Finally,wediscussthephotocatalyticpropertiesofTiO_2thinfilms,includingtheirphotocatalyticmechanism,factorsaffectingtheirphotocatalyticperformance,andtheirapplicationsinwastewatertreatmentandenvironmentalremediation.
PreparationmethodsofTiO_2thinfilms
Sol-gelmethod:Sol-gelmethodisacommonandeconomicaltechniquetoprepareTiO_2thinfilms.Thismethodinvolvesthenucleation,growth,andsolventevaporationoftheprecursorsolutiontoformagellayeronasubstrate.T