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ID:33661776
大小:7.68 MB
页数:73页
时间:2019-02-28
《纳米tiolt2gt自清洁涂料的制备及性能研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、硕l:论文纳米Ti02自清洁涂料的制备及性能研究摘要本文以钛酸丁酯为钛源,通过溶胶一凝胶法制备了可与水以任意比例混合,并可直接涂覆使用的透明Ti02溶胶和掺铁的Ti02溶胶。通过降解亚甲基兰研究不同掺铁量对"ri02光催化性能的影响,确定了最佳的Fe掺杂量。并采用X射线光电子能谱(XPS)、差热分析(DTA)、X射线衍射()am)、透射电子显微镜(TEM)对其组织结构进行表征。光催化性能分析结果表明:溶胶样品在太阳光照射下比在紫外光照射下的降解效果好,而粉末样品在紫外光照射下比在太阳光照射下降解效果好;在相同条
2、件下,掺铁的Ti02溶胶和粉末在两种光源照射下均比纯Ti02溶胶和粉末的降解效果好,当铁掺杂达到0.03%时,降解率达到最高。组织结构分析结果表明:纯Ti02粉末在415.7℃从无定型状态转变为锐钛矿型,470℃时Ti02逐渐由锐钛矿型转变为金红石型,铁的掺杂对锐钛矿型具有稳定作用,阻碍Ti02由锐钛矿型向金红石型的转变。Ti02粉末热处理温度分别为200℃、500℃、700l℃时,所获得的晶型分别为非晶态、锐钛矿型、金红石型;500℃热处理后,铁的掺入并没有形成新相,晶粒大小在10rim"-"14nm之间。当
3、掺铁的量达到0.03%时,纳米颗粒的分散性最好。关键词:纳米Ti02,光催化,溶胶,铁掺杂Abstract硕l:论文TransparentTi02hydrosolandFe-Ti02hydrosol,whichcouldbemixedwithwateranduseddirectlyforcoating,werepreparedbysol—gelmethod.withTi(OBu)4asprecursor.TherelationshipbetweentheconcentrationofFeanditsphotoc
4、atalyticactivitywasstudiedbythedegradationrateofmethyleneblue(MB).ThecompositionandmicrostructureofsampleswerestudiedbyX-rayphotoelectronspectroscopy(xPs),differentialthermalanalysis(DTA),X-raydiffraction(XRD),andtransmissionelectronmicroscopy(TEM).Theresult
5、sshowedthat,thephotocatalyticdegradationeffectofhydrosolsamplesunderUVirradiationWasbetterthansolarirradiation,whiletheeffectofpowersamplesWasadverse.Onthesamecondition,thephotocatalyticdegradationeffectofFe-Ti02hydrosolandpowderWasbetterthanthatofTi02hydros
6、olandpowderunderUVandsolarirradiation.WhentheweightratioofFe/Ti02Was0.03%,thephotocatalyticdecompositionratewasthehighest.Theresultsofstructureanalysisrevealedthat,Ti02transformedfromamorphoustOanataseat415.7℃,andanatasetransformedrutilegraduallyat470℃.Thedo
7、pingofFemadeanatasemorestableandcouldpreventthephasechangefromanatasetorutile.ThephaseWasamorphous,anataseandrutilewhentheheattreatmenttemperatureofTi02Was200℃,500"(2,and700*(2.ThedopingofFecouldnotmakeTi02formnewphase.TheparticlesizesofTi02andFe-Ti02wereint
8、herangeof10nm~14nm.WhentheweightratioofFe仍02WaS0.03%thedispersionofnanometerparticleWasbest.Keywords:naD_O-Ti02,photocatalyticproperty,hydrosol,Fe-dopedⅡ声明本学位论文是我在导师的指导下取得的研究成果,尽我所知,在本学位论文中,除了加以
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