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1、碩士論文納米復(fù)合五02的制備及其性能研究摘要本文以鈦酸四丁酯和正硅酸乙酯為原料,采用溶膠凝膠法制備出了納米Ti02-Si02復(fù)合光催化劑。研究了熱處理溫度、時(shí)間、反應(yīng)物配比和醋酸的加入量等因素對(duì)復(fù)合催化劑結(jié)構(gòu)和性質(zhì)的影響,并通過XRD、SEM等手段進(jìn)行表征。結(jié)果表明:合成的復(fù)合催化劑中n02粒徑為12.3rim左右,比表面積為185.32m2/g。利用光催化降解甲基橙的實(shí)驗(yàn)研究了納米Ti02一Si02復(fù)合粒子的光催化活性,光催化甲基橙反應(yīng)3h后的降解率達(dá)到88.3%。在溶膠凝膠法制備納米復(fù)合Ti02粒子基礎(chǔ)上,以石英玻
2、璃為基板制備出納米Ti02.Si02復(fù)合薄膜,并采用程序升溫對(duì)薄膜進(jìn)行了熱處理,研究了升溫速率、熱處理溫度、前驅(qū)物配比等對(duì)復(fù)合薄膜的結(jié)構(gòu)和性能的影響。采用XRD、金相顯微鏡等手段對(duì)復(fù)合薄膜進(jìn)行表征,結(jié)果發(fā)現(xiàn)納米復(fù)合薄膜具有良好的熱穩(wěn)定性。光催化降解甲基橙實(shí)驗(yàn)發(fā)現(xiàn),納米復(fù)合薄膜的光催化活性低于納米Ti02.Si02復(fù)合粒子,但明顯高于純納米Ti02粒子。光催化反應(yīng)3h后,納米復(fù)合薄膜對(duì)甲基橙的降解率可達(dá)至tj82.1%。同時(shí),對(duì)納米復(fù)合薄膜和納米復(fù)合粒子進(jìn)行重復(fù)性實(shí)驗(yàn)發(fā)現(xiàn),與復(fù)合粒子相比,Ti02.Si02復(fù)合薄膜具有更
3、加穩(wěn)定的催化效率。在使用12次后,納米復(fù)合粒子的催化效率由88.3%降低至tJ73.2%,而納米復(fù)合薄膜的催化效率僅由82.1%降低到79.8%。初步認(rèn)為是,將催化劑制成薄膜后,不存在催化劑粒子間的遮蔽問題,可以有效提高光源的利用率,從而提高光催化活性。關(guān)鍵詞:si02;Ti02;納米復(fù)合粒子;納米復(fù)合薄膜;光催化;甲基橙廢水碩士論文納米復(fù)合啊02的制備及其性能研究AbstractTitaniumdioxidecoatedsilicondioxidecompositephotocatalystswereprepared
4、viasol-gelmethodfromtetrabutyltitanateandTEOS.Theinfluenceofcalcinatedtime,calcinatedtemperature,themolarratioofthereactants,thequantityofthecatalyzerontheas-preparedsampleswasinvestigatedviaXRD,DTAandSEM,andtheactingmechanismsofdifferentmethodswerediscnssed.The
5、resultsindicatedthat也ecrystallinesizeofTi02inthecompositeisl2.3rim,andit’Sspecificsurfaceareareached185.32m2/g.Theirphotocatalyticactivitieswerevaluatedbytheprobereactionofmethlyorangedegradation.Thedegradationrateofmethlyorangeis883%aftera3-hourphotocatalytictr
6、eatmentandthatcompositephotocatalystsstillshowhighphotocatalyticactivityof73.2%methyorangedegradationrateafteratwelve3-hourphotocatalytictreatment.11lccompositeTi02-Si02filmswcl'efabricatedonquartzglassviasol-gelmethodaccordingtotheforegoingresult.TheflimsWgl"et
7、reatedbyprogrammingcalcinations.Theinfluenceoftemperaturerisingrate,calcinatedtemperature,themolarratioofthereactantsontheas-preparedsamplesalsowasinvestigatedviaXRD,SEM,DTA,andmicroscope.ItWasfoundthatthecompositefilmshavegoodpropertyofheat-resistant.Thephotoca
8、talyticactifityofcompositefilmsWasalittlelowerthanSi02-Ti02compositepowders,butmuchhigherthanpureTi02Thedegradationrateofmethlyorangeis82.1%aftera3-hourphotocatalytic