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《銳鈦礦型tiolt2gt水溶膠和薄膜的制備、表征及其光催化性應(yīng)用》由會員上傳分享,免費在線閱讀,更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫。
1、摘要本論文采用TiCl4水解,加氨水調(diào)pH,加H202來溶解正鈦酸,長時間的低溫?zé)崽幚硎蛊渚娃D(zhuǎn)換,制得了納米級銳鈦礦型Ti02水溶膠,這為TiO:在光催化領(lǐng)域的應(yīng)用提供了一種新的方式。實驗研究了影響Ti02水溶膠穩(wěn)定性的因素,并對水溶膠進行了TEM和電泳分析,從而簡單闡述了Ti02水溶膠保持穩(wěn)定性的機理。將水溶膠低溫干燥,對所得到的Ti02粉末進行了FTIR、XRD和BET比表面積分析,可知:所制備的為純凈的Ti02水溶膠,Ti02顆粒主要以銳鈦礦晶型存在,隨著熱處理溫度的升高,晶粒大小變化不大,晶型銳鈦礦的峰值增強,
2、結(jié)晶更加完善,Ti02顆粒的比表面積在220m29。1左右,隨著溫度的升高,比表面積變化不大,孔體積和平均孔徑卻趨向增大。利用所制備的Ti02水溶膠提拉法鍍膜,對薄膜在低溫下熱(或不)處理。對薄膜進行了TEM、Raman、AFM、SEM和UV.Vis分析??芍核玫降腡i02薄膜也為銳鈦礦晶型,且結(jié)晶度良好。Ti02晶粒以多個銳鈦礦相晶體(晶粒在10nm左右)的形式附著在玻璃片上,且分布相對均勻。所得到的Ti02薄膜透明性良好,其光吸收閾值在354nm左右。在光催化活性方面,測試了Ti02水溶膠降解甲基橙、Ti02粉末
3、降解丙酮、Ti02薄膜降解甲醛和Ti02薄膜降解甲基橙的實驗,證實了所制備的試樣具有較好的光催化活性。并且所制備的Ti02薄膜在陽光下?lián)碛休^好的親水性。關(guān)鍵詞:銳鈦礦型;Ti02水溶膠;低溫;Ti02薄膜;光催化AbstractUsingTiCl4tohydrolyze,joiningtheammoniasolutiontOadjustpH,addingH202tOdissolveTi(OH)4,heatingforthelongtimeatlowtemperaturetocausecrystal—typeconvers
4、ion,nano—levelanataseTi02hydrosolisgained.ThisisakindofnewmethodwhichTi02materialcanbeappliedinthephotocatalyticfield.TheexperimentmhderesearchesontheinfluencingfacterswhichkeepthestabilityofTi02hydrosol,andanalyzingthehydrosolbyTEMandelectrophoretictests,alsoexp
5、oundingthestablemechanismsimply.TheTi02powdergainedbythehydrosolisdriedatlowtemperature,andanalysedbyFTIR、XRDandBET.Theresultsshowthatthereisnoimpurityinthepreparingprocess,thetitaniumdioxidehydrosoliscomposedofanatasephase,andthecrystallinitybecomesmoreperfectwi
6、ththeincreaseoftemperature.TheBETsurfaceareasare220m29一,withtemperatureincreasingup,thechangeofBETsurfaceareasisnotobvious,butporevolumeandaverageporediametertendtoexpand.TheTi02thinfilmsarepreparedfromanataseTi02hydrosolbythedipcoatingmethod,andthefilmsareanneal
7、ledatlow-temperaturebutSo/hearenot?ThepreparedthinfiIresarecharacterizedbyTEM?Raman?AFM?SEM?UV—Vis.ItisfoundthatthepreparedTi02thinfilmsarealsoconsistedofanatasephase’S10nmgrains,andthecrystallinityisfine.TheTi02crystalgrainsconglutinateanddistributeuniformlyonsl
8、ideintheformofmulti—crystalanatasephase.Theas—preparedfilmspossessahightransmittanceinvisiblelightband;itsopticalabsorptivethresholdvalueisabout354nm.Intheaspe