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ID:33687539
大小:1.80 MB
页数:64页
时间:2019-02-28
《锐钛矿型tiolt2gt水溶胶和薄膜的制备、表征及其光催化性应用》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、摘要本论文采用TiCl4水解,加氨水调pH,加H202来溶解正钛酸,长时间的低温热处理使其晶型转换,制得了纳米级锐钛矿型Ti02水溶胶,这为TiO:在光催化领域的应用提供了一种新的方式。实验研究了影响Ti02水溶胶稳定性的因素,并对水溶胶进行了TEM和电泳分析,从而简单阐述了Ti02水溶胶保持稳定性的机理。将水溶胶低温干燥,对所得到的Ti02粉末进行了FTIR、XRD和BET比表面积分析,可知:所制备的为纯净的Ti02水溶胶,Ti02颗粒主要以锐钛矿晶型存在,随着热处理温度的升高,晶粒大小变化不大,晶型锐钛矿的峰值增强,
2、结晶更加完善,Ti02颗粒的比表面积在220m29。1左右,随着温度的升高,比表面积变化不大,孔体积和平均孔径却趋向增大。利用所制备的Ti02水溶胶提拉法镀膜,对薄膜在低温下热(或不)处理。对薄膜进行了TEM、Raman、AFM、SEM和UV.Vis分析。可知:所得到的Ti02薄膜也为锐钛矿晶型,且结晶度良好。Ti02晶粒以多个锐钛矿相晶体(晶粒在10nm左右)的形式附着在玻璃片上,且分布相对均匀。所得到的Ti02薄膜透明性良好,其光吸收阈值在354nm左右。在光催化活性方面,测试了Ti02水溶胶降解甲基橙、Ti02粉末
3、降解丙酮、Ti02薄膜降解甲醛和Ti02薄膜降解甲基橙的实验,证实了所制备的试样具有较好的光催化活性。并且所制备的Ti02薄膜在阳光下拥有较好的亲水性。关键词:锐钛矿型;Ti02水溶胶;低温;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
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