由钛酸盐纳米带水热制备锐钛矿型TiO_2纳米带  

Anatase TiO_2 Nanobelts Prepared Hydrothermally from Titanate Nanobelts

作　　者：刘扬[1] 嵇天浩[1] 周吉[1] 李丽[1] 孙家跃[1] 

机构地区：[1]北京工商大学化学与环境工程学院,北京100048

出　　处：《高等学校化学学报》2010年第7期1297-1302,共6页Chemical Journal of Chinese Universities

基　　金：国家"九七三"计划项目(批准号:2006CB932605);北京工商大学高层引进人才项目(批准号:19000531813)资助

摘　　要：研究了水热处理具有层状结构的钛酸钠纳米带或钛酸纳米带转化为锐钛矿型TiO2的制备过程、难易程度和相转化机理.实验结果表明,当水热反应温度和时间分别在160℃和24h以内,钛酸钠纳米带很难完全转化为锐钛矿型TiO2,若升高反应温度并延长反应时间,则可制得纯的锐钛矿型TiO2,但纳米带形貌被严重破坏;当水热反应温度和时间分别为160℃和16h时,1次酸洗的钛酸纳米带能够完全转化为锐钛矿型TiO2,若钛酸纳米带经过3次强酸浸泡,则在160℃下相转化时间就会缩短到12h,所有钛酸纳米带在转化为TiO2后的形貌仍为纳米带,但经3次酸浸后生成的TiO2纳米带表面更光滑.讨论了钛酸钠纳米带或钛酸纳米带转化为锐钛矿型TiO2的相转化机理.Preparation process and phase-transformation mechanism of anatase TiO2 from sodium titanate or hydrogen titanate nanobelts were studied with various measurement techniques. The results show that it is difficult for sodium titanate nanobelts to transform into anatase TiO2 below the reaction temperature of 160 ℃ and the reaction time of 24 h,whereas pure anatase TiO2 without the morphology of nanobelts can be obtained under the higher reaction temperature and the longer reaction time. The pure anatase TiO2 nanobelts can also be prepared from hydrogen titanate by immersed into strong acid for one time at 160 ℃ for 16 h,after immersing into acid for three times,the pure anatase TiO2 nanobelts can be prepared at 160 ℃ for 12 h. The transformation mechanism from sodium titanate or hydrogen titanate nanobelts to anatase TiO2 was also discussed.

关 键 词：水热合成 相转化 钛酸盐纳米带 TIO2纳米带 

分 类 号：O614[理学—无机化学] O543[理学—化学]