Anatase TiO_2 Nanobelts Prepared Hydrothermally from Titanate Nanobelts

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.