文献类型：期刊文献

英文题名：Phase transition and morphological evolution of titania/titanate nanomaterials under alkalescent hydrothermal treatment

作者：Zhao, Bin;Chen, Feng[1];Jiao, Yanchao;Zhang, Jinlong

机构：[1]E China Univ Sci & Technol, Key Lab Adv Mat, Shanghai 200237, Peoples R China; E China Univ Sci & Technol, Inst Fine Chem, Shanghai 200237, Peoples R China

年份：2010

卷号：20

期号：37

起止页码：7990

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY

收录：;EI(收录号：20103713231394);WOS:【SCI-EXPANDED(收录号:WOS:000281726600012)】；

基金：This work was supported by the National Nature Science Foundation of China (20777015), National Basic Research Program of China (2010CB732306, 2007CB613301) and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Photodegradation - Scanning electron microscopy - Azo dyes - Irradiation - Salicylic acid - Phase diagrams - Sodium chloride - X ray diffraction - Crystallite size

摘要：A systematic morphological phase diagram of titania/titanate was determined by the most important synthesis parameters of reaction temperature and NaCl concentration via a facile one-step alkalescent approach. X-Ray diffraction and Raman spectroscopy were used to generally assess the phase composition and crystallite size of different titania/titanate samples, which were also used to investigate the phase transition behavior in connection with the synthesis parameters. Scanning/transmission electron microscopy was employed to characterize the morphology, size, and lattice plane, and to further elucidate the morphological evolution of the resulting products. According to the Ostwald's step rule, a phase transition mechanism was proposed based on our current systematic experimental results, which reveals the phase transitions from layered hydrogen titanate to anatase or brookite under hydrothermal treatment. The brookite-anatase composite exhibited excellent photocatalytic activity in the photodegradation of methyl orange, phenol and salicylic acid solution under UV irradiation.