光催化
退火(玻璃)
材料科学
形态学(生物学)
化学工程
复合材料
化学
地质学
工程类
有机化学
古生物学
催化作用
作者
Min Zhang,Zhensheng Jin,Jingwei Zhang,Xinyong Guo,Jianjun Yang,Wei Li,Xiaodong Wang,Zhijun Zhang
出处
期刊:Journal of Molecular Catalysis A-chemical
[Elsevier]
日期:2004-05-13
卷期号:217 (1-2): 203-210
被引量:317
标识
DOI:10.1016/j.molcata.2004.03.032
摘要
Nanotubed titanic acid (H2Ti2O4(OH)2) was prepared from nanotubed sodium titanate (Na2Ti2O4(OH)2) by an ion exchange reaction in a pH=1 HCl solution. The effect of annealing temperature on the morphology, structure and photocatalytic behavior of nanotubed H2Ti2O4(OH)2 was studied by means of TEM, XRD, DTG, DSC, BET and ESR. The results showed that nanotubed H2Ti2O4(OH)2 is thermally unstable. Its dehydration consists of two steps. In the first-step dehydration, single-electron-trapped oxygen vacancies (SETOVs) were generated. Accompanying the second-step dehydration, the transition of crystal form from orthorhombic system to anatase took place, at the same time the nanotubes broke. At T>300 °C, when the SETOV concentration greatly increased, the interaction between SETOV happened. (VOo)x formed could play the role of recombination center of photogenerated e−–h+ and make the photocatalytic behavior of TiO2 (anatase, obtained from 500 °C-treated nanotubed H2Ti2O4(OH)2) to become bad.
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