Local structure changes of microporous titanosilicate ETS-10 upon acid treatment
Local structure changes of microporous titanosilicate ETS-10 upon acid treatment
复制标题
DOI：
10.1021/jp056107w
复制
发表时间：
2007
影响因子：
3.7
通讯作者：
L. Lv;J. Zhou;F. Su;X. Zhao
中科院分区：
文献类型：
--
作者：
L. Lv;J. Zhou;F. Su;X. Zhao
本文采用XRD、FTIR、拉曼、XPS、DR-UV、29 Si MAS NMR和1H− 29 Si CP MAS NMR等技术对微孔钛硅酸盐ETS-10经柠檬酸、磷酸和硝酸处理后的局部结构变化进行了表征。实验结果表明，无论酸的性质如何，质子取代碱金属阳离子改变了ETS-10固体的局部结构，包括硅质基质的部分溶解和TiO 6链中钛物种的浸出。同时，观察到ETS-10的六配位Ti物种变为五配位和/或四配位Ti物种，产生末端TiOH基团，解释了所观察到的酸处理的ETS-10材料对苯酚化合物的光降解活性的增强。
In the present work, the local structure changes of microporous titanosilicate ETS-10 upon treatment with citric acid, phosphoric acid, and nitric acid were characterized using XRD, FTIR, Raman, XPS, DR-UV, 29Si MAS NMR, and 1H−29Si CP MAS NMR techniques. The experimental results suggested that regardless of the nature of the acids, the replacement of alkali cations by protons altered the local structure of ETS-10 solid, including partial dissolution of the siliceous matrix and leaching of titanium species from the TiO6 chains. In the meantime, it was observed that the hexacoordinated Ti species of ETS-10 were changed to penta- and/or tetracoordinated ones, generating terminal TiOH groups, accounting for the observed enhancement of photodegradation activity of the acid-treated ETS-10 materials toward phenol compounds.