A Raman spectroscopic study on the active site of sodium cations in the structure of Na2Ti3O7 during the adsorption of Sr2+ and Ba2+ cations
A Raman spectroscopic study on the active site of sodium cations in the structure of Na2Ti3O7 during the adsorption of Sr2+ and Ba2+ cations
复制标题
DOI：
10.1002/jrs.2634
复制
发表时间：
2010-12
影响因子：
2.5
通讯作者：
Hongwei Liu;Dongjiang Yang;E. Waclawik;Xuebin Ke;Zhanfeng Zheng;Huaiyong Zhu;R. Frost
中科院分区：
文献类型：
--
作者：
Hongwei Liu;Dongjiang Yang;E. Waclawik;Xuebin Ke;Zhanfeng Zheng;Huaiyong Zhu;R. Frost
利用拉曼光谱、X射线衍射仪和透射电子显微镜研究了三钛酸盐纳米纤维吸附二价锶和钡离子后的结构形变。结果表明，Ba2+和Sr2+离子吸附后，分别对应于很长的TiO键(2.2A)和很短的TiO键(1.7A)的309 cm−-1和883 cm-−-1的拉曼光谱强度减弱。此外，随着二价阳离子的吸附，在922cmTiO1处的中长−键的吸收峰减弱，表明Na2Ti3O7中的TiO6八面体更加规则。这些结果表明，Na2Ti3O7中的活性钠(Na+)离子应位于TiO6八面体板条的拐角，即(003)面。X射线衍射图中观察到的(003)面的衍射强度明显降低，进一步证实了这一点。版权所有©2010 John Wiley&Sons，Ltd.
A detailed study on the structural deformation of trititanate nanofibers after the adsorption of divalent strontium (Sr) and barium (Ba) cations was conducted by using Raman spectroscopy, X-ray diffraction (XRD) and transmission electron microscopy (TEM). It was found that the Raman bands at 309 cm−1 corresponding to very long TiO bonds (2.2 A) and at 883 cm−1 corresponding to the very short TiO bonds (1.7 A) decreased in intensity after the adsorption of Ba2+ and Sr2+ cations. Additionally, the band at 922 cm−1 corresponding to an intermediate length TiO bond was observed to weaken with the adsorption of divalent cations, indicating that the TiO6 octahedra in Na2Ti3O7 are more regular. These results suggest that the active sodium (Na+) cations in Na2Ti3O7 should be located at the corner of the TiO6 octahedral slabs, i.e. the plane (003). This was further confirmed by a large decrease of diffraction intensity of the plane (003) observed in the XRD pattern. Copyright © 2010 John Wiley & Sons, Ltd.