Characteristics of Titanate Nanotube and the States of the Confined Sodium Ions
Characteristics of Titanate Nanotube and the States of the Confined Sodium Ions
复制标题
DOI：
10.1021/jp8069223
复制
发表时间：
2008-10
影响因子：
3.7
通讯作者：
Junya Suetake;A. Nosaka;K. Hodouchi;H. Matsubara;Y. Nosaka
中科院分区：
文献类型：
--
作者：
Junya Suetake;A. Nosaka;K. Hodouchi;H. Matsubara;Y. Nosaka
采用不同浓度的酸(HNO3)溶液和不同温度的热处理方法对二氧化钛(TiO2)和氢氧化钠反应制备的钛酸盐纳米管(TNTs)进行了处理。考察了处理后的TNTs的性质与光催化活性的关系。用~(23)Na和~1H核磁共振谱分析了Na离子在TNTs中的状态和作用。结果表明，Na离子与TNT体系存在强相互作用和弱相互作用两种状态。强结合在TNT中间层的Na离子对稳定管状结构起着重要作用。另一方面，Na离子与TNT表面的弱相互作用抑制了TNT的光催化活性，但可以用50 mM的HNO3溶液进行弱酸处理，从而获得最佳的光催化活性。此外，TNT表面的Na离子干扰了焙烧过程中向锐钛矿的晶化转变。虽然光催化Ac。
The titanate nanotubes (TNTs) prepared by the reaction of titanium dioxide (TiO2) with NaOH were treated with acid (HNO3) solutions of various concentrations and/or heat treated at different temperatures. The properties of the treated TNTs were investigated in relation to the photocatalytic activities. The state and the role of Na ions confined in the TNTs were analyzed by means of 23Na and 1H NMR spectroscopy. It was revealed that there exist two states of Na ions, i.e. strongly and weakly interacting with the TNT system. The Na ions strongly bound to the interlayer of TNT play an important role to stabilize the tube structure. On the other hand, Na ions weakly interacting with the surface of the TNT suppress the photocatalytic activity but can be easily removed by a weak acid treatment with 50 mM HNO3 solution to lead the optimum photocatalytic activity. In addition, the Na ions on the surface of the TNT interfere with the crystalline transition to anatase on calcinations. Although the photocatalytic ac...