School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore.
Nanoscale. 2010 Dec;2(12):2751-7. doi: 10.1039/c0nr00440e. Epub 2010 Oct 11.
Titania (TiO2) and sodium titanate nanostructures with controllable phases and morphologies were synthesized by a hydrothermal method with titanium disulfide (TiS2) as the starting material. Sodium titanate nanobelts could be synthesized under a relatively low alkaline concentration (1 mol L(-1) NaOH) and short duration (6 h). At 3 mol L(-1) HCl, rutile TiO2 nanorods were synthesized. Anatase TiO2 nanoparticles were obtained at pH values ranging between 2 and 13. FTIR analysis confirmed the phase change as the pH of the reacting medium increased from highly acidic to highly alkaline. The adsorption of Methylene Blue (MB) on the as-synthesized sodium titanate nanobelts fitted well with the Langmuir monolayer model, with an adsorption capacity as high as 312.5 mg g(-1). The kinetics of MB adsorption was found to be a pseudo-second-order kinetic model. In brief, this study demonstrates a simple method to control the phase and morphology of titanium-based oxides. Excellent performance has been shown in the MB adsorption test by the sodium titanate nanostructures.
采用水热法，以二硫化钛（TiS2）为起始原料，合成了具有可控相和形貌的二氧化钛（TiO2）和钛酸钠纳米结构。在相对较低的碱性浓度（1 mol L(-1) NaOH）和较短的时间（6 h）下，可以合成钛酸钠纳米带。在 3 mol L(-1) HCl 中，合成了锐钛矿 TiO2 纳米棒。在 pH 值在 2 到 13 之间时，得到了锐钛矿 TiO2 纳米颗粒。FTIR 分析证实，随着反应介质 pH 值从强酸性增加到强碱性，相发生了变化。亚甲基蓝（MB）在合成的钛酸钠纳米带的吸附很好地符合朗缪尔单层模型，吸附容量高达 312.5 mg g(-1)。MB 吸附的动力学符合准二级动力学模型。总之，该研究展示了一种控制基于钛的氧化物的相和形态的简单方法。通过钛酸钠纳米结构在亚甲基蓝吸附测试中表现出了优异的性能。
