School of Materials Science and Engineering, The University of New South Wales, Sydney, NSW 2052, Australia.
J Colloid Interface Sci. 2012 Dec 1;387(1):74-83. doi: 10.1016/j.jcis.2012.06.080. Epub 2012 Jul 25.
This study demonstrates a facile and effective method to generate mono-dispersed titanium dioxide spheres at ambient conditions. The size of the colloids can be controlled from 60 to 500 nm by optimizing experimental parameters (e.g., concentration, time, and temperature). Anatase TiO(2) can be obtained through titanium glycolate colloids generated in acetone via two ways: water boiling approach and calcination at a high temperature of 500°C. Particle characteristics (shape, size, and size distribution) were measured by advanced techniques, including transmission electron microscope (TEM), thermo-gravimetric analysis (TGA), UV/Vis absorption spectrum, nitrogen gas adsorption and desorption isotherms Brunauer-Emmett-Teller (BET) surface area measurement, and X-ray diffraction technique (XRD). The possible mechanism of nucleation and growth of such colloids was discussed. The role of acetone in the formation and growth of titanium glycolate colloids was also investigated by Fourier transform infrared (FT-IR) spectroscopy. Finally, the photocatalysis performance of such anatase TiO(2) particles was tested and proved to be efficient in degradation of organic dyes (e.g., phenolphthalein and methly orange).
本研究展示了一种在环境条件下生成单分散二氧化钛球的简便有效方法。通过优化实验参数（例如浓度、时间和温度），可以将胶体的尺寸从 60nm 控制到 500nm。通过两种方式，可以从丙酮中生成的钛醇盐水胶体获得锐钛矿 TiO(2)：水沸腾法和在 500°C 的高温下煅烧。采用先进的技术（包括透射电子显微镜（TEM）、热重分析（TGA）、紫外/可见吸收光谱、氮气吸附和解吸等温线 Brunauer-Emmett-Teller（BET）表面积测量和 X 射线衍射技术（XRD））测量了颗粒特性（形状、尺寸和尺寸分布）。讨论了这种胶体成核和生长的可能机理。还通过傅里叶变换红外（FT-IR）光谱研究了丙酮在钛醇盐水胶体形成和生长中的作用。最后，测试了这种锐钛矿 TiO(2)颗粒的光催化性能，并证明其在降解有机染料（例如酚酞和甲基橙）方面具有高效性。
