环境修复新型纳米TiO2材料的合成因素探讨

当前在环境污染处理方面,纳米TiO2显示出非常优异的光催化降解性能,但在众多种合成纳米TiO2的方法中很难对合成因素加以调节以使合成产品性能得到改善,用较为温和温度下的晶化来替代高温晶化,可以较大程度地克服一些合成方法的弊端,水热合成法利用反应料液自生的一些压力可以促进温和温度下纳米晶体的合成。因此,文章以水热合成纳米TiO2为讨论重点,综述了纳米TiO2合成过程中实验原料(如钛源、反应添加剂)、实验环境(如反应体系状态、温度、压力、pH)、实验过程控制条件(如升温速率、反应时间)等因素对所得纳米粒子物化性质的影响。经讨论发现各因素间有着紧密的相关性,需要一个完整的参数体系来联系各因素,从而指导纳米TiO2制备技术的改进,对纳米TiO2制备过程进行讨论的同时指出存在的一些问题及其今后的发展趋势。

Review on the preparation of novel TiO2 nanometers for environmental remediation

The review has made on the base of the factors existing in the hydrothermal preparation process of TiO2 nanometers. The experimental factors include titanium resource, reaction additives, the state of reaction system, temperature, pressure, pH, the rate of heating and reaction duration. It can be deduced from the literatures that there is a close interrelation among the experimental factors. It is necessary to establish a universal system so that the interrelationship among the experimental factors can be understood, and then the modification of the preparation of TiO2 nanometers can be directed by the system. The current issues in the process of the preparation of nanometer TiO2 and the development of the process in the future were discussed, which might provide a new sight for the novel environment-friendly TiO2 nanometers under the low temperature.