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为了改善纳米TiO2的分散性,利用表面包覆技术,在TiO2的表面形成致密的SiO2膜,以达到改性的目的。讨论了SiO2包覆纳米TiO2的作用、机理和包覆工艺条件,并对包覆后的TiO2通过透射电子显微镜、Z-3000Zeta电位与粒度分布仪以及红外光谱分别进行分析。实验结果表明,包膜后的TiO2表面状态发生了变化,TiO2在水溶液中的分散性能得到明显改善。由红外光谱得知,这种包覆不仅是物理包覆,也是一种化学键合,在TiO2的表面形成Ti—O—Si键。
In order to improve the dispersion of nano-TiO2, surface coating technology is used to form a dense SiO2 film on the surface of TiO2 to achieve the purpose of modification. The effects and mechanism of SiO2 coating on nano-TiO2 were discussed. The coated TiO2 was analyzed by transmission electron microscopy, Z-3000Zeta potential and particle size distribution analyzer and infrared spectroscopy. The experimental results show that the surface state of the coated TiO2 is changed, and the dispersion of TiO2 in aqueous solution is obviously improved. From infrared spectroscopy, it is known that this coating is not only a physical coating, but also a chemical bond, forming Ti-O-Si bonds on the surface of TiO2.