In recent years, new technologies such as microwave technology, supercritical technology and electrode submerged arc have been introduced into hydrothermal method to synthesize a series of nano-scale ceramic powders, making hydrothermal method one of the most promising nano-TiO 2 synthesis technologies. The basic operation is: adding a precursor of nano TiO 2 (filling degree: 60% to 80%) in a closed autoclave lining a corrosion-resistant material, heating at a certain heating rate, and waiting for the autoclave to reach a desired temperature. The value is kept at a constant temperature for a period of time, and after washing and drying, the nano-sized TiO 2 is obtained . Hydrothermal method provides a special physical and chemical environment for the reaction, dissolution and crystallization of TiO 2 precursor. The nano-TiO 2 powder prepared by hydrothermal method has the characteristics of complete grain development, small original particle size, uniform distribution and less particle agglomeration. In particular, the preparation of nano-TiO 2 by hydrothermal method makes it possible to avoid the high-temperature calcination to be obtained in order to obtain the gold- red TiO 2 , thereby effectively controlling the agglomeration and grain growth between the nano-TiO 2 particles. The key problem of hydrothermal synthesis of nano-TiO 2 is that the equipment has to undergo high temperature and high pressure, so the material and safety requirements are strict, and the cost is high.
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