Hydrothermal method was studied by

Hydrothermal method was studied by geologists in the middle of the 19th century by simulating mineralization in nature. After 1900, scientists established the theory of hydrothermal synthesis, and later began to turn to the research of functional materials. At present, more than 100 kinds of crystals have been prepared by hydrothermal method. Hydrothermal method, also known as hydrothermal method, belongs to the category of liquid chemical method. It refers to the chemical reaction in a sealed pressure vessel under high temperature and high pressure with water as solvent. Hydrothermal reactions can be divided into hydrothermal oxidation, hydrothermal reduction, hydrothermal precipitation, hydrothermal synthesis, hydrothermal hydrolysis, hydrothermal crystallization, etc. according to different reaction types. Hydrothermal crystallization is the most widely used.When synthesizing borate porous materials by hydrothermal method, boroxides are easy to form glassy state and viscous state under high temperature and high pressure, which can not only improve the synthetic form of samples, but also take macromolecular chains as synthetic template chains, so that small molecular groups can be synthesized on the template chains to form basic skeletons. Therefore, the synthesized compounds have various types and rich structures.