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(2) Liquid phase method The liquid phase method for preparing nanometer TiO 2 has low synthesis temperature, simple process and small equipment investment, which is an ideal method for preparing nanometer TiO 2 powder
.
In the liquid phase method, there are mainly hydrothermal synthesis method, sol-gel method, microemulsion method, uniform precipitation method and electrophoretic deposition method
.
① Hydrothermal synthesis method
.
The preparation of nanopowders by hydrothermal method uses an aqueous solution as the reaction medium in a closed high-pressure reactor.
The precursors are dissolved in the hydrothermal medium under high temperature and high pressure, and then nucleate, grow, and finally form a particle with a certain particle size and crystal form.
②Sol-gel method
.
The sol-gel method is to control the microstructure of materials through low-temperature chemical means.
It has great application value in the field of material synthesis and is a common method for preparing nanomaterials at this stage
The advantages of this method are low preparation temperature, simple equipment, high product activity, small particle size and uniform distribution, so it is particularly suitable for preparing amorphous
.
The TiO 2 nano powder prepared by this method has a narrow particle size distribution
.
③Microemulsion method
.
The thermodynamically stable, isotropic, transparent or translucent appearance, and a dispersion system with a particle size between 1-100 nm formed by two immiscible liquids under the action of surfactants are called microemulsions
.
④ Precipitation method
.
It can be divided into direct hydrolysis method, homogeneous precipitation method and co-precipitation method
.
⑤ Electrophoresis deposition method
.
When the carrier used has conductivity, such as Pt, C, Ni, stainless steel, conductive glass, etc.
, an electrophoretic deposition method can be used
⑥ Anodizing method
.
In addition to the above basic production methods, the preparation of TiO 2 /Ti catalysts by anodic oxidation has attracted widespread attention from researchers in the field of photocatalysis
.