Preparation method for triphase mixed crystal titanium dioxide materials

[0018] Example 1:

[0019] Add 4.4 mL of butyl titanate to 50 mL of 10 mol / L sodium hydroxide solution and continue stirring for 5 hours; wash the resulting precipitate with 150 mL of water 3 times, redisperse it in 40 mL of 0.25 mol / L nitric acid solution, and stir 30 min; Place the resulting mixture in a 100 mL hydrothermal reaction kettle with a tetrafluoroethylene liner, and hydrothermally react at 180°C for 24 h; wash the resulting precipitate with water until the supernatant is neutral, and dry it at 50°C. For details, please refer to figure 1 , figure 1 This is the X-ray diffraction (XRD) pattern of the three-phase mixed crystal titanium dioxide prepared in this example.

[0020] Example 2:

[0021] Add 4.4 mL of isopropyl titanate to 50 mL of 10 mol / L sodium hydroxide solution and continue to stir for 5 h; wash the resulting precipitate with 150 mL of water three times and redisperse it in 40 mL of 0.25 mol / L hydrochloric acid solution. Stir for 30 min; place the resulting mixture in a 100 mL hydrothermal reaction kettle with a tetrafluoroethylene liner, and react hydrothermally at 180°C for 24 h; wash the resulting precipitate with water until the supernatant is neutral, and dry it at 50°C to obtain .

[0022] Example 3:

[0023] Add 4.4 mL of butyl titanate to 100 mL of 8 mol / L potassium hydroxide solution and keep stirring for 5 h; wash the resulting precipitate with 150 mL of water 3 times, redisperse it in 40 mL of 0.25 mol / L hydrochloric acid solution, and stir 30 min; Place the resulting mixture in a 100 mL hydrothermal reaction kettle with a tetrafluoroethylene liner, and hydrothermally react at 180°C for 24 h; wash the resulting precipitate with water until the supernatant is neutral, and dry it at 50°C.