Method for preparing nonmetal-doped TiO2 photocatalyst

[0026] Example 1

[0027] Si doped TiO 2 Preparation of photocatalyst: Prepare 6 parts of the same sol according to the ratio of butyl titanate: water: acetic acid: n-butanol = 1:3:5:8, and then follow the Si/Ti molar ratio as 0, 0.10, 0.15, Add silicon powder at 0.20, 0.25, 0.30, stir well and evaporate to the gel under vacuum. Put the gel in the muffle furnace, continuously inject sufficient oxygen, and increase the temperature at a rate of 1 to 5°C until the gel ignites spontaneously. The autoignition process can maintain the heat required for the system to heat up. After full combustion, non-metal Si doped TiO can be obtained 2. Continue heat treatment at 500℃ for 2 hours to get Si-doped TiO 2 catalyst of light. Si-doped TiO with various Si/Ti molar ratios 2 Photocatalyst, the degradation rate of methylene blue solution under the irradiation of low-pressure mercury lamp is like figure 1 As shown in the figure, the best Si/Ti molar ratio is 0.15, and Si doped TiO 2 The rate constant for the catalyst to degrade methylene blue is 0.026min -1 , Is pure TiO 2 1.20 times of that.

[0028] Example 2

[0029] According to the method of Example 1, adding sulfur powder according to the S/Ti molar ratio of 0, 0.40, 0.60, 0.80, 1.00, 1.20, S-doped TiO can be obtained 2 catalyst of light. S-doped TiO with various S/Ti molar ratios 2 Photocatalyst, the degradation rate of methylene blue solution under the irradiation of low-pressure mercury lamp is like figure 2 As shown, it can be seen from the figure that the best S/Ti molar ratio is 1.00, and S-doped TiO 2 The rate constant for the catalyst to degrade methylene blue is 0.031min -1 , Is pure TiO 2 1.43 times.

[0030] Example 3

[0031] According to the method of Example 1, according to the best doping ratios obtained in Examples 2 and 3 respectively, silicon powder and sulfur powder were simultaneously doped in the sol at a Si/Ti molar ratio of 0.15 and an S/Ti molar ratio of 1.00 , Can make Si/S co-doped TiO2. The rate constant of the catalyst used to degrade methylene blue is 0.035min -1 , Is pure TiO 2 1.61 times.

[0032] According to the description of the above embodiment, by changing the combustion agent, N, P, S, Si, C and other non-metal doped TiO can be prepared 2 catalyst of light.