Method for preparing nonmetal-doped TiO2 photocatalyst

A photocatalyst, non-metallic technology, applied in the field of preparation of TiO2 photocatalyst, can solve the problems of increasing the amount of combustion agent and auxiliary agent, difficult to control, uncontrollable doping ratio, etc., and achieves the improvement of photocatalytic activity and response performance. Effect

Inactive Publication Date: 2013-03-13
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AI-Extracted Technical Summary

Problems solved by technology

That is, some TiO 2 It is produced by reacting with citric acid and ammonium nitrate, this dependence leads to an increase in the amount of combustion agent and additives
In addition, a large amount of nitrogen generated during the reaction of this method escapes from the powder, and N doping will not be formed. If N doping is formed, ammonium nitrate that does not undergo thermal decomposition must exist, which is difficult ...
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The invention relates to a method for preparing a nonmetal-doped TiO2 photocatalyst, comprising the steps of sol-gel, low-temperature burning and heat treatment so as to prepare the nonmetal-doped TiO2 photocatalyst, wherein butyl titanate serves as a former body; a combustion agent is an organic matter or an inorganic matter containing elements needing to be doped; no metal ion is contained in the combustion agent; and no chemical reaction occurs between the incendiary agent and a Ti chemical compound in the combustion process. In the invention, on the basis of studying the preparation of a superfine photocatalyst, the nonmetal-doped TiO2 photocatalyst is prepared through taking the butyl titanate as the former body and choosing a combustion system different from ammonium nitrate, wherein the nonmetal comprises N, P, S, Si, C and the like; and the prepared catalyst has a certain visible light response performance.

Application Domain

Catalyst activation/preparation

Technology Topic

IonSol-gel +13


  • Method for preparing nonmetal-doped TiO2 photocatalyst
  • Method for preparing nonmetal-doped TiO2 photocatalyst
  • Method for preparing nonmetal-doped TiO2 photocatalyst


  • Experimental program(3)

Example Embodiment

[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.

Example Embodiment

[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.

Example Embodiment

[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.


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Description & Claims & Application Information

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