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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
HAINAN NORMAL UNIVERSITY
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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 to control.
And in this method, do not propose how to control the specific measures of the thermal decomposition degree of ammonium nitrate
Therefore, this method can only obtain titanium dioxide photocatalysts doped with metal ions, nitrogen doped, or co-doped with metal ions and nitrogen, and the doping ratio of each component cannot be controlled. Non-metal nitrogen doped TiO 2 Photocatalyst formation is difficult to control

Method used

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

Examples

Experimental program
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Effect test

Embodiment 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 according to the Si / Ti molar ratio of 0, 0.10, 0.15, Add silicon powder at 0.20, 0.25, and 0.30, stir well, and evaporate to gel in vacuum. Put the gel into the muffle furnace, continuously feed sufficient oxygen, and raise the temperature at a rate of 1-5°C until the gel spontaneously ignites, and the spontaneous combustion process can maintain the heat required for the system to heat up. After full combustion, non-metallic Si-doped TiO can be obtained 2 . Continue heat treatment at 500°C for 2 hours to obtain Si-doped TiO 2 catalyst of light. Si-doped TiO with various Si / Ti molar ratios 2 Photocatalyst, under the irradiation of low-pressure mercury lamp, the rate of degradation of methylene blue solution changes as figure 1 As shown, it can be seen from the figure that the optimum Si / Ti molar rat...

Embodiment 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, under the irradiation of low-pressure mercury lamp, the rate of degradation of methylene blue solution changes as figure 2 As shown, it can be seen from the figure that the optimal S / Ti molar ratio is 1.00, and the S-doped TiO 2 The rate constant of catalyst degradation methylene blue is 0.031min -1 , is pure TiO 2 1.43 times.

Embodiment 3

[0031] According to the method of Example 1, according to the optimal doping ratio obtained respectively in Examples 2 and 3, silicon powder and sulfur powder are simultaneously doped in the sol according to the Si / Ti molar ratio of 0.15 and the S / Ti molar ratio of 1.00 , can make Si / S co-doped TiO2. The rate constant of the catalyst for the degradation of methylene blue is 0.035min -1 , is pure TiO 2 1.61 times.

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

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Abstract

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.

Description

technical field [0001] The present invention relates to TiO 2 Photocatalyst preparation, and sol-gel self-propagating synthesis for a metal-free doped TiO 2 Preparation method of photocatalyst. Background technique [0002] Sol-gel self-propagating combustion synthesis, also known as low-temperature combustion synthesis, is a synthesis process developed in the 1990s. This technique of relying on the heat release of the reaction itself to continue the chemical reaction and synthesize the required materials has the following advantages: after ignition, the high temperature required for the chemical reaction can be achieved by using the heat release of the raw material itself; the generation of gas makes the formed powder difficult Agglomeration and growth can synthesize powders with uniform and high specific surface area. Because the redox reaction occurs in a very short time in this method, the reaction is relatively violent, and ultrafine particles that can only be synthe...

Claims

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Application Information

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IPC IPC(8): B01J37/08B01J27/00B01J27/18B01J27/02B01J21/06B01J21/18B01J27/182B01J35/10A62D3/10
Inventor 史载锋刘艳玲刘炜何文英郭术张苏敏
Owner HAINAN NORMAL UNIVERSITY
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