Method for preparing photocatalysts for degrading nitrogen oxide

A technology of photocatalyst and nitrogen oxide, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, organic compound/hydride/coordination complex catalyst, etc., which can solve environmental hazards, low photon quantum efficiency, solar Low light utilization rate and other problems, to achieve the effect of reducing pollution, good application prospects and economic benefits, and reducing costs

Inactive Publication Date: 2018-03-23
XUZHOU NORMAL UNIVERSITY
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  • Abstract
  • Description
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Problems solved by technology

[0003] TiO 2 Due to the advantages of stable chemical properties, high photocatalytic efficiency, non-toxicity and low price, it has become a more commonly used semiconductor photocatalytic material and is widely used in the degradation of pollutants in the environment. However, due to TiO 2 The photocatalyst has a wide band gap and can only be excited by ultraviolet light with a wavelength not greater than 387nln, so the utilization rate of sunlight is very low; moreover, electrons and holes generated by photoexcitation are easy to recombine, resulting in low photon quantum efficiency, and NO is produced It is one of the main pollutants of greenhouse effect, acid rain, ozone hole and photochemical smog, which is very harmful to the environment. In-depth study of nano-TiO 2 For the photocatalytic degradation of NO, the utilization rate of solar energy can be improved by doping, and the nano-TiO 2 The photocatalytic performance is of great significance to the practical application of photocatalytic technology.

Method used

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  • Method for preparing photocatalysts for degrading nitrogen oxide

Examples

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Embodiment 1

[0013] A preparation method for degrading nitrogen oxide photocatalyst, the method comprises the following steps:

[0014] Step 1, 200gTiO 2 @COF nanomaterials are soaked in phosphoric acid aqueous solution with a mass concentration of 40% for 40 hours, filtered to obtain a filter cake, and the filter cake is washed with deionized water until the pH value of the washing solution is 7; the washed filter cake is added to 200ml of deionized water, stir at 50°C to obtain a suspension;

[0015] Step 2, weigh 4.8gBi (NO 3 ) 3 ·5H 2 O dissolved in 5ml of 2mol L -1 HNO 3 After being completely dissolved, slowly add it dropwise to 50ml of the above suspension, stir and mix well, then slowly add 2mol·L -1 10ml of ammonium bromide aqueous solution, stirred for 30min after adding, then added dropwise concentrated ammonia water, adjusted to PH=6, stirred for 4h, stood and aged overnight, filtered with suction, washed with deionized water for 3 times, dried at 80°C, ground Then put i...

Embodiment 2

[0020] Step 2, weigh 2.4gBi (NO 3 ) 3 ·5H 2 O dissolved in 5ml of 2mol L -1 HNO 3 After being completely dissolved, slowly add it dropwise to 50ml of the above suspension, stir and mix well, then slowly add 2mol·L -1 10ml of ammonium bromide aqueous solution, stirred for 30min after adding, then added dropwise concentrated ammonia water, adjusted to PH=6, stirred for 4h, stood and aged overnight, filtered with suction, washed with deionized water for 3 times, dried at 80°C, ground Then put it into a muffle furnace and bake it at 200°C to get BiOBr-TiO 2 @COF composite photocatalyst.

[0021] All the other steps are the same as in Example 1.

Embodiment 3

[0023] Step 2, weigh 1.2gBi (NO 3 ) 3 ·5H 2 O dissolved in 5ml of 2mol L -1 HNO 3 After being completely dissolved, slowly add it dropwise to 50ml of the above suspension, stir and mix well, then slowly add 2mol·L -1 10ml of ammonium bromide aqueous solution, stirred for 30min after adding, then added dropwise concentrated ammonia water, adjusted to PH=6, stirred for 4h, stood and aged overnight, filtered with suction, washed with deionized water for 3 times, dried at 80°C, ground Then put it into a muffle furnace and bake it at 200°C to get BiOBr-TiO 2 @COF composite photocatalyst.

[0024] All the other steps are the same as in Example 1.

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Abstract

The invention discloses a method for preparing photocatalysts for degrading nitrogen oxide. The method has the advantages that the photocatalysts are mainly made of TiO2, benzidine, anhydrous THF (tetrahydrofuran), trihydroxy mesitylene formaldehyde, n-butanol, o-dichlorobenzene, Bi(NO3)3.5H2O and ammonium bromide, nanometer TiO2@COF porous materials are used as matrixes, and the photocatalysts with TiO2@COF coated by BiOBr oxide can be synthesized by the aid of in-situ deposition processes and are simple, stable and efficient novel BiOBr-TiO2@COF photocatalysts with visible light response capability; the method includes novel preparation processes, excellent visible light degradation effects can be realized by the photocatalysts, the cost can be reduced, pollution can be abated, and the method has a good application prospect and a good economic benefit in the aspect of organic pollutant decomposition.

Description

technical field [0001] The invention relates to a photocatalyst for degrading nitrogen oxides and a preparation method thereof, belonging to the technical field of catalysts. Background technique [0002] With the advancement of human science and technology civilization, the industry has been developed on a large scale, and automobiles have become more and more popular, and a large amount of nitrogen oxides have been discharged into the atmosphere. Nitrogen oxides are pollutants of photochemical smog, acid rain, and ozone depletion. Nitrogen oxides have become an urgent problem of air pollution in all countries in the world. The photocatalyst can degrade nitrogen oxides under the action of photocatalysis to generate H 2 O.CO 2 , salt, etc. to achieve harmlessness, thereby purifying the environment. [0003] TiO 2 Due to the advantages of stable chemical properties, high photocatalytic efficiency, non-toxicity and low price, it has become a more commonly used semiconducto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/06B01J27/06B01J37/03B01J37/08B01D53/86B01D53/56
CPCB01D53/8628B01J27/06B01J31/06B01J31/069B01J35/004B01J37/035B01J37/082
Inventor 高光珍张文王斌
Owner XUZHOU NORMAL UNIVERSITY
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