阅读说明：本技术 一种具有超强降解效果的BiOCl光催化剂的制备方法 (Preparation method of BiOCl photocatalyst with super-strong degradation effect ) 是由 张明义 于 2019-10-14 设计创作，主要内容包括：本发明公开了一种具有超强降解效果的BiOCl光催化剂的制备方法,通过将BiOCl制备成特殊的微纳米级的椭圆体结构,显著改善了光催化剂的可见光催化效率,对气相甲醛、刚果红溶液和六价铬溶液的降解率均可达到90％以上；而且由于该BiOCl光催化剂结构稳定,故有很好的重复使用性能,使得该光催化剂成本更低,能够更加广泛的应用于环境污染处理领域。(The invention discloses a preparation method of a BiOCl photocatalyst with super strong degradation effect, which is characterized in that BiOCl is prepared into a special micro-nano ellipsoid structure, so that the visible light catalysis efficiency of the photocatalyst is obviously improved, and the degradation rate of gas-phase formaldehyde, Congo red solution and hexavalent chromium solution can reach more than 90%; and because the BiOCl photocatalyst has a stable structure, the BiOCl photocatalyst has good reusability, so that the cost of the photocatalyst is lower, and the BiOCl photocatalyst can be more widely applied to the field of environmental pollution treatment.)

1. A preparation method of a BiOCl photocatalyst with super-strong degradation effect is characterized by comprising the following steps:

A. dissolving a proper amount of bismuth nitrate in a mixed solution of deionized water and ethanol, and stirring to obtain a clear solution, wherein the concentration of the bismuth nitrate is 0.1-0.3 mol/L;

B. weighing ammonium chloride, glycerol and oleic acid, adding into the solution, and stirring uniformly;

C. transferring the mixed solution obtained in the step B into a stainless steel reaction kettle with a polytetrafluoroethylene lining, heating for 8-12h at the temperature of 120-150 ℃, and naturally cooling;

D. filtering, repeatedly washing the solid with ethanol for 3-5 times, and spray drying.

2. The method for preparing a BiOCl photocatalyst with a super-strong degradation effect as claimed in claim 1, wherein in the step A, the volume ratio of the deionized water to the ethanol is 1: (6-10).

3. The method for preparing a BiOCl photocatalyst with ultra-strong degradation effect as claimed in claim 1, wherein in the step B, the amount of the ammonium chloride is 2-4 times of that of the bismuth nitrate.

4. The method for preparing a BiOCl photocatalyst with superstrong degradation effect according to claim 1, wherein in the step B, the volume ratio of oleic acid to ethanol is (1-3): 10; the volume ratio of the glycerol to the ethanol is (0.2-0.5): 10.

5. the method for preparing BiOCl photocatalyst with super degradation effect as claimed in claim 1, comprising the steps of:

A. dissolving a proper amount of bismuth nitrate in a mixed solution of deionized water and ethanol, and stirring to obtain a clear solution, wherein the concentration of the bismuth nitrate is 0.15 mol/L;

B. weighing ammonium chloride, glycerol and oleic acid, adding into the solution, and stirring uniformly;

C. transferring the mixed solution obtained in the step B into a stainless steel reaction kettle with a polytetrafluoroethylene lining, heating for 10 hours at the temperature of 128 ℃, and naturally cooling;

D. filtering, repeatedly washing the solid with ethanol for 4 times, and spray drying;

in the step A, the volume ratio of the deionized water to the ethanol is 1: 8.5;

in the step B, the amount of the ammonium chloride substance is 2.5 times of that of the bismuth nitrate substance;

in the step B, the volume ratio of the oleic acid to the ethanol is 1.5: 10; the volume ratio of glycerol to ethanol is 0.3: 10.

6. a method for preparing BiOCl photocatalyst having superior degradation effect as defined in claims 1-5, BiOCl photocatalyst prepared by the method.

Technical Field

The invention relates to the technical field of photocatalysts, in particular to a preparation method of a BiOCl photocatalyst with a super-strong degradation effect.

Background

Semiconductor-based photocatalytic technology has become one of the methods for effectively degrading water pollution, compared with other methods (filtration, adsorption, biotechnology, etc.) thatThe following advantages are provided: clean and harmless, low price, and can use sunlight, etc. For example, TiO₂Semiconductor materials such as ZnO, etc. have been used for photodegradation of pollutants in sewage. However, since these materials have a large forbidden band width (> 3.0eV) and use only ultraviolet light in sunlight, there is a tendency that a catalyst having a high visible light response is inevitably required.

Bismuth oxychloride (BiOCl) is a semiconductor with a forbidden band width of 3.46eV, but can only utilize ultraviolet light in sunlight, so that the practical application of the bismuth oxychloride is limited. How to improve the morphology of the material by improving the preparation method so as to improve the photocatalytic performance of the material is the key point of research in the field, so the invention provides the preparation method of the BiOCl photocatalyst with super-strong degradation effect.

Disclosure of Invention

Based on the technical problems in the background art, the invention provides a preparation method of a BiOCl photocatalyst with super-strong degradation effect.

The technical scheme of the invention is as follows:

a preparation method of a BiOCl photocatalyst with super-strong degradation effect comprises the following steps:

A. dissolving a proper amount of bismuth nitrate in a mixed solution of deionized water and ethanol, and stirring to obtain a clear solution, wherein the concentration of the bismuth nitrate is 0.1-0.3 mol/L;

B. weighing ammonium chloride, glycerol and oleic acid, adding into the solution, and stirring uniformly;

C. transferring the mixed solution obtained in the step B into a stainless steel reaction kettle with a polytetrafluoroethylene lining, heating for 8-12h at the temperature of 120-150 ℃, and naturally cooling;

D. filtering, repeatedly washing the solid with ethanol for 3-5 times, and spray drying.

Preferably, in the step a, the volume ratio of the deionized water to the ethanol is 1: (6-10).

Preferably, in the step B, the amount of the ammonium chloride is 2 to 4 times of the amount of the bismuth nitrate.

Preferably, in the step B, the volume ratio of the oleic acid to the ethanol is (1-3): 10; the volume ratio of the glycerol to the ethanol is (0.2-0.5): 10.

the invention has the advantages that: according to the BiOCl photocatalyst with the super-strong degradation effect, the visible light catalysis efficiency of the photocatalyst is remarkably improved by preparing the BiOCl into a special micro-nano ellipsoidal structure with the length of 300-800nm, the width of 150-300nm and the thickness of 50-100 nm; and because the BiOCl photocatalyst has a stable structure, the BiOCl photocatalyst has good reusability, so that the cost of the photocatalyst is lower, and the BiOCl photocatalyst can be more widely applied to the field of environmental pollution treatment.

Drawings

FIG. 1: SEM image of BiOCl photocatalyst prepared by the method of example 1.

Detailed Description