阅读说明：本技术 一种NiS-g-C3N4光催化剂的制备方法 (NiS-g-C3N4Method for preparing photocatalyst ) 是由 梁飞燕 刘肖月 李瑞鑫 李凯 王九鑫 于 2019-12-31 设计创作，主要内容包括：本发明公开了一种NiS-g-C<Sub>3</Sub>N<Sub>4</Sub>光催化剂的制备方法,属于光催化剂技术领域。该方法包括：步骤(1)：称取0.235g的g-C<Sub>3</Sub>N<Sub>4</Sub>放入烧杯中,然后加入50mL去离子水和NiS,使用磁力搅拌机搅拌1h；步骤(2)：搅拌完成后,加入体积浓度为0.1M的硝酸镍溶液,继续搅拌1h；步骤(3)：搅拌完成后,再加入体积浓度为0.1M的硫化钠溶液,常温搅拌一夜,得到混合物；步骤(4)：将混合物使用无水乙醇和去离子水离心洗涤至中性,然后移至培养皿中60℃烘干一夜,得到NiS-g-C<Sub>3</Sub>N<Sub>4</Sub>。在本发明中引入NiS,构建了NiS-g-C<Sub>3</Sub>N<Sub>4</Sub>体系,NiS的引入,加速了NiS-g-C<Sub>3</Sub>N<Sub>4</Sub>的电荷的分离,从而提高了光催化剂的氧化还原能力和光催化活性。(Disclosure of the inventionNiS-g-C 3 N 4 A preparation method of a photocatalyst belongs to the technical field of photocatalysts. The method comprises the following steps: step (1): 0.235g of g-C was weighed 3 N 4 Putting the mixture into a beaker, adding 50mL of deionized water and NiS, and stirring for 1h by using a magnetic stirrer; step (2): after stirring, adding a nickel nitrate solution with the volume concentration of 0.1M, and continuously stirring for 1 h; and (3): after stirring, adding a sodium sulfide solution with the volume concentration of 0.1M, and stirring at normal temperature overnight to obtain a mixture; and (4): centrifugally washing the mixture to neutrality by using absolute ethyl alcohol and deionized water, and then transferring the mixture to a culture dish to dry at 60 ℃ overnight to obtain NiS-g-C 3 N 4 . NiS is introduced in the invention to construct NiS-g-C 3 N 4 The introduction of NiS accelerates the introduction of NiS-g-C 3 N 4 Thereby improving the redox ability and photocatalytic activity of the photocatalyst.)

1. NiS-g-C₃N₄A method for preparing a photocatalyst, the method comprising: step (1): 0.235g of g-C was weighed₃N₄Putting the mixture into a beaker, adding 50mL of deionized water and NiS, and stirring for 1h by using a magnetic stirrer;

step (2): after stirring, adding a nickel nitrate solution with the volume concentration of 0.1M, and continuously stirring for 1 h;

and (3): after stirring, adding a sodium sulfide solution with the volume concentration of 0.1M, and stirring at normal temperature overnight to obtain a mixture;

and (4): and (3) centrifugally washing the mixture to be neutral by using absolute ethyl alcohol and deionized water while stirring, and then transferring the mixture to a culture dish to be dried overnight at 60 ℃ to obtain NiS-g-C3N 4.

2. NiS-g-C according to claim 1₃N₄The preparation method of the photocatalyst is characterized in that the mass of the NiS added in the step (1) is g-C₃N₄0.5 to 2.0 percent of the mass.

3. NiS-g-C according to claim 2₃N₄The preparation method of the photocatalyst is characterized in that the mass of the NiS added in the step (1) is preferably g-C₃N₄0.5% of the mass.

4. NiS-g-C according to claim 1₃N₄The preparation method of the photocatalyst is characterized in that the volume of the nickel nitrate solution added in the step (2) is 0.125-0.5 mL.

5. NiS-g-C according to claim 4₃N₄The preparation method of the photocatalyst is characterized in that the volume of the nickel nitrate solution added in the step (2) is preferably 0.125 mL.

6. NiS-g-C according to claim 1₃N₄The preparation method of the photocatalyst is characterized in that the volume of the sodium sulfide solution added in the step (3) is 0.15mL-0.6 mL.

7. NiS-g-C according to claim 6₃N₄The method for preparing the photocatalyst is characterized in that the volume of the sodium sulfide solution added in the step (3) is preferably 0.15 mL.

Technical Field

The invention relates to the technical field of photocatalysts, in particular to a NiS-g-C photocatalyst₃N₄A preparation method of the photocatalyst.

Background

The photocatalyst is a general name of chemical substances capable of playing a role in catalysis under the excitation of photons, and is mainly applied to a plurality of advanced fields such as environmental purification, self-cleaning materials, advanced new energy, cancer medical treatment, high-efficiency antibiosis and the like.

The photocatalytic technique is one of the methods for eliminating environmental pollution by means of sunlight, and in the prior art, various visible-light-responsive oxide, sulfide and polymerized semiconductor photocatalysts are sequentially valued, such as BiVO₄、Bi₂MoO₆、CdS、g-C₃N₄However, the photocatalytic activity of single-component semiconductor photocatalysts is limited by the high recombination rate of photoinduced electron-hole pairs and the low absorption capacity of visible light (less than 450nm), so that these semiconductor photocatalysts show unsatisfactory photoactivity, and therefore, in order to improve the photocatalytic activity of photocatalysts, a composite photocatalyst with stronger visible light photocatalytic performance is urgently needed to degrade environmental pollutants.

Disclosure of Invention

In order to solve the problems in the prior art, embodiments of the present invention provide a method for preparing a photocatalyst. The method bagComprises the following steps: step (1): 0.235g of g-C was weighed₃N₄Putting into a beaker, adding 50ml of deionized water and NiS, and stirring for 1h by using a magnetic stirrer; step (2): after stirring, adding a nickel nitrate solution with the volume concentration of 0.1M, and continuously stirring for 1 h; and (3): after stirring, adding a sodium sulfide solution with the volume concentration of 0.1M, and stirring at normal temperature overnight to obtain a mixture; and (4): centrifugally washing the mixture to neutrality by using absolute ethyl alcohol and deionized water, and then transferring the mixture to a culture dish to be dried overnight at 60 ℃ to obtain NiS-g-C₃N₄。

Further, the mass of the NiS added in the step (1) is g-C₃N₄0.5 to 2.0 percent of the mass.

Further, the mass of said NiS added in said step (1) is preferably said g-C₃N₄0.5% of the mass.

Further, the volume of the nickel nitrate solution added in the step (2) is 0.125 mL-0.5 mL.

Further, the volume of the nickel nitrate solution added in the step (2) is preferably 0.125 mL.

Further, the volume of the sodium sulfide solution added in the step (3) is 0.15mL-0.6 mL.

Further, the volume of the sodium sulfide solution added in the step (3) is preferably 0.15 mL.

The technical scheme provided by the embodiment of the invention has the following beneficial effects: NiS is introduced in the invention to construct NiS-g-C₃N₄The introduction of NiS accelerates the introduction of NiS-g-C₃N₄Thereby improving the redox ability and photocatalytic activity of the photocatalyst.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 shows a NiS-g-C according to an embodiment of the present invention₃N₄A flow chart of a preparation method of the photocatalyst;

FIG. 2 is g-C provided by the present invention₃N₄And NiS-g-C of different mass fractions₃N₄Degradation curve for rose bengal;

FIG. 3 is g-C provided by the present invention₃N₄And 0.5% -NiS-g-C₃N₄Fluorescence spectrum of (2).

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.