阅读说明：本技术 N-g-C3N4可见光催化材料制备方法及应用 (N-g-C3N4Preparation method and application of visible light catalytic material ) 是由 王锦 高博儒 杨帆 窦蒙蒙 李树铭 于 2019-09-06 设计创作，主要内容包括：本发明提供了一种N-g-C_3N_4可见光催化材料制备方法及应用,包括：(1)将富氮前驱体和三聚氰胺以质量比为0.05:3～0.5:3混合,混合后充分研磨均匀得到混合物；(2)将研磨均匀的所述混合物放入马弗炉中,升温至500℃并恒温煅烧两小时,自然冷却后将煅烧产物研磨得到N-g-C_3N_4。通过本发明方法得到的N-g-C_3N_4降解染料废水和抗生素废水具有较高的催化效率,比传统的g-C_3N_4的催化效率提高3-4倍。(The invention provides N-g-C 3 N 4 The preparation method and application of the visible light catalytic material comprise the following steps: (1) mixing the nitrogen-rich precursor and melamine according to the mass ratio of 0.05: 3-0.5: 3, and fully and uniformly grinding the mixture to obtain a mixture; (2) putting the uniformly ground mixture into a muffle furnace, heating to 500 ℃, calcining at constant temperature for two hours, naturally cooling, and grinding the calcined product to obtain N-g-C 3 N 4 . By the inventionN-g-C obtained by the method 3 N 4 The catalytic efficiency of degrading dye wastewater and antibiotic wastewater is higher than that of the traditional g-C 3 N 4 The catalytic efficiency of the catalyst is improved by 3 to 4 times.)

1. N-g-C₃N₄The preparation method of the visible light catalytic material is characterized by comprising the following steps:

(1) Mixing the nitrogen-rich precursor and melamine according to the mass ratio of 0.05: 3-0.5: 3, and fully and uniformly grinding the mixture to obtain a mixture;

(2) Putting the uniformly ground mixture into a muffle furnace, heating to 500 ℃, calcining at constant temperature for two hours, naturally cooling, and grinding the calcined product to obtain N-g-C₃N₄。

2. The method of claim 1, wherein the nitrogen-rich precursor is 3-amino-1, 2,4 triazole or 5-amino-1H-4 oxazole.

3. The method according to claim 1, wherein the mass ratio of the nitrogen-rich precursor to the melamine is 0.1:3 to 0.3: 3.

4. The method of claim 1, wherein the mass ratio of the nitrogen-rich precursor to the melamine is 0.2: 3.

5. The method according to claim 1, wherein the temperature rise rate in the step (2) is 5-10 ℃/min.

6. N-g-C prepared by the preparation method of any one of claims 1 to 5₃N₄The visible light catalytic material is characterized by being used for sewage treatment of organic dyes and antibiotics and performing visible light catalytic degradation on organic pollutants of the organic dyes and the antibiotics.

Technical Field

The invention relates to the technical field of environment and chemistry, in particular to N-g-C₃N₄A preparation method and application of a visible light catalytic material.

Background

Organic dye pollution is one of important sources of water environment pollution, and with the rapid development of world industry, especially in developing countries, the annual yield of organic dyes is 7 multiplied by 10⁵t, is widely used in the industries of paper making, leather processing, textile dyeing, cosmetics, pharmaceutical manufacturing and the like. China is a large country for producing and using antibiotics, and various antibiotics such as amoxicillin, cefotaxime sodium and the like can be detected in environmental water at present. The existing methods for solving the problem of organic pollution of dyes, antibiotics and the like in environmental water bodies comprise biodegradation, physical and chemical adsorption, advanced oxidation, visible light catalysis and the like. The visible light catalysis method can save energy and degrade organic pollution, so the method has attracted extensive attention.

Graphite phase carbon nitride (g-C)₃N₄) As a non-metal catalyst, the catalyst has the advantages of rich raw materials, good stability, no toxicity, simple preparation and narrow band gap (2.7eV), and has catalytic activity under the condition of visible light. However, conventional g-C₃N₄Can only absorb visible light below 450nm, and greatly limits g-C₃N₄The practical application of (1). For g-C₃N₄Regulating structure and controlling g-C₃N₄The ratio of carbon to nitrogen (C/N) in the structure can be changed by g-C₃N₄Energy band structure of (1), such that g-C₃N₄the narrowing of the band gap is advantageous for absorbing visible light of a wider wavelength.

Therefore, a catalytic material which can be used for visible light catalytic degradation of organic wastewater and can improve catalytic efficiency is needed.

Disclosure of Invention

The invention provides N-g-C₃N₄A preparation method and application of a visible light catalytic material, which aims to solve the defects in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme.

The invention provides N-g-C₃N₄The preparation method of the visible light catalytic material comprises the following steps:

(1) Mixing the nitrogen-rich precursor and melamine according to the mass ratio of 0.05: 3-0.5: 3, and fully and uniformly grinding the mixture to obtain a mixture;

(2) Putting the uniformly ground mixture into a muffle furnace, heating to 500 ℃, calcining at constant temperature for two hours, naturally cooling, and grinding the calcined product to obtain N-g-C₃N₄。

Preferably, the nitrogen-rich precursor is 3-amino-1, 2,4 triazole or 5-amino-1H-4 oxazole.

Preferably, the mass ratio of the nitrogen-rich precursor to the melamine is 0.1: 3-0.3: 3.

Preferably, the mass ratio of the nitrogen-rich precursor to melamine is 0.2: 3.

Preferably, the temperature rise rate in the step (2) is 5-10 ℃/min.

In another aspect, N-g-C prepared by the above-described preparation method₃N₄The visible light catalytic material is used for sewage treatment of organic dyes and antibiotics and visible light catalytic degradation of organic pollutants of the organic dyes and the antibiotics.

From the above-described N-g-C of the present invention₃N₄The technical scheme provided by the preparation method and the application of the visible light catalytic material shows that the N-g-C obtained by the invention₃N₄The absorption intensity of the photocatalytic material to visible light irradiation is higher than that of the traditional g-C₃N₄And because the band gap is reduced, the migration path of photo-generated electrons is shortened, the recombination of electron-hole pairs is effectively inhibited, and the catalytic performance of the photocatalyst is fully exerted; by using the N-g-C of the invention₃N₄the catalytic efficiency of degrading dye wastewater and antibiotic wastewater is higher than that of the traditional g-C₃N₄The catalytic efficiency is improved by 3-4 times, and the antibacterial activity is better.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are 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 N-g-C₃N₄And g-C₃N₄UV-vis diagram of (1);

FIG. 2 shows N-g-C₃N₄And g-C₃N₄XRD pattern of (a);

FIG. 3 is N-g-C₃N₄And g-C₃N₄PL map of (2);

FIG. 4 shows three N-g-C₃N₄With conventional g-C₃N₄A dye visible light catalysis experiment result graph;

FIG. 5 shows three N-g-C₃N₄With conventional g-C₃N₄A graph of the visible light catalysis result of cefotaxime sodium;

FIG. 6 shows the use of N2-g-C₃N₄A result chart of a cycle experiment for catalyzing and degrading cefotaxime sodium.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, and/or operations, but do not preclude the presence or addition of one or more other features, integers, steps, and/or operations. It should be understood that the term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including 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. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

For the convenience of understanding of the embodiments of the present invention, the following description will be further explained by taking several specific embodiments as examples with reference to the drawings, and the embodiments of the present invention are not limited thereto.