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Photocatalyst for efficiently degrading tetracycline under visible light and preparation method and application of photocatalyst

A photocatalyst, visible light technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve high specific surface area, promote separation, and increase the number of reactive sites

Pending Publication Date: 2020-12-25
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few reports on catalysts and their preparation methods for efficiently degrading tetracycline under visible light conditions.

Method used

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  • Photocatalyst for efficiently degrading tetracycline under visible light and preparation method and application of photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation method of the graphitic phase carbon nitride that efficiently degrades tetracycline under visible light of the present invention comprises the following steps:

[0028] (1) At room temperature, melamine and cyanuric acid are put into a beaker filled with 50 milliliters of water in a mass ratio of 1:0.5, and stirred evenly to obtain a mixed solution;

[0029] (2) The mixed solution obtained in step (1) is subjected to hydrothermal treatment, the hydrothermal temperature is 80° C., the hydrothermal time is 2 hours, and naturally cooled after the end;

[0030] (3) Transfer the cold mixed solution obtained in step (2) into a petri dish, and perform freeze-drying treatment at a pressure of 4.0 Pa and a temperature of -70°C. The freeze-drying time is 12 hours, and the precursor is obtained after completion;

[0031] (4) Put the precursor obtained in step (3) into a ceramic crucible and cover it, put it into a muffle furnace, and heat it to 550°C at a heating r...

Embodiment 2

[0034] An embodiment of the preparation method of graphite phase carbon nitride efficiently degrading tetracycline under visible light of the present invention, the preparation method comprises the following steps:

[0035] (1) At room temperature, put melamine and cyanuric acid into a beaker filled with 50 milliliters of water in a mass ratio of 1:1, stir evenly to obtain a mixed solution;

[0036] (2) The mixed solution obtained in step (1) is subjected to hydrothermal treatment, the hydrothermal temperature is 80° C., the hydrothermal time is 2 hours, and naturally cooled after the end;

[0037] (3) Transfer the cold mixed solution obtained in step (2) into a petri dish, and perform freeze-drying treatment at a pressure of 4.0 Pa and a temperature of -70°C. The freeze-drying time is 12 hours, and the precursor is obtained after completion;

[0038] (4) Put the precursor obtained in step (3) into a ceramic crucible and cover it, put it into a muffle furnace, and heat it to 5...

Embodiment 3

[0041] An embodiment of the preparation method of graphite phase carbon nitride efficiently degrading tetracycline under visible light of the present invention, the preparation method comprises the following steps:

[0042] (1) At room temperature, put melamine and cyanuric acid into a beaker filled with 50 milliliters of water in a mass ratio of 1:1.5, stir well to obtain a mixed solution;

[0043] (2) The mixed solution obtained in step (1) is subjected to hydrothermal treatment, the hydrothermal temperature is 80° C., the hydrothermal time is 2 hours, and naturally cooled after the end;

[0044] (3) Transfer the cold mixed solution obtained in step (2) into a petri dish, and perform freeze-drying treatment at a pressure of 4.0 Pa and a temperature of -70°C. The freeze-drying time is 12 hours, and the precursor is obtained after completion;

[0045] (4) Put the precursor obtained in step (3) into a ceramic crucible and cover it, put it into a muffle furnace, and heat it to 5...

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Abstract

The invention belongs to the field of environmental catalysis, and discloses a photocatalyst for efficiently degrading tetracycline under visible light and a preparation method and application of thephotocatalyst. The preparation method of the photocatalyst comprises the following steps: mixing a nitrogen-containing compound in water, carrying out hydrothermal treatment, cooling, transferring into a culture dish, and carrying out freeze drying treatment to obtain a precursor; and putting the precursor into a closed environment for high-temperature roasting, and naturally cooling to obtain thegraphite-phase carbon nitride photocatalyst for efficiently degrading tetracycline under visible light. According to the preparation method, the raw materials are mixed for hydro-thermal treatment and freeze-drying treatment to obtain the precursor, the graphite-phase carbon nitride obtained through constant-temperature roasting under different conditions has a relatively high specific surface area, and the separation of photo-induced electrons and holes can be effectively promoted through the formation of material defects; therefore, the purpose of efficiently degrading 10 mg / L tetracyclinehydrochloride under visible light is achieved.

Description

technical field [0001] The invention belongs to the field of environmental catalysis, and in particular relates to a photocatalyst for efficiently degrading tetracycline under visible light, a preparation method and application thereof. Background technique [0002] The economic development of human society is accompanied by the emergence of various environmental pollution problems. Among them, the environmental pollution and ecotoxicological effects caused by antibiotics have become one of the world's major environmental problems. Tetracycline antibiotics play an important role in treating human and livestock diseases and promoting the growth of livestock and poultry, so they are widely used in the medical industry and animal husbandry. Tetracycline is stable in nature, difficult to degrade in the natural environment and has ecotoxicity. Therefore, the exploration of efficient degradation methods of tetracycline is of great practical value. [0003] Photocatalytic degradat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10B01J37/00C02F1/30C02F101/38
CPCB01J27/24B01J37/00C02F1/30C02F2101/38C02F2305/10B01J35/61B01J35/39
Inventor 刘自力梁家驰林璟左建良杨伟
Owner GUANGZHOU UNIVERSITY
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