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Preparation method for photocatalysis composite material made from graphite oxide and carbon nitride

A technology of composite materials and carbon nitride, which is applied in the field of preparation of photocatalytic composite materials, can solve the problems of poor dispersion of carbon nitride, time-consuming sonochemical method, unsuitable for large-scale application, etc., achieving low cost and suitable for large-scale The effect of simple production and preparation process

Active Publication Date: 2015-03-11
INST OF CHEM CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

However, the sonochemical method is time-consuming (more than 10 hours); in addition, due to the poor dispersion of carbon nitride in water, this method is not suitable for large-scale applications

Method used

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  • Preparation method for photocatalysis composite material made from graphite oxide and carbon nitride

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Experimental program
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Effect test

Embodiment 1

[0017] (1) At room temperature, put 5 g of cyanamide in a crucible with a lid, heat it to a temperature of 450° C. in an air atmosphere in a horse-boiler furnace for 6 hours, and the heating rate is 5° C. / min. After cooling, a yellow solid powder is obtained. carbon nitride;

[0018] (2) Disperse 1.5 g of carbon nitride obtained in step (1) in 10 mL of sulfuric acid with a mass concentration of 98%, stir for 1 hour, centrifuge, wash the resulting solid, and dry to obtain acidified carbon nitride;

[0019] (3) Disperse 100 mg of the acidified carbon nitride obtained in step (2) in 10 mL of deionized water, and disperse it ultrasonically for 30 minutes; then add 1 mL of graphite oxide aqueous solution with a concentration of 1 mg / mL under stirring to produce a gray precipitate, and stop stirring , ultrasonically dispersed for 30 minutes; after the obtained precipitate was filtered and dried, a photocatalytic composite material of graphite oxide and carbon nitride with a mass rat...

Embodiment 2

[0021] (1) At room temperature, place 5g of dicyandiamide in a tube furnace, heat it to a temperature of 500°C for 4 hours in a nitrogen atmosphere at a heating rate of 5°C / min, and obtain yellow solid powder nitrogen after cooling. carbonization;

[0022] (2) Disperse 1 gram of carbon nitride obtained in step (1) in 10 mL of sulfuric acid with a mass concentration of 80%, stir for 2 hours, centrifuge, wash the resulting solid, and dry to obtain acidified carbon nitride;

[0023] (3) Disperse 100 mg of the acidified carbonitride obtained in step (2) in 20 mL of deionized water, and disperse ultrasonically for 30 minutes; then add 5 mL of graphite oxide aqueous solution with a concentration of 1 mg / mL under stirring to produce a gray precipitate, and stop stirring , ultrasonically dispersed for 30 minutes; after the obtained precipitate was filtered and dried, a photocatalytic composite material of graphite oxide and carbon nitride with a mass ratio of graphite oxide and carbon...

Embodiment 3

[0025] (1) At room temperature, put 5 g of melamine in a crucible with a lid, heat it to a temperature of 650° C. in a muffle furnace under an argon atmosphere and bake it for 1 hour at a heating rate of 5° C. / min. After cooling, a yellow solid powder is obtained carbon nitride;

[0026] (2) Disperse 0.2 g of carbon nitride obtained in step (1) in 10 mL of sulfuric acid with a mass concentration of 10%, stir for 5 hours, centrifuge, wash the resulting solid, and dry to obtain acidified carbon nitride;

[0027] (3) Disperse 100 mg of the acidified carbon nitride obtained in step (2) in 50 mL of deionized water, and disperse it ultrasonically for 30 minutes; then add 50 mL of graphite oxide aqueous solution with a concentration of 1 mg / mL under stirring to produce a gray precipitate, and stop stirring , ultrasonically dispersed for 30 minutes; after the obtained precipitate was filtered and dried, a photocatalytic composite material of graphite oxide and carbon nitride with a ma...

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Abstract

The invention belongs to the field of preparation of photocatalysis materials, and particularly relates to a preparation method for a photocatalysis composite material made from graphite oxide and carbon nitride. The preparation method comprises the steps that a nitrogen-containing compound serves as a precursor and is subjected to high-temperature roasting, and then carbon nitride is obtained; the carbon nitride is acidized by sulfuric acid, so that the surface of the carbon nitride is positively charged; the carbon nitride with the positively charged surface and negatively charged graphite oxide are assembled through electrostatic adsorption, and the photocatalysis composite material made from the graphite oxide and the carbon nitride is obtained. Raw materials used for preparing the photocatalysis composite material from the graphite oxide and the carbon nitride are abundant, the prepared photocatalysis composite material made from the graphite oxide and the carbon nitride is high in photocatalytic activity, low in cost and suitable for large-scale production, and the preparation process is simple.

Description

technical field [0001] The invention belongs to the field of photocatalytic material preparation, in particular to a method for preparing photocatalytic composite materials of graphite oxide and carbon nitride. Background technique [0002] Carbon nitride is a class of organic semiconductor photocatalytic materials widely used in photolysis of water and photodegradation of organic pollutants. Carbon nitride is generally prepared by polymerization of nitrogen-containing precursors at high temperature. However, the bulk carbon nitride prepared by this method has low specific surface area, large band gap, and serious photogenerated electron-hole recombination, which limits its large-scale application in the fields of energy and environmental photocatalysis. In response to this problem, researchers have modified carbon nitride by various methods, such as loading, pore formation, copolymerization and modification. [0003] Graphene is a two-dimensional planar macromolecule comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24
Inventor 黄志军袁国卿李峰波陈兵峰
Owner INST OF CHEM CHINESE ACAD OF SCI
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