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Silver/graphene oxide/carbon nitride composite photocatalytic material and preparation method thereof

A composite photocatalysis, graphene technology, applied in physical/chemical process catalysts, chemical instruments and methods, water/sludge/sewage treatment, etc. and other problems, to achieve the effect of simple process, energy saving and environmental protection performance, and low cost

Inactive Publication Date: 2015-03-25
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] In recent years, graphitic carbon nitride g-C 3 N 4 Due to its excellent chemical stability, special electronic energy band structure, no metal components, and response to visible light, it has attracted great interest from researchers; however, due to the intrinsic characteristics of polymers, carbon nitride as a photocatalytic material There are shortcomings such as small specific surface area, high binding energy for photogenerated carriers, serious photogenerated electron-hole recombination, low quantum efficiency, and large band gap, which seriously restrict its large-scale application in the fields of energy and environment.
[0003] Graphene is a new material with a single-layer sheet structure composed of carbon atoms. The thickness of a single-layer carbon source not only makes it suitable for the growth of functional nanomaterials, but also has good electronic conductivity. It has been recognized as a catalyst. Ideal carrier material; graphene oxide is used as the precursor material in the experiment, and the nucleation and growth of silver phosphate are controlled during the reaction, so that the final zinc oxide / silver phosphate / graphene composite photocatalytic material has a uniform morphology and relatively Small size; graphene's high light transmittance and high specific surface area make the prepared composite photocatalytic material have good dispersibility and adsorption in solution; its high electrical conductivity further accelerates the separation of photogenerated electron pairs , prolong the life of the active components, and enhance the catalytic activity of the composite photocatalytic material; at present, using dicyandiamine or melamine, graphene oxide, and silver nitrate as raw materials, the ion exchange method in aqueous solution is used to synthesize photocatalysts with heterojunction structures. Silver / Graphene Oxide / Carbon Nitride Composite Photocatalytic Material and Its Application to Photocatalytic Degradation of Organic Pollutants and Purification of Water Resources Has Not Been Reported

Method used

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  • Silver/graphene oxide/carbon nitride composite photocatalytic material and preparation method thereof
  • Silver/graphene oxide/carbon nitride composite photocatalytic material and preparation method thereof
  • Silver/graphene oxide/carbon nitride composite photocatalytic material and preparation method thereof

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Embodiment 1

[0028] Disperse 10 mg of graphene oxide in 100 ml of deionized water and ultrasonically obtain a graphene oxide dispersion for 5 hours; weigh 15 mmol (2.54 g) of silver nitrate in 50 ml of deionized water and stir for 10 min to obtain a silver nitrate solution; The silver nitrate solution was added dropwise to the above-mentioned graphene oxide dispersion under magnetic stirring. After the dropwise addition, the solution was continued to stir at room temperature for 6 h to obtain a mixed precursor solution A; weigh 15 mmol (1.26 g) of dicyandiamide solution Dicyandiamine dispersion was obtained in 50 ml of deionized water; under the condition of magnetic stirring, the dicyandiamine dispersion was slowly added dropwise to the mixed precursor solution A, and the mixed solution obtained after the dropwise addition was continued to stir for 6 h After standing still overnight, the obtained product was suction-filtered, washed repeatedly with absolute ethanol and deionized water, and...

Embodiment 2

[0030] Disperse 20 mg of graphene oxide in 100 ml of deionized water and ultrasonically obtain a graphene oxide dispersion for 5 hours; weigh 15 mmol (2.54 g) of silver nitrate in 50 ml of deionized water and stir for 10 min to obtain a silver nitrate solution; The silver nitrate solution was added dropwise to the above-mentioned graphene oxide dispersion under magnetic stirring. After the dropwise addition, the solution was continued to stir at room temperature for 6 h to obtain a mixed precursor solution A; weigh 15 mmol (1.26 g) of dicyandiamide solution Dicyandiamine dispersion was obtained in 50 ml of deionized water; the dicyandiamine dispersion was slowly added dropwise to the mixed precursor solution A under the condition of magnetic stirring, and the mixed solution obtained after the dropwise addition was continued to stir for 6 hours After standing still overnight, the obtained product was suction-filtered, washed repeatedly with absolute ethanol and deionized wat...

Embodiment 3

[0032] Disperse 50 mg of graphene oxide in 100 ml of deionized water and ultrasonically obtain a graphene oxide dispersion for 5 hours; weigh 15 mmol (2.54 g) of silver nitrate in 50 ml of deionized water and stir for 10 min to obtain a silver nitrate solution; The silver nitrate solution was added dropwise to the above-mentioned graphene oxide dispersion under magnetic stirring. After the dropwise addition, the solution was continued to stir at room temperature for 6 h to obtain a mixed precursor solution A; weigh 15 mmol (1.26 g) of dicyandiamide solution Dicyandiamine dispersion was obtained in 50 ml of deionized water; the dicyandiamine dispersion was slowly added dropwise to the mixed precursor solution A under the condition of magnetic stirring, and the mixed solution obtained after the dropwise addition was continued to stir for 6 hours After standing still overnight, the obtained product was suction-filtered, washed repeatedly with absolute ethanol and deionized wat...

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Abstract

The invention relates to a silver / graphene oxide / carbon nitride composite photocatalytic material and a preparation method thereof. The preparation method comprises the following steps: dispersing graphene oxide into deionized water, and carrying out ultrasonic treatment to obtain graphene oxide dispersion liquid; dropwise adding a silver nitrate solution into the graphene oxide dispersion liquid under magnetic stirring so as to obtain a mixed solution A; slowly and dropwise adding dicyanodiamine dispersion liquid into a mixed pecursor solution A under the magnetic stirring, then continuing to stir the obtained mixed solution, standing for one night, carrying out suction filtration on an obtained product, repeatedly washing the product by virtue of absolute ethanol and deionized water, and carrying out vacuum drying; putting the obtained product into a proper crucible, covering the crucible, putting the crucible into a high temperature atmosphere oven, and sintering in the presence of nitrogen protection so as to obtain a powdery sample. The silver / graphene oxide / carbon nitride composite photocatalytic material presents a relatively high activity to an organic dye, namely Rhodamin B under visible light excitation and has wide practical value and application prospect in the fields of preparation techniques of heterojunction photocatalytic materials as well as sewage treatment.

Description

technical field [0001] The invention relates to a silver / graphene oxide / carbon nitride composite photocatalytic material and a preparation method thereof, in particular to a method for preparing silver / graphene oxide / carbon nitride composite photocatalytic material by ion exchange in aqueous solution , which belongs to the field of composite materials, photocatalytic technology and water pollution control. Background technique [0002] In recent years, graphitic carbon nitride g-C 3 N 4 Due to its excellent chemical stability, special electronic energy band structure, no metal components, and response to visible light, it has attracted great interest from researchers; however, due to the intrinsic characteristics of polymers, carbon nitride as a photocatalytic material There are shortcomings such as small specific surface area, high binding energy for photogenerated carriers, severe photogenerated electron-hole recombination, low quantum efficiency, and large band gap, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/30C02F101/38
CPCY02W10/37
Inventor 秦洁玲杨小飞李荣唐华
Owner JIANGSU UNIV
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