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Graphite-like carbon nitride/graphene/graphene oxide composite aerogel and preparation method thereof

A composite technology of graphite phase carbon nitride and graphene, which is applied in chemical instruments and methods, chemical/physical processes, water treatment of special compounds, etc., can solve the problems of insufficient dye adsorption capacity and low photocatalytic efficiency, and achieve photodegradation Efficiency improvement, solution to low photocatalytic efficiency, and improvement of degradation efficiency

Pending Publication Date: 2021-11-09
XIAN UNIV OF TECH
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Problems solved by technology

[0012] However, the airgel materials involved in the above reports have insufficient adsorption capacity for dyes in photocatalytic experiments, and the photocatalytic efficiency is not high.

Method used

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  • Graphite-like carbon nitride/graphene/graphene oxide composite aerogel and preparation method thereof
  • Graphite-like carbon nitride/graphene/graphene oxide composite aerogel and preparation method thereof
  • Graphite-like carbon nitride/graphene/graphene oxide composite aerogel and preparation method thereof

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preparation example Construction

[0043] The invention provides a preparation method of graphite-like carbon nitride / graphene / graphene oxide composite airgel, such as figure 1 As shown, it specifically includes the following steps:

[0044] Step 1: Grind urea or melamine or a mixture of urea and melamine in any ratio into powder and place it in an alumina crucible, place the crucible in a muffle furnace, and raise the temperature from room temperature to 530-570 ° C, keep at 530-570 ° C for 3-4 hours, you can get graphite-like phase carbon nitride; alumina crucible can be 50mL or 100mL volume.

[0045] Step 2, mixing the graphite-like phase carbon nitride obtained in step 1 with distilled water, and ultrasonically vibrating the mixed liquid for 4-6 hours to obtain a graphite-like phase carbon nitride nanosheet aqueous dispersion;

[0046] In step 2, the mass ratio of graphite-like carbon nitride to distilled water is 1:2000.

[0047] Step 3, mix the graphite-like phase carbon nitride nanosheet aqueous disper...

Embodiment 1

[0057] Preparation of graphite-like phase carbon nitride / graphene / graphene oxide composite airgel with graphite-like phase carbon nitride nanosheet aqueous dispersion, graphene oxide aqueous solution, and vitamin C aqueous solution at a volume ratio of 12:10:3.

[0058] First, grind 30 g of urea into powder and place it in a 50 mL alumina crucible, place the crucible in a muffle furnace, raise the temperature from room temperature to 550 °C at a heating rate of 10 °C / min, and keep at 550 °C for 4 hours, that is Carbon nitride in a graphitic phase can be obtained.

[0059] Secondly, the graphite-like carbon nitride and distilled water were mixed at a mass ratio of 1:2000, and the mixed liquid was ultrasonically oscillated for 4 hours to obtain a 0.5 mg / mL aqueous dispersion of graphite-like carbon nitride nanosheets.

[0060] Third, mix 0.5 mg / mL graphitic-phase carbon nitride nanosheet aqueous dispersion with 6 mg / mL graphene oxide aqueous solution and 100 mg / mL vitamin C aque...

Embodiment 2

[0065] Preparation of graphite-like phase carbon nitride / graphene / graphene oxide composite airgel with graphite-like phase carbon nitride nanosheet aqueous dispersion, graphene oxide aqueous solution, and vitamin C aqueous solution at a volume ratio of 6:10:3.

[0066] First, grind 30g of urea into powder and place it in a 50mL alumina crucible, place the crucible in a muffle furnace, raise the temperature from room temperature to 530°C at a heating rate of 8°C / min, and keep it at 530°C for 4h , to obtain graphite-like carbon nitride.

[0067] Secondly, the graphite-like carbon nitride and distilled water were mixed at a mass ratio of 1:2000, and the mixed liquid was ultrasonically oscillated for 6 hours to obtain a 0.5 mg / mL aqueous dispersion of graphite-like carbon nitride nanosheets.

[0068] Third, mix 0.5 mg / mL graphitic phase carbon nitride nanosheet aqueous dispersion with 6 mg / mL graphene oxide aqueous solution and 100 mg / mL vitamin C aqueous solution at a volume rati...

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Abstract

The invention discloses a preparation method of graphite-like carbon nitride / graphene / graphene oxide composite aerogel. The preparation method specifically comprises the following steps: step 1, grinding urea or melamine or a mixture formed by mixing urea and melamine in any ratio into powder, and heating to prepare graphite-like carbon nitride; step 2, mixing the graphite-like phase carbon nitride obtained in the step 1 with distilled water; step 3, uniformly mixing the graphite-like phase carbon nitride nanosheet aqueous dispersion liquid with a graphene oxide aqueous solution and a vitamin C aqueous solution; step 4, performing high-speed centrifugation on the precursor sol; and step 5, drying the wet gel by using a freeze dryer to obtain the graphite-like carbon nitride / graphene / graphene oxide composite aerogel. The invention also provides the graphite-like carbon nitride / graphene / graphene oxide composite aerogel prepared by the method. Compared with graphite-like carbon nitride, the graphite-like carbon nitride / graphene / graphene oxide composite aerogel has the advantage that the degradation efficiency and degradation rate of organic dye degraded by a photocatalytic material are improved.

Description

technical field [0001] The invention belongs to the technical field of photocatalyst preparation and structure regulation, in particular to a graphite-like carbon nitride / graphene / graphene oxide composite airgel, and also to a graphite-like carbon nitride / graphene / graphene oxide Preparation method of composite airgel. Background technique [0002] Photocatalysis can directly use sunlight to degrade organic pollutants. It has the characteristics of low energy consumption, no secondary pollution and wide application range. It is an energy-saving and environmentally friendly organic sewage treatment technology. Research hotspots in academia and industry. The core of the photocatalytic reaction is the semiconductor photocatalyst, whose photocatalytic efficiency and cycle stability are the key factors affecting the pollutant removal effect. The earliest and most widely used semiconductor photocatalyst is TiO 2 , but its photocatalytic efficiency is not high. In recent years, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18B01J27/24B01J35/00B01J37/10C02F1/30C02F101/30
CPCB01J21/18B01J27/24B01J37/10C02F1/30C02F2305/10C02F2101/308B01J35/39
Inventor 沈洋白越越马德明李恩玲成凤娇袁超凡任铭欣郭建伟卜思捷梁枭吕玉洁沈鹏飞赵鸿远汪芳平
Owner XIAN UNIV OF TECH
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