A graphene oxide quantum dot/oxygen-doped porous carbon nitride/graphene oxide ternary airgel photocatalyst

A graphene quantum dot and photocatalyst technology, applied in the field of photocatalytic materials, can solve the problems of unfavorable recycling of powder carbon nitride catalyst, small specific surface area of ​​bulk carbon nitride, unsatisfactory photocatalytic activity, etc. Effects of photogenerated carrier mobility, improved adsorption capacity and recycling rate, improved separation efficiency and photoresponse range

Active Publication Date: 2020-10-27
JIANGNAN UNIV
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Problems solved by technology

[0003] However, the bulk carbon nitride prepared by the traditional polycondensation method has a small specific surface area, low utilization rate of visible light, and easy recombination of photogenerated electron-hole pairs, resulting in unsatisfactory photocatalytic activity.
In addition, the powder carbon nitride catalyst is not conducive to recycling, and also seriously restricts the prospect of its practical application.

Method used

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  • A graphene oxide quantum dot/oxygen-doped porous carbon nitride/graphene oxide ternary airgel photocatalyst
  • A graphene oxide quantum dot/oxygen-doped porous carbon nitride/graphene oxide ternary airgel photocatalyst
  • A graphene oxide quantum dot/oxygen-doped porous carbon nitride/graphene oxide ternary airgel photocatalyst

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Embodiment 1

[0037] A kind of graphene oxide quantum dot / oxygen-doped porous carbon nitride / graphene oxide ternary airgel, the preparation method of described photocatalyst comprises the steps:

[0038] First, melamine was calcined in a muffle furnace at 550 °C for 4 h, and the bulk g-C was prepared at a heating rate of 10 °C / min in an air atmosphere. 3 N 4 (BCN); Disperse 1.5g of BCN in 135mL of water and ultrasonically (560W, 40kHz) for 30min, then transfer the dispersion to a Teflon-lined stainless steel autoclave, and heat at 160°C for 12h; thoroughly wash the hydrothermal reaction with water The resulting precipitate was dried and ground into powder, and the obtained pale yellow powder product was oxygen-doped porous carbon nitride (PCNO). Then, 15 mg of graphite oxide was dispersed in 30 mL of water and ultrasonicated (560 W, 40 kHz) for 2 h to obtain small-sized nanosheet GO dispersion 1 (0.5 mg / mL); 8 mL of 68% concentrated nitric acid and 3 mL of 98% concentrated sulfuric acid we...

Embodiment 2

[0040] A kind of graphene oxide quantum dot / oxygen-doped porous carbon nitride / graphene oxide ternary airgel, the preparation method of described photocatalyst comprises the steps:

[0041] First, melamine was calcined in a muffle furnace at 500 °C for 1 h, and the bulk g-C was prepared at a heating rate of 1 °C / min in an air atmosphere. 3 N 4 (BCN); Disperse 1.5g of BCN in 30mL of water and ultrasonically (200W, 10kHz) for 5min, then transfer the dispersion to a Teflon-lined stainless steel autoclave, and heat at 120°C for 8h; wash the hydrothermal reaction thoroughly with water The resulting precipitate was dried and ground into powder, and the obtained pale yellow powder product was oxygen-doped porous carbon nitride (PCNO). Then, 15 mg of graphite oxide was dispersed in 150 mL of water and ultrasonicated (200 W, 10 kHz) for 0.5 h to obtain small-sized nanosheet GO dispersion 1 (0.1 mg / mL); 15 mL of 60% concentrated nitric acid and 10 mL of 90% concentrated sulfuric acid w...

Embodiment 3

[0043] A kind of graphene oxide quantum dot / oxygen-doped porous carbon nitride / graphene oxide ternary airgel, the preparation method of described photocatalyst comprises the steps:

[0044] First, melamine was calcined in a muffle furnace at 600 °C for 8 h, and the bulk g-C was prepared at a heating rate of 12 °C / min in an air atmosphere. 3 N 4 (BCN); Disperse 1g of BCN in 150mL of water and ultrasonically (800W, 50kHz) for 60min, then transfer the dispersion to a Teflon-lined stainless steel autoclave, and heat at 200°C for 16h; thoroughly wash the hydrothermal reaction with water Precipitation, drying and grinding into powder, the obtained light yellow powder product is oxygen-doped porous carbon nitride (PCNO). Then, 15 mg of graphite oxide was dispersed in 15 mL of water and ultrasonicated (800 W, 50 kHz) for 10 h to obtain small-sized nanosheet GO dispersion 1 (1 mg / mL); 15 mL of 70% concentrated nitric acid and 3 mL of 99% concentrated sulfuric acid were mixed with the ...

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Abstract

The invention discloses a graphene oxide quantum dot / oxygen doped porous carbon nitride / graphene oxide ternary aerogel photocatalyst. The preparation method of the photocatalyst comprises the following steps: by taking melamine as a raw material, performing a hydrothermal reaction so as to obtain PCNO (oxygen doped porous carbon nitride); dispersing graphite oxide into water so as to obtain a graphene oxide nanosheet GO (graphene oxide) dispersion 1, adding concentrated nitric acid and concentrated sulfuric acid, performing a heating reflux reaction, and performing filtering dialysis so as toobtain an ox<->GQDs dispersion; dispersing PCNO into water, adding the ox<->GQDs dispersion, performing stirring and mixing, washing and drying precipitate, and performing grinding so as to obtain PCNGD (graphene oxide quantum dot / oxygen doped porous carbon nitride); and dispersing the PCNGD and graphite oxide into water respectively so as to obtain a PCNGD dispersion and a GO dispersion 2, performing ultrasonic mixing, sequentially adding ethidene diamine and CTAB (cetyltrimethyl ammonium bromide), performing a heating reaction respectively, performing cooling so as to obtain PCNGD / GO hydrogel, and performing freezing drying, so as to obtain the PCNGD-GOA photocatalyst. The method has the characteristics of being efficient, green and mild.

Description

technical field [0001] The invention relates to the technical field of photocatalytic materials, in particular to a method for preparing a graphene oxide quantum dot / oxygen-doped porous carbon nitride / graphene oxide ternary airgel photocatalyst by combining a self-assembly method and a crosslinking method. Background technique [0002] Carbon nitride is a new type of non-metallic organic semiconductor visible light catalyst. Due to its low price, simple preparation, high stability, and no biological toxicity, it has good application value in the degradation of pollutants and antibacterial. [0003] However, the bulk carbon nitride prepared by the traditional polycondensation method has small specific surface area, low utilization rate of visible light, and easy recombination of photogenerated electron-hole pairs, resulting in unsatisfactory photocatalytic activity. In addition, the powder carbon nitride catalyst is not conducive to recycling, and also seriously restricts the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J35/10
CPCB01J27/24B01J35/004B01J35/1004
Inventor 徐婧王周平黄金
Owner JIANGNAN UNIV
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