Carbon nitride heterojunction photocatalyst and preparation method and application thereof

A technology of photocatalyst and carbon nitride, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of slow electron transfer rate, improve separation ability, improve dispersibility, improve absorption effect

Pending Publication Date: 2021-08-10
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Purpose of the invention: In order to solve the problem of slow electron transfer rate in existing microbial electrosynthesis, the present invention provides a preparation method of carbon nitride heterojunction photocatalyst electrode and its application in microbial electrosynthesis system

Method used

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  • Carbon nitride heterojunction photocatalyst and preparation method and application thereof
  • Carbon nitride heterojunction photocatalyst and preparation method and application thereof
  • Carbon nitride heterojunction photocatalyst and preparation method and application thereof

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Embodiment 1

[0031] Melamine was placed in a crucible and heated to 550°C in a muffle furnace, and kept at a constant temperature for 4 hours; after cooling to room temperature, it was ultrasonically treated in 0.1M nitric acid solution for 8 hours, finally washed to neutral with deionized water, and dried at 60°C. Depend on figure 1 It can be seen from XRD that after melamine is decomposed by high temperature, carbon nitride is obtained after drying. Graphene oxide was dissolved in distilled water, sonicated for 30 minutes, and then the pH was adjusted to 9 with NaOH to obtain a graphene oxide solution. Add copper oxide to the graphene oxide solution, sonicate for 2 hours, add carbon nitride to the above-mentioned graphene oxide solution containing metal oxides, make the mass ratio 1:1:0.8, stir for 12 hours, and the final mixture is in the reaction kettle React at 180°C for 12h. After that, it was freeze-dried at -20°C for 24 hours to obtain a carbon nitride heterojunction catalyst. T...

Embodiment 2

[0036] Melamine is placed in a crucible and heated to 550°C in a muffle furnace, and kept at a constant temperature for 4 hours; after cooling to room temperature, it is ultrasonically treated in 0.1M nitric acid solution for 8 hours, finally washed with deionized water until neutral, and dried at 60°C to obtain carbon nitride . Graphene oxide was dissolved into distilled water, sonicated for 30 min, and then the pH was adjusted to 9 with NaOH. Zinc oxide was added to the obtained graphene oxide solution and ultrasonicated for 3 hours. Carbon nitride was added to the graphene oxide solution containing metal oxides so that the mass ratio was 1:1:0.4, stirred for 12 hours, and the final mixture was reacted at 180° C. for 22 hours in a reactor. After that, it was freeze-dried at -20°C for 24 hours to obtain a carbon nitride heterojunction catalyst. The catalyst was then dissolved with a mixture of 5% Nafion solution and 95% ethanol aqueous solution at a volume ratio of 1:5. Ca...

Embodiment 3

[0039] Melamine is placed in a crucible and heated to 550°C in a muffle furnace, and kept at a constant temperature for 4 hours; after cooling to room temperature, it is ultrasonically treated in 0.1M nitric acid solution for 8 hours, finally washed with deionized water until neutral, and dried at 60°C to obtain carbon nitride . Graphene oxide was dissolved into distilled water, sonicated for 30 min, and then the pH was adjusted to 9 with NaOH. Add copper oxide to the obtained graphene oxide solution, and sonicate for 4 hours. Carbon nitride was added to the graphene oxide solution containing metal oxides so that the mass ratio was 1:1:0.2, stirred for 12 hours, and the final mixture was reacted in a reactor at 160° C. for 20 hours. After that, it was freeze-dried at -20°C for 24 hours to obtain a carbon nitride heterojunction catalyst. The catalyst was then dissolved with a mixture of 5% Nafion solution and 95% ethanol aqueous solution with a volume ratio of 1:10. Carbon f...

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Abstract

The invention discloses a carbon nitride heterojunction photocatalyst and application thereof, a heterostructure is formed by using metal oxide and carbon nitride, the separation capacity of electrons and holes is improved, the absorption of visible light is improved, graphene is further doped, the transmission of the electrons and the dispersity of the catalyst are improved, and the photocatalytic effect is better improved. The invention also discloses an application of the carbon nitride heterojunction photocatalytic electrode in reducing carbon dioxide to produce acetic acid in a microbial electrosynthesis system, under the carbon nitride heterojunction photocatalytic electrode, on one hand, photoelectrons and holes are generated, and the holes are used for being combined with electrons transmitted from an anode, therefore, the driving force is obtained to improve the electron obtaining rate of the cathode, the photo-induced electrons can be further transferred to autotrophic microorganisms, and finally, the purpose of improving the acetic acid production efficiency of the bioelectric synthesis system for reducing carbon dioxide is achieved by providing additional electron supply and driving force.

Description

technical field [0001] The invention relates to microbial electrosynthesis technology, in particular to a carbon nitride heterojunction photocatalyst and its preparation method and application. Background technique [0002] Global economic growth and industrialization have brought about rapid growth in energy demand, further increasing the use of energy fuels, and the combustion of these traditional fossil fuels will emit a large amount of carbon dioxide into the atmosphere, which will further lead to climate change and the greenhouse effect. Therefore, reducing carbon emissions and achieving carbon neutrality is an important measure to deal with climate change and realize sustainable human development, and carbon capture, utilization and storage is an important strategic technology to solve the low-carbon development of my country's coal-based energy system One of them is becoming a current research hotspot. [0003] Microbial electrosynthesis (MES) is a bioelectrochemical t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/00C12P7/54
CPCB01J27/24B01J35/004B01J35/0033C12P7/54
Inventor 宋天顺谢婧婧
Owner NANJING UNIV OF TECH
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