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Carbon nitride composite catalyst with porous structure as well as preparation method and application of carbon nitride composite catalyst

A composite catalyst, porous structure technology, applied in physical/chemical process catalysts, chemical instruments and methods, preparation/separation of ammonia, etc. It can solve the problems of low capacity, and achieve the effect of good photocatalytic nitrogen fixation and ammonia production, reducing the electron-hole recombination rate and accelerating the transfer of electrons.

Pending Publication Date: 2022-05-10
JIANGSU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But g-C 3 N 4 The layered stacking structure leads to its small specific surface area, severe photogenerated electron-hole recombination, and N 2 Disadvantages such as low enrichment capacity
[0004] Journal of Physical Chemistry C, 2016, 120, 19, 10381-10389, reported as NH 4 HCO 3 The introduction of an irregular porous structure into the bubble soft template promotes the separation and transfer of charge carriers and enhances the photocatalytic activity, but it is not convenient to control the formation and number of pores; Chinese Science: Chemistry, 2016,46(08):784-793 , using silica sol as a template to prepare mesoporous carbon nitride, which increases its photocatalytic performance and also increases its ability to enrich methylene blue, but it does not involve the 2 The research on the enrichment ability and photocatalytic nitrogen fixation does not involve the research on the performance of the composite of porous carbon nitride and other photocatalysts.

Method used

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  • Carbon nitride composite catalyst with porous structure as well as preparation method and application of carbon nitride composite catalyst
  • Carbon nitride composite catalyst with porous structure as well as preparation method and application of carbon nitride composite catalyst
  • Carbon nitride composite catalyst with porous structure as well as preparation method and application of carbon nitride composite catalyst

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preparation example Construction

[0037] The invention provides a kind of bulk phase containing irregular porous structure carbon nitride (ipg-C 3 N 4 ) preparation method. Firstly, silica microspheres were prepared by reacting tetraethyl orthosilicate with water; dicyandiamide was used as carbon nitride precursor, the prepared silica microspheres and urea were used as templates, and hydrofluoric acid was used as etchant , prepare ipg-C by calcination and etching 3 N 4 .

[0038] Preparation of irregular porous g-C by a urea-assisted template method 3 N 4 / Bi 2 o 3 The method of composite material, concrete steps are as follows:

[0039] (A) Fully mix water, ammonia water, and ethanol at a volume ratio of 1:0.05-0.2:0.6, and record it as liquid A, preferably 1:0.08:0.6; tetraethyl orthosilicate, ethanol at a volume ratio of 1:5-20 Proportions are fully mixed and recorded as liquid B, wherein the volume ratio of water to tetraethyl orthosilicate is 1:0.1-0.5, preferably 1:0.2. After mixing liquids A a...

Embodiment 1

[0045] Preparation of irregular porous g-C by a urea-assisted template method 3 N 4 / Bi 2 o 3 The method of composite materials, the steps are as follows:

[0046] (1) Fully mix water, ammonia water (25% concentration), and ethanol at a volume ratio of 1:0.05:0.6, and record it as liquid A; fully mix tetraethyl orthosilicate and ethanol at a volume ratio of 1:20, and record It is liquid B, wherein the volume ratio of water to tetraethyl orthosilicate is 1:0.1. A and B liquids were mixed and stirred for 0.5 h, centrifuged and placed in an oven at 60°C to dry, and after grinding, white powdery monodisperse silica microspheres (MNSP-1) were obtained.

[0047] (2) Dicyandiamide, MNSP-1, and urea were dispersed in water at a mass ratio of 1:0.1:2, stirred for 60 minutes, and then dried in an oven at 60°C. After grinding, the white powder was collected for later use.

[0048] (3) Put the obtained powder into a tube furnace protected by nitrogen gas, and heat it at 5°C min -1 R...

Embodiment 2

[0052] Preparation of irregular porous g-C by a urea-assisted template method 3 N 4 / Bi 2 o 3 The method of composite materials, the steps are as follows:

[0053] (1) Fully mix water, ammonia water (28% concentration), and ethanol at a volume ratio of 1:0.07:0.6, and record it as liquid A; fully mix tetraethyl orthosilicate and ethanol at a volume ratio of 1:15, and record It is liquid B, wherein the volume ratio of water to tetraethyl orthosilicate is 1:0.3. A and B liquids were mixed and stirred for 3 hours, centrifuged and placed in an oven at 60°C to dry. After grinding, white powdery monodisperse silica microspheres (MNSP-2) were obtained.

[0054] (2) Disperse dicyandiamide, MNSP-2, and urea in water at a mass ratio of 1:0.5:1.5, stir for 30 minutes to mix evenly, dry in an oven at 60°C, grind, and collect the white powder for later use.

[0055] (3) Put the obtained powder into a tube furnace protected by nitrogen gas, and heat at 2°C·min -1 Raise the temperature...

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Abstract

The invention discloses a porous structure carbon nitride composite catalyst as well as a preparation method and application thereof, and relates to the technical field of photocatalytic material synthesis. Specifically, dicyandiamide is taken as a precursor, silicon dioxide microspheres and urea are taken as templates, hydrofluoric acid is taken as an etching agent, and the carbon nitride composite catalyst with the porous structure is prepared through calcination and etching. The irregular porous carbon nitride composite catalyst with controllable morphology is obtained by combining a hard template method with urea foaming, and the catalyst has good photocatalytic nitrogen fixation ammonia production performance, is simple in operation method, has an important popularization effect on photocatalytic green ammonia synthesis, and has the advantages of energy conservation and environmental protection.

Description

technical field [0001] The invention relates to the technical field of synthesis of photocatalytic materials, in particular to a carbon nitride composite catalyst with a porous structure and its preparation method and application. Background technique [0002] Nitrogen is an essential element for the growth of humans, animals and plants. But nitrogen, which accounts for about 78% of the atmosphere, is inherently inert due to the very stable N≡N, which cannot be directly absorbed by most organisms. Under natural conditions, elemental nitrogen in the atmosphere can only be transformed into combined nitrogen into the biosphere under the action of natural nitrogen fixation such as lightning nitrogen fixation or biological nitrogen fixation. With the development of society, natural nitrogen fixation can no longer meet the needs of human beings, and humans began to carry out artificial nitrogen fixation. At present, the main process of artificial nitrogen fixation, the Haber-Bos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/20B01J35/10C01C1/04
CPCB01J27/20B01J35/61B01J35/60B01J35/39Y02P20/52
Inventor 荣新山张仕贤王明王飞孙婷刘军吴智仁邱旭春
Owner JIANGSU UNIV
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