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Method for preparing hydrogen peroxide by using enol-ketone type covalent organic framework/graphite phase carbon nitride composite photocatalyst

A graphitic carbon nitride, covalent organic framework technology, applied in organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve structural dissociation, poor crystallinity And other issues

Active Publication Date: 2021-05-18
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to poor crystallinity in existing covalent organic framework / carbon nitride composites, the structure is prone to dissociation during the photocatalytic reaction.

Method used

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  • Method for preparing hydrogen peroxide by using enol-ketone type covalent organic framework/graphite phase carbon nitride composite photocatalyst
  • Method for preparing hydrogen peroxide by using enol-ketone type covalent organic framework/graphite phase carbon nitride composite photocatalyst
  • Method for preparing hydrogen peroxide by using enol-ketone type covalent organic framework/graphite phase carbon nitride composite photocatalyst

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Embodiment 1

[0044] A method for preparing hydrogen peroxide by using enol-ketone covalent organic framework / graphite phase carbon nitride composite photocatalyst, comprising the following steps:

[0045] Take enol-ketone covalent organic framework / graphite phase carbon nitride composite photocatalyst (1%TpMa / CN, 5%TpMa / CN, 15%TpMa / CN, 25%TpMa / CN), carbon nitride photocatalyst (CN), each 100mg, and they are respectively added to 100mL, the volume concentration is 10% isopropanol aqueous solution (this isopropanol aqueous solution is the mixed solution of isopropanol and ultrapure water, wherein isopropanol and ultrapure water The volume ratio of water is 1:9), stir magnetically in a dark place (i.e. under dark conditions) for one hour, turn on the light source after reaching adsorption equilibrium, and carry out photocatalytic reaction under visible light (λ≥420nm) for 60min to obtain hydrogen peroxide .

[0046] In this embodiment, the enol-ketone covalent organic framework / graphite phas...

Embodiment 2

[0069] To investigate the reusability of enol-ketone covalent organic framework / graphite carbon nitride composite photocatalyst in the photocatalytic production of hydrogen peroxide, including the following steps:

[0070] (1) Weigh 100 mg of the enol-ketone covalent organic framework / graphite phase carbon nitride composite photocatalyst (5% TpMa / CN) prepared in Example 1, add to 100 mL, 10% volume concentration of isopropyl Alcohol aqueous solution to obtain the reaction system.

[0071] (2) Place the reaction system (isopropanol solution with 5% TpMa / CN added) obtained in step (1) on a magnetic stirrer, and stir for 1 h in the dark to achieve adsorption equilibrium, and take 3 mL of the solution to represent the The initial solution of the reaction, that is, the solution when the reaction time is 0min, after filtration and color development, its concentration is measured with a UV-visible spectrophotometer, and converted into yield.

[0072] (3) The remaining solution of st...

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Abstract

The invention discloses a method for preparing hydrogen peroxide by using an enol-ketone type covalent organic framework / graphite phase carbon nitride composite photocatalyst. The composite photocatalyst and an electron donor solution are mixed to carry out photocatalytic reaction to obtain hydrogen peroxide, wherein the composite photocatalyst comprises an enol-ketone type covalent organic framework and graphite phase carbon nitride, and the enol-ketone type covalent organic framework is loaded on the surface of the graphite phase carbon nitride. According to the invention, the adopted composite photocatalyst has the advantages of multiple reaction active sites, wide light absorption range, low electron-hole pair recombination rate, good photocatalytic performance, good stability, environmental protection and the like, when the composite photocatalyst is used for preparing hydrogen peroxide, the yield within 1 hour can reach 880.494 [mu]mol / L, and still reaches 861.445 [mu]mol / L after five times of circulation, and the composite photocatalyst has the advantages of simple method, high preparation efficiency, high yield and the like, and can be used for large-scale preparation of hydrogen peroxide and facilitates industrial application.

Description

technical field [0001] The invention belongs to the technical field of material preparation and environmental catalysis, and relates to a method for preparing hydrogen peroxide, in particular to a method for preparing hydrogen peroxide by using enol-ketone covalent organic framework / graphite-phase carbon nitride composite photocatalyst method. Background technique [0002] With the development of modern industry, the problems of energy crisis and environmental pollution are becoming more and more serious. Among them, energy shortage and environmental degradation are major problems that human beings face in the 21st century and need to be solved urgently. Therefore, new energy utilization and environmental pollution control are of great significance to the national sustainable development strategy. Due to its low cost, no pollution and high efficiency, photocatalytic technology has broad application prospects in energy storage, conversion and environmental protection. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B15/022C01B15/026C01B15/029B01J27/24B01J31/06
CPCC01B15/022C01B15/026C01B15/029B01J27/24B01J31/069B01J35/39
Inventor 王晗曾光明许飘杨洋周成赟汪文军宗聘黄丹莲杨海澜陈莎
Owner HUNAN UNIV
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