Preparation method of all-organic composite photocatalytic material for photocatalytic production of hydrogen peroxide

A composite photocatalysis, hydrogen oxide technology, applied in the directions of peroxide/peroxyhydrate/peroxyacid/superoxide/ozone, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of low absorption efficiency , low charge conductivity, etc., to achieve the effect of reducing the recombination rate, simplifying the process flow, and improving the ability

Pending Publication Date: 2022-06-28
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some inherent disadvantages of single organic photocatalysts, such as low visible light absorption efficiency (below 460nm), e - / h + The factors such as fast recombination speed and low charge conductivity make it limited in the process of photocatalytic hydrogen peroxide generation. Therefore, how to effectively overcome the above problems and obtain a wide light absorption range, e - / h + For the modified graphite phase carbon nitride photocatalyst with low recombination rate and good photocatalytic performance and the matching modified graphite phase carbon nitride with simple process, wide source of raw materials, low cost, high preparation efficiency and high yield The preparation method of photocatalyst is of great significance for improving the photocatalytic production of hydrogen peroxide by organic photocatalyst

Method used

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  • Preparation method of all-organic composite photocatalytic material for photocatalytic production of hydrogen peroxide
  • Preparation method of all-organic composite photocatalytic material for photocatalytic production of hydrogen peroxide
  • Preparation method of all-organic composite photocatalytic material for photocatalytic production of hydrogen peroxide

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Experimental program
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Effect test

Embodiment 1

[0038] Weigh 25g of melamine, put it in a crucible with a lid, place it in a muffle furnace at a rate of 5°C / min, heat it up to 550°C, keep it at a constant temperature for 3 hours, and after natural cooling, take it out and grind it to obtain a pale yellow powder g-C 3 N 4 ; Weigh 5g of pale yellow powder and 0.01g of 1,6,7,12,-tetrachloro-3,5,9,10-perylene tetracarboxylic dianhydride, grind the two, and put them into a porcelain boat after mixing evenly. In a tube furnace, in an argon atmosphere, the temperature was raised to 200 °C at a heating rate of 5 °C / min for 2 hours, and then taken out after natural cooling; then repeatedly washed with methanol and deionized water, vacuum dried and ground to obtain Brown powdery PI Cl EN.

Embodiment 2

[0040] Weigh 25g of melamine, put it into a crucible with a lid, place it in a muffle furnace at a rate of 5°C / min, heat it up to 550°C, keep it at a constant temperature for 3h, after natural cooling, take out and grind to obtain a pale yellow powder g-C 3 N 4 ; Weigh 5g of light yellow powder and 0.01g of 1,6,7,12,-tetrachloro-3,5,9,10-perylene tetracarboxylic dianhydride, grind the two, and put them into a porcelain boat after mixing evenly. In an argon atmosphere, the temperature was raised to 300°C at a heating rate of 5°C / min for 2 hours, and then taken out after natural cooling; then repeatedly washed with methanol and deionized water, vacuum dried and ground to obtain a brown color Powdered PI Cl EN.

Embodiment 3

[0042] Weigh 25g of melamine, put it into a crucible with a lid, place it in a muffle furnace at a rate of 5°C / min, heat it up to 550°C, keep it at a constant temperature for 3h, after natural cooling, take out and grind to obtain a pale yellow powder g-C 3 N 4; Weigh 5g of pale yellow powder and 0.01g of 1,6,7,12,-tetrachloro-3,5,9,10-perylenetetracarboxylic dianhydride (PA Cl ), grind the two, mix them evenly and put them into a porcelain boat. As for the tube furnace, in an argon atmosphere, the temperature is raised to 400°C at a heating rate of 5°C / min for 2 hours, and then taken out after natural cooling; then Repeated washing with methanol and deionized water, vacuum drying and grinding to obtain PA through amidation reaction. Cl grafted on g-C 3 N 4 composite photocatalyst on PI Cl CN, due to the substitution of chlorine atoms at the PA bay site, the catalyst inhibits the π-π aggregation between perylene diimide molecules, which in turn affects the interfacial elec...

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Abstract

The invention discloses a preparation method of an all-organic composite photocatalytic material for photocatalytic production of hydrogen peroxide, and the preparation method specifically comprises the following steps: firstly, calcining a nitrogen-containing precursor in a muffle furnace, and grinding to obtain g-C3N4; the preparation method comprises the following steps: uniformly mixing g-C3N4 with 1, 6, 7, 12,-tetrachloro-3, 5, 9, 10-perylenetetracarboxylic dianhydride, calcining and grinding in an inert gas atmosphere, cleaning the obtained sample with methanol and deionized water until the supernatant is colorless, centrifuging, drying and grinding. According to the all-organic composite photocatalytic material prepared by the invention, an all-organic heterojunction is formed between 1, 6, 7, 12,-tetrachloro-3, 5, 9, 10-perylene tetracarboxylic diimine and g-C3N4, and chlorine atoms are substituted at the bay position of perylene tetracarboxylic diimine, so that electron migration in carbon nitride is promoted, separation of current carriers is facilitated, the recombination rate of electron-hole pairs is reduced, and the photocatalytic efficiency is improved. The photocatalytic hydrogen peroxide production capability is improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of organic photocatalytic materials, and in particular relates to a preparation method of an all-organic composite photocatalytic material for photocatalytic production of hydrogen peroxide. Background technique [0002] As an environmentally friendly green chemical, the market demand for hydrogen peroxide is increasing year by year, and it is widely used in environmental protection, petrochemical, electronics, food and other industries. At present, hydrogen peroxide is industrially produced by anthraquinone method, but the raw materials, products and production processes all have high risks, high energy consumption and serious pollution. It is imperative to develop a new energy-saving and environmentally friendly hydrogen peroxide production process. Therefore, photocatalysts utilize water and oxygen to produce hydrogen peroxide under solar energy, which are considered to be clean, sustainabl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J31/02B01J35/00C01B15/027
CPCB01J27/24B01J31/0247B01J31/0271B01J35/004C01B15/027
Inventor 董国辉董婷婷
Owner SHAANXI UNIV OF SCI & TECH
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