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Preparation method of carbon fiber interpenetrating micro heterojunction carbon nitride photocatalyst

A carbon nitride photocatalyst technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of precious metals being very expensive and photocorrosion stability, and achieve the goal of charge carrier High transmission efficiency, high photocatalytic reactivity, and improved electron-hole separation effect

Active Publication Date: 2019-10-15
FUJIAN AGRI & FORESTRY UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to separate more electrons, conductive agents such as Ag, Au and other noble metals must be added, which can generate more photogenerated electrons according to SPR (Surface Plasmon Resonance Principle), but noble metals are very expensive, have photocorrosion and poor stability

Method used

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  • Preparation method of carbon fiber interpenetrating micro heterojunction carbon nitride photocatalyst
  • Preparation method of carbon fiber interpenetrating micro heterojunction carbon nitride photocatalyst
  • Preparation method of carbon fiber interpenetrating micro heterojunction carbon nitride photocatalyst

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preparation example Construction

[0017] refer to Figure 1-3 , the present invention relates to a method for preparing a carbon fiber interpenetrating micro-heterojunction carbon nitride photocatalyst, the method steps are as follows: using melamine and urea as precursors, preparing micro-heterojunction g-C by thermal condensation 3 N 4 , and use oxygen as etching gas, the bulk g-C 3 N 4 Exfoliation was performed to obtain g-C in the form of flakes 3 N 4 ; combine nanocellulose and flake g-C 3 N 4 Mixing, under the protection of argon, heat treatment in a tube furnace to obtain carbon fiber interpenetrating micro-heterojunction carbon nitride photocatalyst.

[0018] Preferably, the method steps are as follows:

[0019] First, melamine and urea were used as precursors to prepare g-C by thermal condensation. 3 N 4 , where the temperature is 500°C, and the time is 60-180min; then it is etched with oxygen, and it is peeled off to obtain flaky g-C 3 N 4 , where the temperature is 400-520°C and the time ...

Embodiment 1

[0023] A preparation method of carbon fiber interpenetrating micro-heterojunction carbon nitride photocatalyst, comprising the following steps:

[0024] 1. Blocky micro-heterostructure g-C 3 N 4 Preparation: Weigh 3.2g of melamine and 0.8g of urea in a crucible, heat up to 500°C at 2°C / min, hold for 2h, heat up to 520°C, hold for 2h, take out and grind.

[0025] 2. Flaky micro-heterostructure g-C 3 N 4 Preparation: Weigh 1g of the block carbon nitride in the above step 1, put it in a muffle furnace, raise the temperature to 520°C at 2°C / min in the presence of oxygen, keep it warm for 4.5h, and mark it as g-C 3 N 4 .

[0026] 3. Preparation of carbon fiber interpenetrating micro-heterojunction carbon nitride photocatalyst: take nanocellulose (CNF) and g-C 3 N 4 (Mass ratio is 0.5:100) Add 10mL of water, ultrasonic for 30min, dry at 60°C for 6h, place in a small porcelain boat, put in a tube furnace, and heat up to 500°C at 5°C / min under argon protection , keep it warm f...

Embodiment 2

[0031] A preparation method of carbon fiber interpenetrating micro-heterojunction carbon nitride photocatalyst, comprising the following steps:

[0032] 1. Blocky micro-heterostructure g-C 3 N 4 Preparation: Weigh 3.2g of melamine and 0.8g of urea in a crucible, heat up to 500°C at 2°C / min, hold for 2h, heat up to 520°C, hold for 2h, take out and grind.

[0033] 2. Flaky micro-heterostructure g-C 3 N 4 Preparation: Weigh 1g of block carbon nitride in step 1, put it in a muffle furnace, raise the temperature to 520°C at 2°C / min in the presence of oxygen, keep it warm for 4.5h, and mark it as g-C 3 N 4 .

[0034] 3. Preparation of carbon fiber interpenetrating micro-heterojunction carbon nitride photocatalyst: take nanocellulose (CNF) and g-C 3 N 4 (Mass ratio is 1:100) Add 10mL of water, ultrasonic for 30min, dry at 60°C for 6h, place in a small porcelain boat, put in a tube furnace, heat up to 500°C at 5°C / min under argon protection , keep it warm for 1h, and then get ...

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Abstract

The invention provides a preparation method of a carbon fiber interpenetrating micro heterojunction carbon nitride photocatalyst, the method comprises the following steps: taking melamine and urea asprecursors, preparing micro heterojunction g-C3N4 by a thermal condensation method, and stripping massive g-C3N4 by using oxygen as an etching gas to obtain flaky g-C3N4; mixing nano cellulose and theflaky g-C3N4, and performing heat treatment in a tube furnace under the protection of argon to obtain the carbon fiber interpenetrating micro heterojunction carbon nitride photocatalyst; putting thecarbon fiber interpenetrating micro heterojunction carbon nitride photocatalyst in a mixed solution of water and ethanol to prepare hydrogen peroxide under visible light irradiation, wherein the content of the hydrogen peroxide is tested by a POD / DPD method. The product prepared by the method has the advantages of good conductivity, large specific surface area, high photocatalytic reaction activity, high charge carrier transmission efficiency and the like, is an environment-friendly photocatalytic material, and can be used for preparing the hydrogen peroxide through photocatalysis under visible light.

Description

【Technical field】 [0001] The invention relates to a preparation method of a carbon nitride-based composite photocatalyst, in particular to a preparation method of a carbon fiber interpenetrating micro-heterojunction carbon nitride photocatalyst. 【Background technique】 [0002] Hydrogen peroxide (H 2 o 2 ) is a clean oxidant, and the final product is mainly water and oxygen, which will not cause secondary pollution, and is an environmentally friendly oxidant. Hydrogen peroxide has important uses in the energy field, fuel vehicle fuel field, chemical raw material field, pulping and bleaching of leather and other fields. Currently mass-produced H 2 o 2 The methods mainly include anthraquinone autoxidation, alcohol oxidation and electrochemical synthesis. However, these methods consume a large amount of energy or organic solvents, and the H extracted by these methods 2 o 2 May be contaminated with organic impurities. Direct synthesis of H by the reaction of hydrogen and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/06B01J35/10B01J37/08C01B15/027
CPCB01J27/24B01J37/082C01B15/027B01J35/58B01J35/39B01J35/61
Inventor 肖禾单艺伟黄六莲陈礼辉吴慧
Owner FUJIAN AGRI & FORESTRY UNIV
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