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Preparation method and application of g-C3N4-@CeO2 composite catalyst

A composite catalyst, g-c3n4 technology, applied in physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., can solve problems such as increased cost, inability to be put into practical application on a large scale, and long aging

Active Publication Date: 2021-01-26
JIANGHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adsorb formaldehyde through physical and chemical methods to purify formaldehyde in indoor air. On the one hand, it is necessary to provide a large amount of adsorbents (the adsorbents need to be replaced regularly). On the other hand, physical and chemical methods are time-consuming and cannot be put into practical application on a large scale.
Purifying formaldehyde in indoor air through biological means (such as green plant absorption) not only requires a large number of plants with good absorption of formaldehyde to purify the air, but also requires a relatively long time for biological means to purify indoor air. Therefore, the purpose of purifying formaldehyde in indoor air by biological means cannot be effectively realized at present.
To achieve the purpose of purifying indoor air by thermally catalytically decomposing formaldehyde, it not only requires additional special equipment, but also consumes a lot of energy, which greatly increases the cost while efficiently removing formaldehyde

Method used

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  • Preparation method and application of g-C3N4-@CeO2 composite catalyst
  • Preparation method and application of g-C3N4-@CeO2 composite catalyst
  • Preparation method and application of g-C3N4-@CeO2 composite catalyst

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preparation example Construction

[0042] The main idea of ​​the embodiment of the present invention is: a g-C 3 N 4 @CeO 2 The preparation method of composite catalyst comprises the steps:

[0043] The graphitic carbon nitride (g-C 3 N 4 ) The monomer material is dispersed in deionized water, and the dispersion I is obtained after ultrasonic treatment;

[0044] Ceria (CeO 2 ) The monomer material is dispersed in deionized water, and the dispersion II is obtained after ultrasonic treatment:

[0045] Add the dispersion I to the dispersion II dropwise under stirring to obtain a mixed dispersion;

[0046] The resulting mixed dispersion is continuously stirred to obtain a dispersed solution of the reaction product;

[0047] The reaction product is centrifuged and dried to obtain g-C containing 3 N 4 The composite catalyst whose mass proportion is 5-35wt%.

[0048] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the examples of the present invention can be pur...

Embodiment 1

[0050] With 50.0g of melamine (C 2 h 4 N 4 ) into a clean beaker, then place the beaker in an electric blast drying oven and dry at 60°C for 24 hours, seal the dried beaker filled with melamine with plastic wrap, and then place it in a desiccator. Weigh 8.0g of dry melamine and pour it into a clean porcelain crucible, cover it, then place the porcelain crucible in a muffle furnace, adjust the temperature to 580°C under programmed temperature rise, and then keep it at 580°C for 4h, the program The heating rate was 2°C / min. After the calcination was finished and the porcelain crucible was naturally cooled to room temperature, the porcelain crucible was taken out, the calcined product was fully ground and then transferred into a sample tube and labeled to obtain graphite phase carbon nitride (g-C 3 N 4 ) monomer catalyst material. for use in the following examples.

Embodiment 2

[0052] Accurately weigh 4.3422g cerium nitrate hexahydrate with an analytical balance, pour the weighed cerium nitrate hexahydrate into a clean porcelain crucible and cover it, then put the crucible into a muffle furnace and calcinate at a temperature of 500°C 240min, the temperature program rate is 2°C / min, after the crucible is naturally cooled to room temperature, take out the porcelain crucible, take out the calcined product, and obtain a light yellow powder after sufficient grinding, and finally obtain nano-ceria (CeO 2 )Material. for use in the following examples.

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Abstract

The invention provides a preparation method and application of a g-C3N4-@CeO2 composite catalyst, and the preparation method comprises the following steps: dispersing a graphite-phase carbon nitride monomer material in deionized water, and carrying out ultrasonic treatment to obtain a dispersion liquid I; dispersing a cerium dioxide monomer material in deionized water, and carrying out ultrasonictreatment to obtain a dispersion liquid II: dropwise adding the dispersion liquid I into the dispersion liquid II while stirring to obtain a mixed dispersion liquid; continuously stirring the obtainedmixed dispersion liquid to obtain a dispersion solution of a reaction product; and centrifuging and drying the reaction product to obtain the composite catalyst containing 5-35wt% of g-C3N4 by mass.The g-C3N4 / CeO2 composite catalyst material obtained by the invention has high room-temperature visible light irradiation activity and has an efficient catalytic degradation effect on formaldehyde, sothat the purpose of removing formaldehyde is achieved.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite materials, in particular to a g-C 3 N 4 @CeO 2 Preparation method and application of composite catalyst. Background technique [0002] At present, there are many methods and ways to control and purify indoor air, especially to remove formaldehyde in indoor air. The more mature methods are: adsorption (including physical adsorption and chemical adsorption) method, green plant absorption and purification method, thermal catalysis decomposition and photocatalytic oxidation degradation. Adsorb formaldehyde through physical and chemical methods to purify formaldehyde in indoor air. On the one hand, it is necessary to provide a large amount of adsorbents (the adsorbents need to be replaced regularly). On the other hand, physical and chemical methods are time-consuming and cannot be put into practical application on a large scale. . Purifying formaldehyde in indoor air through biological means...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01D53/86B01D53/72
CPCB01J27/24B01D53/8668B01J35/39Y02A50/20
Inventor 徐志花黄刚严朝雄
Owner JIANGHAN UNIVERSITY
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