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Ag2CO3 and Bi4O5I2g-C3N4 composite catalyst as well as synthesis method and application of Ag2CO3 and Bi4O5I2g-C3N4 composite catalyst

A technology of composite catalyst and synthesis method, which is applied in the field of composite catalyst preparation, can solve problems such as difficulty in obtaining, high material price, and secondary pollution, and achieve the effects of improving stability, improving stability, and overcoming defects

Pending Publication Date: 2022-06-07
SHENZHEN INSTITUTE OF INFORMATION TECHNOLOGY
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0005] (1) Traditional treatment methods such as physical (adsorption) and chemical (precipitation, flocculation) methods have very limited degradation efficiency for TC, and by-products may be produced during the treatment process, causing secondary pollution
[0006] (2) The high electron-hole incorporation rate restricts the practical application of visible light-driven semiconductor photocatalysts
[0007] (3) Preparation of a two-step scheme Ag for multi-pollutant degradation under visible light irradiation 2 CO 3 @Bi 4 o 5 I 2 / g -C 3 N 4 There are few reports on heterojunction
[0011] The synthesis steps of many high-efficiency catalysts are complicated, the synthesis conditions are harsh, and the materials are expensive or difficult to obtain, which limits their large-scale production and application.

Method used

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  • Ag2CO3 and Bi4O5I2g-C3N4 composite catalyst as well as synthesis method and application of Ag2CO3 and Bi4O5I2g-C3N4 composite catalyst
  • Ag2CO3 and Bi4O5I2g-C3N4 composite catalyst as well as synthesis method and application of Ag2CO3 and Bi4O5I2g-C3N4 composite catalyst
  • Ag2CO3 and Bi4O5I2g-C3N4 composite catalyst as well as synthesis method and application of Ag2CO3 and Bi4O5I2g-C3N4 composite catalyst

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Experimental program
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Effect test

preparation example Construction

[0047] like figure 1 As shown, the Ag provided by the embodiment of the present invention 2 CO 3 @Bi 4 O 5 I 2 g-C 3 N 4 The synthetic method of composite catalyst comprises the following steps:

[0048] S101, the urea solid is loaded into a ceramic boat, heated in a tube furnace, carbonized under atmospheric atmosphere and naturally cooled to room temperature to obtain pure g-C 3 N 4 ;

[0049] S102, adding bismuth nitrate and potassium iodide into a beaker containing ethylene glycol, and stirring at room temperature; after the solid product is washed twice with ethanol and water, respectively, it is placed in a vacuum drying oven to dry, and the BiOI monomer is collected and obtained;

[0050] S103, put g-C 3 N 4 The monomer and BiOI monomer are heat treated in a muffle furnace to obtain Bi 4 O 5 I 2 / g-C 3 N 4 precursor;

[0051] S104, perform g-C 3 N 4 Preparation of substrate silver carbonate / bismuth oxyiodide nanocomposite catalyst.

Embodiment 1

[0065] A double ladder type g-C 3 N 4 Substrate silver carbonate / bismuth oxyiodide (Ag 2 CO 3 @Bi 4 O 5 I 2 / g-C 3 N 4 ) nanocomposite catalyst, this g-C 3 N 4 Substrate silver carbonate / bismuth oxyiodide stepped nanocomposite photocatalyst based on g-C 3 N 4 basal body, then in g-C 3 N 4 Loading silver carbonate and bismuth oxyiodide on the substrate has the following steps:

[0066] (1), 30g urea solid is loaded into the ceramic boat, put into the tube furnace, heated to 550 ℃ with the speed of 5 ℃ / min, carbonized 5h under atmospheric atmosphere and naturally cooled to room temperature, obtains pure g-C 3 N 4 , named g-C 3 N 4 .

[0067] (2), 6 mmol of bismuth nitrate (Bi(NO 3 ) 3 .5H 20), the potassium iodide (KI) of 6mmol joins in the beaker that 60mL ethylene glycol is housed, stirs 60-70min at room temperature, the solid product is washed twice with ethanol and water respectively, then is placed in the vacuum drying oven 70 ℃ of drying 12h, the BiOI ...

Embodiment 2

[0083] g-C 3 N 4 Substrate silver carbonate / bismuth oxyiodide nanocomposite catalyst (Ag 2 CO 3 @Bi 4 O 5 I 2 / g-C 3 N 4 The photocatalytic performance of ) was evaluated by the catalytic degradation of tetracycline under visible light, including the following processes:

[0084] Weigh the g-C obtained in Example 1 3 N 4Substrate silver carbonate / bismuth oxyiodide nanocomposite catalyst (Ag 2 CO 3 @Bi 4 O 5 I 2 / g-C 3 N 4 ) and g-C 3 N 4 , g-C prepared in Comparative Example 1 3 N 4 Substrate silver carbonate composite (Ag 2 CO 3 @g-C 3 N 4 ), the g-C obtained in Comparative Example 2 3 N 4 Substrate bismuth oxyiodide composite (Bi 4 O 5 I 2 / g-C 3 N 4 ), the silver carbonate (Ag) prepared in the comparative example 3 2 CO 3 ), the bismuth oxyiodide (Bi 4 O 5 I 2 ) 0.02g each, put them into 100mL of 10mg / L tetracycline solution respectively, and stirred for 30min under dark conditions to achieve adsorption and desorption equilibrium, under th...

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Abstract

The invention belongs to the technical field of composite catalyst preparation, and discloses an Ag2CO3 and Bi4O5I2g-C3N4 composite catalyst, a synthesis method and application, urea solid is loaded into a ceramic boat, put into a tubular furnace to be heated, carbonized in the air atmosphere and naturally cooled to the room temperature, and pure g-C3N4 is obtained; adding bismuth nitrate and potassium iodide into a beaker filled with ethylene glycol, and stirring; respectively washing the solid product twice with ethanol and water, drying, and collecting to obtain a BiOI monomer; the preparation method comprises the following steps: carrying out heat treatment on a g-C3N4 monomer and a BiOI monomer in a muffle furnace to obtain a Bi4O5I2 / g-C3N4 precursor; the Bi4O5I2 / g-C3N4 precursor and silver nitrate are mixed and subjected to ultrasonic treatment, a sodium carbonate solution is dropwise added, and the g-C3N4 substrate silver carbonate / bismuth oxyiodide nano composite catalyst is prepared. The method has the advantages of simple process, easiness in operation, low cost, no pollution and the like.

Description

technical field [0001] The invention belongs to the technical field of composite catalyst preparation, in particular to a kind of Ag 2 CO 3 @Bi 4 O 5 I 2 g-C 3 N 4 Composite catalyst, synthesis method and application. Background technique [0002] Currently, antibiotics are widely used in human medicine, veterinary medicine and aquaculture as important drugs for the treatment of pathogenic bacterial infections. However, due to their overuse, they accumulate in the aquatic environment and pose a potential threat to human health. Therefore, the removal of antibiotics from the water environment has become a top priority. As a broad-spectrum antibiotic (BSA), tetracycline (TC) is widely used in the prevention and treatment of bacterial infections due to its broad-spectrum antimicrobial activity. However, TC contaminants can often be detected in aquatic environments due to overuse and poor biodegradability. Studies have shown that even if the concentration of TC in aqueo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/30C02F101/30
CPCB01J27/24C02F1/30C02F2101/30C02F2305/10B01J35/39Y02W10/37
Inventor 吕笑笑陈子骏牛承岗
Owner SHENZHEN INSTITUTE OF INFORMATION TECHNOLOGY
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