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Preparation method and uses of MoS2/BiVO4 heterojunction composite photocatalyst

A composite light and catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of poor separation of electron holes, small active specific surface area, electrical The problem of slow carrier migration rate, etc., achieves the effect of large active specific surface area, low cost and convenient operation.

Active Publication Date: 2019-12-13
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heterostructure composite materials mentioned above are beneficial to improve performance and solve the problem of BiVO 4 Poor separation of electron-hole pairs and slow mobility of charge carriers
In existing reports, a novel heterojunction photocatalyst n-Bivo4@p-MoS with core-shell structure was successfully prepared by in situ hydrothermal method 2 , but compared with the 0D / 2D structure, the active specific surface area of ​​the core-shell structure catalyst is small

Method used

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  • Preparation method and uses of MoS2/BiVO4 heterojunction composite photocatalyst
  • Preparation method and uses of MoS2/BiVO4 heterojunction composite photocatalyst
  • Preparation method and uses of MoS2/BiVO4 heterojunction composite photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1)MoS 2 Preparation of nanosheets: 0.1mmol (NH 4 ) 6 Mo 7 o 24 ﹒ 4H 2 O and 3 mmol CH 4 N 2 Dissolve S in 70mL water, stir vigorously for 30min to form a uniform solution; then, transfer the solution to a Teflon-lined stainless steel autoclave for 230°C, 22h constant temperature thermal reaction; , washing the solid product with ethanol, drying, and then grinding the dried product into a fine powder; 80 mg bulk MoS 2 The powder was dispersed in 400mL water and ethanol mixture, the volume ratio of water and ethanol was 3:1; then ultrasonic vibration and stirring treatment was performed for 8h, and then the suspension was placed in an ultrasonic cleaner and treated for another 20min to precipitate aggregated sheets , and then washed and dried to obtain MoS 2 Nanosheets;

[0034] (2)MoS 2 / BiVO 4 Preparation of composite photocatalyst: 0.0940g Bi(NO) 3 ﹒ 5H 2 O and 0.4g of polyvinylpyrrolidone (PVP; MW ~ 40K) were dissolved in 50mL of ethylene glycol in ult...

Embodiment 2

[0037] (1)MoS 2 Preparation of nanosheets: 0.1mmol (NH 4 ) 6 Mo 7 o 24 ﹒ 4H 2 O and 3 mmol CH 4 N 2 Dissolve S in 70mL water and stir vigorously for 30min to form a uniform solution; then, transfer the solution to a Teflon-lined stainless steel autoclave for 220°C, 24h constant temperature thermal reaction; , washing the solid product with ethanol, drying, and then grinding the dried product into a fine powder; 80 mg of MoS 2 The powder was dispersed in 400mL water and ethanol mixture, the volume ratio of water and ethanol was 3:1; then ultrasonic vibration and stirring treatment was performed for 8h, and then the suspension was placed in an ultrasonic cleaner and treated for another 30min to precipitate aggregated sheets , and then washed and dried to obtain MoS 2 Nanosheets;

[0038] (2)MoS 2 / BiVO 4 Preparation of composite photocatalyst: 0.105g Bi(NO) 3 ﹒ 5H 2 O and 0.4 g of polyvinylpyrrolidone (PVP; MW ~ 40K) were dissolved in 50 mL of ethylene glycol in u...

Embodiment 3

[0041] (1)MoS 2 Preparation of nanosheets: 0.1mmol (NH 4 ) 6 Mo 7 o 24 ﹒ 4H 2 O and 3 mmol CH 4 N 2 Dissolve S in 70mL water, stir vigorously for 30min to form a uniform solution; then, transfer the solution to a Teflon-lined stainless steel autoclave for 240°C, 22h constant temperature thermal reaction; , washing the solid product with ethanol, drying, and then grinding the dried product into a fine powder; 80 mg of MoS 2 The powder was dispersed in 400mL water and ethanol mixture, the volume ratio of water and ethanol was 3:1; then ultrasonic vibration and stirring treatment was performed for 10h, and then the suspension was placed in an ultrasonic cleaner and treated for another 30min to precipitate aggregated sheets , and then washed and dried to obtain MoS 2 Nanosheets;

[0042] (2)MoS 2 / BiVO 4 Preparation of composite photocatalyst: 0.102g Bi(NO) 3 ﹒ 5H 2 O and 0.4 g of polyvinylpyrrolidone (PVP; MW ~ 40K) were dissolved in 50 mL of ethylene glycol and ul...

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Abstract

The invention belongs to the technical field of preparation of environmental materials, and relates to a preparation method and uses of a MoS2 / BiVO4 composite photocatalyst synthesized by a hydrothermal method. The preparation method comprises: preparing MoS2 nano-sheets; adding bismuth nitrate and polyvinylpyrrolidone into ethylene glycol, and ultrasonically dispersing and dissolving to obtain amixed solution A; adding NH4VO3 into deionized water, and ultrasonically dispersing and dissolving to obtain a mixed solution B; slowly adding the MoS2 nano-sheets, 3-mercaptopropionic acid and the mixed solution B into the mixed solution A under magnetic stirring, transferring the mixed solution into a high-pressure kettle, and carrying out a constant-temperature reaction; and centrifuging aftercompleting the reaction, washing the obtained precipitate, and drying to obtain a MoS2 / BiVO4 composite photocatalyst. According to the present invention, the method has characteristics of simple and convenient operation, safety and environmental protection; and the morphology of the catalyst shows the characteristics of 0D BiVO4 / 2DMoS2, the active specific surface area of the catalyst is large, and the catalyst is used for degrading harmful substances in environmental wastewater.

Description

technical field [0001] The invention belongs to the technical field of environmental material preparation and relates to the synthesis of MoS by hydrothermal method 2 / BiVO 4 Preparation method and application of composite photocatalyst. Background technique [0002] Antibiotics are anti-pathogenic secondary metabolites produced by bacteria, molds and other microorganisms or higher animals and plants, and are chemical substances that hinder the development of other cells. In today's society with the rapid development of the pharmaceutical industry, antibiotics are widely used in the treatment and defense of human and livestock diseases. But the dangers of overuse of antibiotics cannot be ignored: they cannot be easily biodegraded, and a large amount of waste remains that will flow into the aquatic environment. All kinds of antibiotics in the environment promote the transfer of drug-resistant genes and bacteria to the human body through various channels, which has a seriou...

Claims

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Application Information

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IPC IPC(8): B01J27/051B01J35/08C02F1/30C02F101/38C02F101/34
CPCB01J27/051B01J23/002C02F1/30C02F2101/38C02F2101/34C02F2305/10B01J35/23B01J35/51B01J35/39
Inventor 刘馨琳徐玲艳刘倩朱炫逯子扬于泽惠周国生朱晓蝶李武举
Owner JIANGSU UNIV
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