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Molybdenum disulfide nanosheet, preparation method and application thereof and method for degrading halogenated antibiotics through electrochemical reduction

A technology of molybdenum disulfide and nanosheets, applied in the fields of molybdenum sulfide, chemical instruments and methods, nanotechnology, etc., can solve the problems of restricting wide application, high cost and scarcity of noble metal catalysts, and achieve the effect of wide application prospects

Inactive Publication Date: 2021-04-20
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The degradation efficiency of electrochemical reduction mainly depends on the choice of cathode catalyst. Noble metals represented by palladium are considered to be ideal electrochemical dechlorination catalysts because they can catalyze the formation of surface adatomic hydrogen (H*) with strong reducing ability, but noble metals The high cost and scarcity of the catalyst limit its wide application in the field of water treatment to degrade pollutants

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  • Molybdenum disulfide nanosheet, preparation method and application thereof and method for degrading halogenated antibiotics through electrochemical reduction
  • Molybdenum disulfide nanosheet, preparation method and application thereof and method for degrading halogenated antibiotics through electrochemical reduction
  • Molybdenum disulfide nanosheet, preparation method and application thereof and method for degrading halogenated antibiotics through electrochemical reduction

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preparation example Construction

[0039] The invention provides a preparation method of molybdenum disulfide nanosheets, comprising the following steps:

[0040] a) mixing ammonium molybdate tetrahydrate, thiourea and water to obtain a mixed solution;

[0041] b) heating and reacting the mixed solution to form molybdenum disulfide nanosheets.

[0042] Regarding step a):

[0043] The present invention uses specific ammonium molybdate tetrahydrate and thiourea as reaction raw materials to synthesize molybdenum disulfide nanosheets, which can not only synthesize molybdenum disulfide, but also obtain molybdenum disulfide nanosheets with suitable size, and the distribution of catalytic active sites makes the catalytic effect reach The best, can effectively degrade halogenated antibiotics. If other raw materials are used, such as sodium molybdate as molybdenum source and cysteine ​​as sulfur source, the degradation effect of the obtained molybdenum disulfide is very poor.

[0044] In the present invention, the mol...

Embodiment 1

[0075] 2 mmol of ammonium molybdate tetrahydrate and 28 mmol of thiourea were dispersed in 70 mL of deionized water, and ultrasonically stirred for 30 minutes to form a homogeneous solution. After that, the solution was transferred to a 100 mL autoclave and heated to 220 °C for 18 h. After cooling to room temperature, the black suspension was repeatedly filtered and washed with ethanol and water, and dried in a drying cabinet at 80°C overnight. Finally, black molybdenum disulfide catalyst powder is obtained.

[0076] figure 1 It is the X-ray crystal diffraction pattern of the molybdenum disulfide catalyst obtained in Example 1, which proves that the obtained product is MoS 2 . figure 2 Be the scanning electron microscope image of the molybdenum disulfide catalyst obtained in Example 1, image 3 It is a transmission electron microscope image of the molybdenum disulfide catalyst obtained in Example 1, and it can be seen that the obtained molybdenum disulfide has a nano-flak...

Embodiment 2

[0077] Example 2 Catalytic degradation of florfenicol solution

[0078] S1. 10 mg of the molybdenum disulfide catalyst obtained in Example 1 was dissolved in a mixed solution containing 50 μL of Nafion solution, 450 μL of water and 500 μL of ethanol, and ultrasonically treated for 1 hour to form a homogeneous solution. Then, drop-coat the above catalyst solution to 1x3cm 2 On the carbon paper of the same size, it was dried at room temperature overnight to obtain a working electrode, which was used for later use.

[0079] S2. Use an H-type electrolytic cell as the reactor, and divide the reactor into a cathode compartment and an anode compartment with a proton exchange membrane. The volume of the electrolyte sewage is 80 mL, and the catholyte contains 0.1M Na 2 SO 4 Electrolyte solution and 20mg / L florfenicol solution, anolyte containing only 0.1M Na 2 SO 4 a. And magnetically stir the cathode chamber at a constant rate.

[0080] S3. Use a three-electrode system for elect...

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Abstract

The invention provides a molybdenum disulfide nanosheet, a preparation method and application thereof and a method for degrading halogenated antibiotics through electrochemical reduction. The synthesized thin-layer molybdenum disulfide nanosheet serves as a cathode catalyst in electrochemical reduction, halogenated antibiotics difficult to degrade in the water environment can be efficiently removed, accumulation of the antibiotics in the water environment is remarkably degraded, an economical and efficient application method is provided for effectively blocking drug-resistant gene transfer, and the application prospect is wide. Experimental results show that the synthesized thin-layer molybdenum disulfide nanosheet is used as a cathode material in electrochemical reduction, and halogenated antibiotics in sewage can be effectively degraded within 4 hours.

Description

technical field [0001] The invention relates to the field of water pollution control, in particular to a molybdenum disulfide nanosheet and a preparation method and application thereof, and a method for electrochemical reduction and degradation of halogenated antibiotics. Background technique [0002] The overuse of antibiotics has caused serious threats to the aquatic environment and human health. In particular, halogenated antibiotics account for nearly 40% of the total amount of antibiotics used in my country. Among them, chlorinated antibiotics, including florfenicol and chloramphenicol, are broad-spectrum antibiotics that are widely used in veterinary medicine to treat various infections. , which is prone to continuous accumulation in aquatic and sedimentary environments, has aroused public concern and concern due to its environmental persistence and severe biological toxicity. However, it is difficult to effectively remove these special refractory pollutants through tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/051B01J35/00B01J35/02B82Y40/00C01G39/06C02F1/467C02F101/34C02F101/36C02F101/38
Inventor 江鸿杨靖
Owner UNIV OF SCI & TECH OF CHINA
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