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Preparation of ZIF-67 catalyst and application thereof to degradation of antibiotics such as tetracycline

A technology of ZIF-67 and catalyst, which is applied in the field of pollutant degradation in wastewater and soil, can solve the problems of Fenton oxidation limitation and incomplete degradation, and achieve good catalytic degradation effect, no pollution, and simple operation

Active Publication Date: 2020-05-29
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the Fenton oxidation method is a relatively effective and common method, but due to its incomplete degradation and the need for strong acid conditions, the Fenton oxidation method has been greatly restricted in sewage treatment.

Method used

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  • Preparation of ZIF-67 catalyst and application thereof to degradation of antibiotics such as tetracycline
  • Preparation of ZIF-67 catalyst and application thereof to degradation of antibiotics such as tetracycline
  • Preparation of ZIF-67 catalyst and application thereof to degradation of antibiotics such as tetracycline

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add Co(NO 3 ) 2 ·6H 2 O (291 mg) was dissolved in 15 mL of methanol, 2-methylimidazole (328 mg) was dissolved in 15 mL of methanol, and then the 2-methylimidazole solution was slowly dropped into Co(NO 3 ) 2 In the solution, after stirring and reacting for 6 hours at room temperature, it was left to age for 24 hours. Then it was centrifuged and washed several times with methanol, and dried at 70°C for 12 hours to obtain a purple powdery solid.

[0033] figure 1 For the XRD comparison figure of the ZIF-67 prepared in Example 1 and the simulated ZIF-67, it can be seen from the comparison figure that the technical scheme of the present invention has synthesized ZIF-67, wherein ZIF-67 and the simulated ZIF-67 are fit.

Embodiment 2

[0035] Utilize ZIF-67 prepared by the present invention to catalyze H 2 o 2 Application to generate hydroxyl radicals.

[0036] The ZIF-67 catalyst catalyzes H 2 o 2 The steps of generating hydroxyl radicals to degrade tetracycline are as follows:

[0037] Step 1: Tetracycline solution (2.25×10 -4 mol / L, 100mg / L) to take 20mL into a 50mL round bottom flask, add catalyst (0.2g / L) and stir for 10min.

[0038] Step 2: Test and record the peak absorption of the tetracycline solution at this time.

[0039] Step 3: Quickly join H 2 o 2 (4.5×10 -3 mol / L, 20eq), measure the peak shape of the UV-Vis absorption spectrum of organic pollutants with a UV-Vis photometer.

[0040] The mass of the ZIF-67 catalyst in the reaction system in step 1 was 4 mg.

[0041] figure 2 For the ZIF-67 catalytic H prepared by Example 2 of the present invention 2 o 2Hydroxyl free radicals are produced to degrade the UV-visible light absorption spectrum of tetracycline under optimal conditions. ...

Embodiment 3

[0043] Utilize ZIF-67 prepared by the present invention to catalyze H 2 o 2 Application to generate hydroxyl radicals.

[0044] The ZIF-67 catalyst catalyzes H 2 o 2 The steps of producing hydroxyl radicals to degrade oxytetracycline are as follows:

[0045] Step 1: Oxytetracycline solution (1.125×10 -4 mol / L, 50mg / L) to take 20mL into a 50mL round bottom flask, add catalyst (0.2g / L) and stir for 10min.

[0046] Step 2: Test and record the absorption peak of the oxytetracycline solution at this time.

[0047] Step 3: Quickly join H 2 o 2 (2.25×10 -3 mol / L, 20eq), measure the peak shape of the UV-Vis absorption spectrum of organic pollutants with a UV-Vis photometer.

[0048] The mass of the ZIF-67 catalyst in the reaction system in step 1 was 4 mg.

[0049] image 3 For the ZIF-67 catalytic H prepared by Example 3 of the present invention 2 o 2 Produce hydroxyl radicals to degrade oxytetracycline's UV-visible absorption spectrum under optimal conditions. The catal...

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Abstract

The invention discloses preparation of a ZIF-67 catalyst and application thereof to degradation of antibiotics such as tetracycline. The invention discloses preparation and application of a metal organic framework film for catalytically degrading antibiotics such as tetracycline. The preparation method comprises the following steps: dissolving Co(NO3)2.6H2O in methanol to prepare a Co(NO3)2 solution; dissolving 42-methylimidazole in methanol to prepare a 2-methylimidazole solution; dropwise adding a 2-methylimidazole solution into the Co(NO3)2 solution, performing stirring and standing for aging, centrifugally absorbing supernatant, and performing drying to obtain purple solid powder, wherein the prepared catalyst is difficult to degrade antibiotics, and tetracycline is effectively degraded by hydroxyl radicals generated under the oxidation condition of hydrogen peroxide. The hydroxyl free radicals have strong oxidizing property and can oxidize and degrade tetracycline. Compared with the prior art, the ZIF-67 catalyst prepared by the invention has the advantages of low metal dissolution, good reusability, simple and convenient operation process, wide pH application range and the like when being used for activating hydrogen peroxide, and has a wide application prospect in the field of degradation-resistant antibiotic treatment.

Description

technical field [0001] The invention relates to the preparation of a ZIF-67 catalyst and its application in degrading antibiotics such as tetracycline, and belongs to the technical field of pollutant degradation in waste water and soil. Background technique [0002] Zeolite-type imidazolate metal-organic frameworks (ZIFs) are a new class of metal-organic frameworks with excellent chemical and thermal stability, and have a wide range of applications in many fields, such as catalyzing organic synthesis reactions, adsorption, and photocatalytic degradation. , supercapacitors, etc. There are many methods for the preparation of zeolitic imidazolate metal-organic frameworks (ZIFs), among which the most commonly used method is the solvothermal method. That is, the metal salt and the imidazole ligand are dissolved in an organic liquid, such as methanol methanol, N,N-dimethylformamide (DMF), or N,N-diethylformamide (DEF), and then heated at high temperature (> 100 ° C) under hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G83/00B01J31/22C02F1/72A62D3/38C02F101/34C02F101/38A62D101/28A62D101/26
CPCC08G83/008B01J31/1691B01J31/1815C02F1/722C02F1/725A62D3/38B01J2531/845C02F2101/34C02F2101/38A62D2101/28A62D2101/26
Inventor 刘湘侯文欣黄煜
Owner CHINA THREE GORGES UNIV
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