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Method for degrading antibiotics in water by activating peracetic acid through zero-valent metal

A zero-valent metal, peracetic acid technology, applied in chemical instruments and methods, oxidized water/sewage treatment, water pollutants, etc., can solve problems such as secondary pollution, and achieve low by-products, environment-friendly, and low cost. Effect

Active Publication Date: 2021-04-30
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are shortcomings such as secondary pollution in the conventional metal-catalyzed homogeneous advanced oxidation system.

Method used

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  • Method for degrading antibiotics in water by activating peracetic acid through zero-valent metal
  • Method for degrading antibiotics in water by activating peracetic acid through zero-valent metal
  • Method for degrading antibiotics in water by activating peracetic acid through zero-valent metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Prepare 200 mL of tetracycline solution with an initial concentration of 10 μM in a beaker;

[0028] (2) Add a certain amount of peracetic acid to make the concentration 50 μM;

[0029] (3) Under room temperature conditions, open the magnetic stirring device of reaction vessel and start to stir;

[0030] (4) Add a certain amount of nanometer zero-valent iron to make its concentration 0.06g / L;

[0031] (5) adding glacial acetic acid and sodium hydroxide to adjust the pH value to be 3.5, 4.5, 5.5, 6.5, 7.5 respectively;

[0032] (6) Sampling at specific time intervals, testing the residual concentration of tetracycline in the sample, and drawing a histogram of the degradation efficiency of tetracycline under the conditions of different solution pH values.

[0033] Such as figure 1 As shown, the ordinate represents the removal efficiency of tetracycline, and the degradation efficiency of tetracycline can be realized at a pH value of 3.5-7.5, and the degradation effi...

Embodiment 2

[0035] (1) Prepare 200 mL of tetracycline solution with an initial concentration of 10 μM in a beaker;

[0036] (2) Add a certain amount of peracetic acid to make the concentration 50 μM;

[0037] (3) Under room temperature conditions, open the magnetic stirring device of reaction vessel and start to stir;

[0038] (4) Add a certain amount of nanometer zero-valent iron to make the concentration 0.02-0.1g / L;

[0039] (5) adding glacial acetic acid and sodium hydroxide to adjust the pH value to 6;

[0040] (6) Sampling at a specific time interval, testing the remaining concentration of tetracycline in the sample, and drawing a histogram of the degradation efficiency of tetracycline under the condition of different nanometer zero-valent iron dosage.

[0041] Such as figure 2 As shown, the abscissa represents the concentration of nanometer zero-valent iron, and the ordinate represents the degradation efficiency of tetracycline. The degradation efficiency of tetracycline gradu...

Embodiment 3

[0043] (1) Prepare 200 mL of tetracycline solution with an initial concentration of 10 μM in a beaker;

[0044] (2) Add a certain amount of peracetic acid to make the concentration 10-100 μM;

[0045] (3) Under room temperature conditions, open the magnetic stirring device of reaction vessel and start to stir;

[0046] (4) Add a certain amount of nanometer zero-valent iron to make its concentration 0.06g / L;

[0047] (5) adding glacial acetic acid and sodium hydroxide to adjust the pH value to be 6 respectively;

[0048] (6) Sampling in specific time intervals, test the residual concentration of tetracycline in the sample, and draw the histogram of the degradation efficiency of tetracycline under different peracetic acid concentration conditions.

[0049] Such as image 3 As shown, the abscissa represents the concentration of peracetic acid, and the ordinate represents the degradation efficiency of tetracycline. With the increase of peracetic acid concentration, the degrada...

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Abstract

The invention discloses a method for degrading antibiotics in water by activating peracetic acid through zero-valent metal. According to the method, peracetic acid which is high in oxidation-reduction potential, widely applied to the disinfection field and few in by-products is selected as a precursor for generating hydroxyl radicals, and the peracetic acid is activated by the zero-valent metal to generate strong oxidizing free radicals so as to degrade antibiotics in the water body. The method comprises the following specific steps: adding a proper amount of a strong oxidant, namely the peroxyacetic acid into a to-be-treated water body containing antibiotics, then adding the zero-valent metal with a concentration of 0.02 g / L-0.1 g / L as an activating agent, adjusting the pH value of a reaction solution to 3-9, and carrying out uniform stirring and reacting at room temperature for 30 minutes so as to oxidize and degrade the antibiotics. The zero-valent metal used in the method has the advantages of being low in cost, high in activation efficiency, easy to recycle and the like, the peracetic acid can be completely activated within 30 min, and high antibiotic degradation efficiency is achieved, so the method is a novel antibiotic degradation technology which is rapid, efficient and environmentally friendly.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a method for degrading antibiotics in water. Background technique [0002] Antibiotics are widely used around the world, but most of them are not properly disposed of when they are used by humans, resulting in their release into the water environment and becoming an emerging pollutant. Antibiotics currently remaining in the aquatic environment are affecting the ecological environment in various ways. Due to its strong drug persistence, bioaccumulation and biorefractory characteristics, it is necessary to study and realize the rapid oxidative degradation of antibiotics. [0003] In recent years, advanced oxidation technology based on highly active free radicals has been more and more widely used in water treatment processes. The advanced oxidation method oxidizes and decomposes organic pollutants into small molecular substances through the hydroxyl radicals or sulfuric acid radica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F101/34C02F101/38
CPCC02F1/722C02F1/725C02F2101/34C02F2101/38Y02W10/37
Inventor 赵晓丹荆国华周作明张鹏宇
Owner HUAQIAO UNIVERSITY
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