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Method for degrading sulfadimethoxine under catalysis of chloroperoxidase

A technology of sulfadimethoxine and chloroperoxidase, applied in chemical instruments and methods, oxidized water/sewage treatment, water pollutants, etc., can solve problems such as secondary pollution, high equipment requirements, and non-targeting , to achieve the effect of mild reaction conditions, short degradation time and simple operation

Inactive Publication Date: 2014-10-08
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the whole cell method takes a long time (> 12 hours) to degrade, is not targeted, and can hardly remove the sulfadimethoxine pollution; the ultrafiltration method is low in efficiency (1 hour) during UV photocatalytic degradation; O 3 When oxidative degradation, sulfadimethoxine and O 3 The concentration ratio of O is 1:8.5, and O 3 It needs to be generated online, and the equipment requirements are high; ClO 2 When oxidative degradation, the amount of oxidant and catalyst is large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Add 90 μL of 1 μmol / L chloroperoxidase solution (prepared from 0.1 mol / L phosphate buffer solution and chloroperoxidase) to 30 mL of 64 μmol / L sulfadimethoxine aqueous solution, mix well, and add 0.1 mol / L of phosphate buffer solution to adjust the pH of the mixture to 3, and then add 3 μL of 30% H 2 o 2 Aqueous solution, in which sulfadimethoxine and chloroperoxidase, H 2 o 2 The molar ratio is 1:4.69×10 -5 : 15.6, stirred at room temperature for 15 minutes. Measure the concentration of sulfadimethoxine before and after degradation with high performance liquid chromatography, and calculate the degradation rate of sulfadimethoxine according to the following formula:

[0011] η=(C 0 -C t ) / C 0 ×100%

[0012] Where η is the degradation rate, C 0 is the initial concentration of sulfadimethoxine, C t is the concentration of sulfadimethoxine at time t. After calculation, the degradation rate of sulfadimethoxine is 95%.

Embodiment 2

[0014] In this example, 0.1 mol / L phosphate buffer solution was used to adjust the pH of the mixed solution to 2. The other steps were the same as in Example 1. After calculation, the degradation rate of sulfadimethoxine was 56%.

Embodiment 3

[0016] In this example, 0.1 mol / L phosphate buffer solution was used to adjust the pH of the mixed solution to 2.5. The other steps were the same as in Example 1. After calculation, the degradation rate of sulfadimethoxine was 82%.

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PUM

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Abstract

The invention discloses a method for degrading sulfadimethoxine under catalysis of chloroperoxidase. The method is based on a bio-enzyme catalytic degradation system and comprises the steps of adding chloroperoxidase to a to-be-degraded sulfadimethoxine solution; mixing uniformly; adjusting a pH value of the mixed solution to 2-4.5 by using a phosphate buffer solution; then adding a H2O2 aqueous solution into the mixed solution with H2O2 as an oxidant; and stirring at a room temperature to degrade sulfadimethoxine. The method is simple in operations, small in use amount of chloroperoxidase and H2O2 and mild in reaction conditions, can break the molecular structure of sulfadimethoxine rapidly into small molecules, reduces pollutions to an environment, and is short in degradation time. A degradation rate of sulfadimethoxine within 10-20 minutes can reach 80%-96%.

Description

technical field [0001] The invention belongs to the technical field of water, waste water or sewage treatment, and in particular relates to a method for rapidly degrading sulfadimethoxine by using an enzyme-catalyzed oxidation method. Background technique [0002] Sulfadimethoxine is a common antibacterial agent, because of its obvious anti-infection, high efficiency, and stable properties, it is widely used in food animals as preventive and therapeutic drugs. However, sulfadimethoxine is poorly absorbed, and 30% to 90% of it is excreted in urine or feces. At present, sulfadimethoxine has been detected in urban sewage, river water, groundwater, soil, river and lake sediments and other environmental media in many countries. After entering the environment, it will stimulate pathogenic bacteria to develop drug resistance, and enter the human body through the food chain, destroying the human hematopoietic system, causing hemolytic anemia, and affecting human health. Sulfametha...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F1/58C02F101/38
Inventor 蒋育澄李晓红胡满成李淑妮翟全国
Owner SHAANXI NORMAL UNIV