Method for catalyzing degradation of sulfadimethoxine by chloroperoxidase

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, wastewater or sewage treatment, and specifically relates to a method for realizing rapid degradation of sulfadimethoxine by using an enzyme-catalyzed oxidation method. Background technique [0002] Sulfamethoxine is a common antibacterial agent. Because of its obvious anti-infection, high efficiency, and stable properties, it is widely used in food animals as a preventive and therapeutic drug. However, sulfadimethoxine is difficult to absorb, and 30% to 90% of it is excreted in the form of urine or feces. At present, sulfadimethoxine has been detected in environmental media such as urban sewage, river water, groundwater and soil, river and lake sediments in many countries. After entering the environment, it will stimulate pathogenic bacteria to develop drug resistance, and will enter the human body through the food chain, destroy the human hematopoietic system, cause hemolytic anemia, and affect human ...

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