氩等离子体技术降解玉米表面毒死蜱的研究

To overcome the shortcomings of the conventional methods for pesticides degradation, such as low efficiency, high energy consumption, and secondary pollution, a self-designed dielectric barrier discharge reactor was used to degrade pesticides on maize, and chlorpyrifos was chosen as the research object. The effects of chlorpyrifos degradation, as well as the surface characteristics and the nutrients of maize, after degradation were studied by changing the discharge parameters (discharge power, treatment time, discharge gap), initial concentration of chlorpyrifos, and argon flux. The results showed that at discharge power of 35 W, treatment time of 60 s, discharge gap of 6 mm and argon flux of 0.25 L/min, 87% of chlorpyrifos with initial concentration of 20 mg/L could be successfully degraded, which met the national standard about pesticide residues. In the process of pesticides degradation, argon plasma treatment attributed to slight etching on the surface of maize, which could reduce the water content of maize and is conducive to storage. Moreover, there was no significant change in vitamin B₂ content and there was slight change in starch content and fatty acid value for the treated maize, but the quality and storage value were not affected. Therefore, argon plasma has been proved an efficient, fast, and safe technology without pollution for pesticides degradation, so it has a lot of potential for further industrial application.