Study On The Adsorption And Sustained-release Performances Of Activated Carbon Fiber To Neonicotinoid Insecticides

As we all know,pesticide plays a crucial role in the development of agriculture.In rencent years,the unreasonable use of agriculture chemicals and the low utilization rate of traditional dosage pesticide have brought serious environmental problems.With the development of science and technology,more standard application of pesticide is concentrated on the issue of security and environment and there is an urgent request for the pesticide that accord with the standard of health and environmental friendly and increasing disease control as well.The slow release pesticide has attracted great attention in application due to its unique advantages such as lower toxity,fewer frequency of use and prolonging the period of validity etc.This paper mainly used activated carbon fiber as carrier,Study on the adsorption properties and slow-release properties of activated carbon fiber to three kinds of neonicotinoid insecticides.The influence of different factors on the adsorption properties of activated carbon fiber are discussed.Based on the research above,the thesis furthers its study on the pesticide-loading mechanism in terms of its dynamic and thermodynamic features and its sustained-release function.The research results are as follows:(1)Significantly affected the adsorbent dosage of ACF.With the increase of the adsorbent dosage,pesticide adsorption rate increased.(2)Study on thermodynamics and kinetics of ACF adsorption of neonicotinoid insecticides,the results showed that two kinds of isothermal adsorption model can be used to describe the adsorption process.But the Langmuir model had better fitting results.The process of ACF adsorption of neonicotinoid insecticides fits the quasi-second-order model.(3)Produce three sustained release systems to study its slow-release properties,The results show that the effect of ACF on drug release of three pesticides are better.The release kinetics of the three kinds of pesticide can be described by Ritger-Peppas model;their release can be explained by and highly relevant to Fick Diffusion Mechanism.