Sorption Mechanisms Of Carbaryl Onto Soils And Carbon Adsorbent

This paper studied the adsorption/desorption behavior of pesticide carbaryl in the soil and carbon adsorbent and effection of CaCl₂ concentration on the adsorption/desorption,Compared the impaction of absorption and desorption to the carbaryl in the soil by adding artificial charcoal and activated carbon.The results show that:(1) Respectively,with linear isotherm,Freundlich isotherm and Langmuir isotherm of carbaryl in different adsorbent adsorption isotherms fitted,Freundlich adsorption isotherm equation can be better to describe the adsorption isotherm.(2) The adsorption capacity of carbaryl are lower,With CaCl₂ concentration increased.(3) Before and after 6h the adsorption,It found that Elovich rate equation in different absorbent obviously show two process of the rapid and slow absorption and adsorption.(4) In three of the adsorbent desorption process to show both fast and slow process.Desorption process is likely the reverse of the process of absorption,rapid absorption regional could cause rapid desorption,slow absorption regional could cause slow desorption.(5) The desorption role hysteresis of the pesticides on the soil of organic pollutants in the environment has related to the main types of carbon in the soil and the nature and content of the material,C-type material on the pesticide in the soil has the isolation function.