Removal of thiram from aqueous solutions with adsorbents produced from coal mining waste

Abstract

Thiram (CAS Number: 137-26-8) is a widely used pesticide. In this study, its adsorption on adsorbents produced from coal mining waste was investigated. The equilibrium data were analyzed using the Langmuir and Freundlich isotherms. The adsorption kinetic results were interpreted by the Lagergren equation and the rate constants of adsorption were calculated for different initial concentrations as well as those of intraparticle diffusion rate. According to the Giles isotherm, the adsorbent was found to be a H-type one. Dubinin-Radushkevich (DR) equation was used to describe the adsorption mechanism. The mean energy of sorption was found to be 0.55 kJ/mol, which is in the energy range for physical sorption (0-8 kJ/mol).