Removal of carbofuran and methylparathion from aqueous media through calix[4]arene-based impregnated resin

The present study explores the synthesis of impregnated resin and its adsorption efficiency for the removal of carbofuran and methylparathion from aqueous media through static and dynamic adsorption methods. Different factors that affect the adsorption process were optimized as pH 5, adsorbent dosage 30 mg and agitation time 45 min for carbofuran and 60 min for methylparathion. The adsorption data were found to be best fitted with Freundlich isotherm and follow pseudo-second-order kinetic model. In addition to this, it was found from intraparticle diffusion model which explores that the adsorption of both pesticides may involve the film diffusion process as the rate limiting step. Thomas model rate constant (k(TH)) was found to be 0.0015 cm(3) mg(-1) min(-1) for both pesticides, whereas maximum solid-phase concentration (q(0)) was found to be 22.58 and 34.05 mg g(-1) for carbofuran and methylparathion, respectively, through dynamic adsorption study. The resin can be regenerated and reused effectively for real water samples.