MORPHOLOGY OF POLYMERIC RESINS IN ADSORPTION OF ORGANIC PESTICIDES

摘要

Scanning Electron Microscopy (SEM) technique was applied for the investigation of the resin surface in pesticide adsorption. Static adsorption experiments were performed for the removal of alachlor, trifluralin, prometryn and amitrole from their aqueous solution on two polymeric resins (divinylbenzene - polystyrene copolymer XAD-4 and polyacrylic ester XAD-7). The obtained SEM images revealed the alteration of the surface morphology of the resin particles with regard to that of the untreated particles. Pesticides adsorption was determined from the reduction of the concentration of dissolved pesticides in aqueous solutions by High Performance Liquid Chromatography (HPLC) analysis. The results of SEM technique supported the phenomenon of pesticides adsorption, giving more information on the changes occurring at the resin surface.