Decontamination of water polluted with pesticide using biopolymers: Adsorption of glyphosate by chitin and chitosan

Abstract

This present work focus on the efficiency of chitin and chitosan with respect to herbicide glyphosate adsorption under different experimental conditions, such as pH, contact time and pesticide concentration. Adsorption characteristics were obtained from experimental isotherms that were confronted to Langmuir and Freundlich models. It was found that glyphosate adsorption was likely fitted by Langmuir model giving the maximal adsorbed amount within monolayer. Adsorption was most effective within the pH ranging from 3.76 to 5.04. On the other hand, desorption experiments show a maximum recovery of 63.76 % for chitin and 9.67% for chitosan.