Removal of phenoxyacetic acid based herbicides by crosslinked poly(N-vinyl pyrrolidone)

Abstract

In this study, binding of herbicides such as p-chlorophenoxyacetic acid, 2,4-dichlorophenoxyacetic acid and the ammonium salt of 2,4-dichlorophenoxyacetic acid onto poly(N-vinyl pyrrolidone) and the adsorption of these herbicides to crosslinked poly(N-vinyl pyrrolidone) are investigated. It is shown that there are electrostatic interactions between anionic sites of the herbicides with cationic sites of poly(N-vinyl pyrrolidone). The adsorption of these herbicides to crosslinked poly(N-vinyl pyrrolidone) shows Type III adsorption isotherms. The values of percentage sorption of the low concentrations of herbicides are higher than those at the high concentrations of herbicides.