Synthesis, characterization and alteration of phenoxyherbicides-based nanocomposites resulted from mixing two herbicides with Zinc Oxide-layered hydroxide

Abstract

The present study is a part of an investigation of the effect of ZnO supported for two mixed agent (4-chlorophenoxy acetate (4CPA) as plant growth regulator  and 2,4-dichlorophenoxyacetates (2,4D) as herbicide ) synthesis via the ionic exchange with zinc Oxide layered hydroxide(LH). The product of this process led to the formation of nanocomposites assigned as (Zinc-NCPA). This byproduct represented a mixture of two newly phases was confirmed by X-Ray Diffraction (XRD) which were visualized at 25.6 and 19.14 Å, respectively. These findings were approved by images produced by Scanning Electron Microscopy (SEM). The maximum accumulated release of 4CPA and 2,4D was found to depend on the concentrations of the incoming ions. The accumulated rate of 4CPA was found to be less than 24D. The release behavior of the phenoxy acetate into the aqueous solution was controlled mainly by pseudo-second-order which was followed by pseudo-first order rate expression. This study concluded that Zinc Oxide layered hydroxide (ZLH) have the capability to act as a carrier for mixed active agents of two compounds with two different roles.

^aCorresponding author E.mail:abbasmatrood@yahoo.com

Keywords: Controlled release, chlorophenoxy acetates, Zinc Oxide layered hydroxide, organic-inorganic hybrid nanocomposites