Decomposition of Simazine by Fe@Fe2O3 core-shell nanowires:enhancement of activate molecular oxygen in the present ofFe (Ⅱ)

摘要

The decomposition of herbicide 2-chloro-4,6-bis (ethylamino)-s-trazine (simazine) was investigated by activate molecular oxygen using the Fe@Fe2O3 core-shell nanowires and Fe (Ⅲ).The properties of Fe@Fe2O3 before and after reaction were characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS).The characterizations results revealed the Fe0 core was corroded faster in the present of Fe (Ⅱ),and the Fe3O4 generated on the surface of shell was advantageof the electron transfer.We have also determined the reactive oxygen species (ROS) and concluded that the alteration of the shell could improve the generation of hydroxyl radicals.The degradation intermediates of simazine were determined by HPLC/MS,GC/MS,and IC.We proposed the possible mechanistic steps of Simazine degradation,which are mainly related to the dealkylation reaction.This novel molecular oxygen activation approach may provide potentials for wastewater treatment and groundwater purification.