Removal of glyphosate from water by electrochemically assisted MnO2 oxidation process

被引：41

作者：

Lan, Huachun ^{[1
,2
]}

Jiao, Zhaofei ^{[1
]}

Zhao, Xu ^{[1
]}

He, Wenjing ^{[1
]}

Wang, Aimin ^{[3
]}

Liu, Huijuan ^{[1
]}

Liu, Ruiping ^{[1
]}

Qu, Jiuhui ^{[1
]}

机构：

[1] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Aquat Chem, Beijing 100085, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100039, Peoples R China

[3] Beijing Jiaotong Univ, Beijing 100044, Peoples R China

来源：

SEPARATION AND PURIFICATION TECHNOLOGY | 2013年 / 117卷

基金：

中国国家自然科学基金;

关键词：

Glyphosate; Oxidation; MnO2; Electrochemical process; Water; AQUEOUS-SOLUTION; PHOSPHONIC ACID; DEGRADATION; CHROMATOGRAPHY; CHLORINATION; ADSORPTION; MANGANESE; PRODUCTS; GLYCINE;

D O I：

10.1016/j.seppur.2013.04.012

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Glyphosate, one of the organophosphate herbicides, has been widely used in the word. The removal of glyphosate was comparatively investigated by MnO2 oxidation, electrochemical oxidation, and electrochemically assisted MnO2 oxidation (electro-MnO2) processes. The effects of MnO2 dosage, current density, and solution pH on glyphosate removal and Mn2+ release were examined. The results indicated that the removal of glyphosate by MnO2 oxidation favored acidic pH conditions and a large portion of Mn2+ ions were released from MnO2. With the electro-MnO2 process using RuO2/TiO2 coated titanium mesh as both anode and cathode, glyphosate removal was significantly promoted and most of the released Mn2+ ions were oxidatively reverted to MnO2, which in turn enhanced the removal of glyphosate. Solution pH exerted an insignificant effect on glyphosate removal in the electro-MnO2 process. Major reaction intermediates including sarcosine, glycine, and PO43- were indentified in the initial phase of the MnO2 oxidation and electro-MnO2 processes. Glycine was further decomposed to glycolic acid and NH3-N in the MnO2 oxidation process; in contrast, glycine was oxidized into oxamic acid, glycolic acid and N-contained intermediates, and N-contained intermediates could be finally oxidized into acetic acid, NH3-N and NO3--N in the electro-MnO2 process. Crown Copyright (c) 2013 Published by Elsevier B.V. All rights reserved.

引用

页码：30 / 34

页数：5