Degradation of glyphosate herbicide by an electro-Fenton process using carbon felt cathode. Issue 8 (3rd April 2021)

• Record Type: Journal Article
• Authors: Tran, Manh Hai; Nguyen, Hoai Chau; Le, Thanh Son; Dang, Viet Anh Dung; Cao, The Ha; Le, Cao Khai; Dang, Trung-Dung
• Is Part Of: Environmental technology. Volume 42:Issue 8(2021)
• Page Start: 1155
• Page End: 1164
• Publication Date: 2021-04-03
• Subjects: Electro-Fenton -- hydroxyl radical -- glyphosate -- felt carbon -- herbicide removal; Environmental engineering -- Periodicals; Environmental protection -- Periodicals; 628.05
• DOI: 10.1080/09593330.2019.1660411
• Languages: English
• ISSNs: 0959-3330

Abstract

ABSTRACT: An electro-Fenton system, which consists of a Pt gauze anode and a commercial carbon felt cathode, is commonly employed to generate in situ hydrogen peroxide, hydroxyl radical and regenerate ferrous catalyst for glyphosate degradation (a widely used herbicide in Vietnam) in aqueous solution. The absorbance measurements used to determine the glyphosate concentration during the electrolysis proved that glyphosate was degraded by pseudo-first-order kinetic. The influence of pH, current density, catalyst concentration and initial content of the glyphosate on mineralisation efficiency were studied by monitoring the total organic carbon (TOC) and hydrogen peroxide concentration during electrolysis. The results show that the maximal removal percentage of glyphosate was 91.91% with applied current density of 10 mA cm −2, pH 3, 0.1 mM Fe 2+, 0.05 M Na2 SO4, and 0.1 mM glyphosate in 40 min. The degrading rate constant of glyphosate degradation was calculated to be k app = 0.063 min −1 . In this 91.91% removal, 81.65% of glyphosate was mineralised and the remainder consists of intermediates produced during the electro-Fenton process. GRAPHICAL ABSTRACT: UF0001