Complete and rapid degradation of glyphosate with Fe 3 Ce 1 O x catalyst for peroxymonosulfate activation at room temperature.

Autor: Xue L; School of Environmental Science & Engineering, Tianjin University, Jinnan District, Tianjin, 300350, China., Hao L; School of Environmental Science & Engineering, Tianjin University, Jinnan District, Tianjin, 300350, China., Ding H; School of Environmental Science & Engineering, Tianjin University, Jinnan District, Tianjin, 300350, China. Electronic address: dinghui@tju.edu.cn., Liu R; School of Environmental Science & Engineering, Tianjin University, Jinnan District, Tianjin, 300350, China., Zhao D; School of Environmental Science & Engineering, Tianjin University, Jinnan District, Tianjin, 300350, China., Fu J; School of Environmental Science & Engineering, Tianjin University, Jinnan District, Tianjin, 300350, China., Zhang M; Huadian Aqua Membrane Separation Technology (Tianjin) Co. Ltd., Tianjin, 301700, China.
Jazyk: angličtina
Zdroj: Environmental research [Environ Res] 2021 Oct; Vol. 201, pp. 111618. Date of Electronic Publication: 2021 Jul 06.
DOI: 10.1016/j.envres.2021.111618
Abstrakt: Glyphosate, a common broad-spectrum herbicide, is a serious environmental pollutant that causes a significant threat to humans. Hence, there is a pressing task to remove glyphosate from the environment. Here, we report an excellent Fe 3 Ce 1 O x catalyst synthesized via the one-step co-precipitation method for activating peroxymonosulfate (PMS) to degrade glyphosate at 25 °C. As a result, glyphosate is completely degraded with a high degradation rate of 400 mg L -1 ·h -1 , and the TOC and TN removals are 85.6% and 80.8%, respectively. As proven by systematic characterizations, the Fe-Ce synergistic effect plays a significant role in promoting PMS activation. The main reactive oxygen species for glyphosate oxidation are surface-bound SO 4 - · and ·OH, produced by activating PMS by electron transfer between Fe 2+ /Fe 3+ and Ce 3+ /Ce 4+ of Fe 3 Ce 1 O x . In light of the products determined, the possible degradation process of glyphosate is also speculated: C-N and C-P bonds of glyphosate molecules are attacked to form aminomethylphosphonic acid (AMPA) and orthophosphate (PO 4 3- ) by surface-bound SO 4 - · and ·OH that continuously mineralize and dephosphorylate AMPA to generate small molecules and inorganic ions, such as H 2 O and PO 4 3- . The results of this work suggest that Fe 3 Ce 1 O x /PMS could provide a potential candidate for efficiently removing organic compounds containing nitrogen or phosphorus from wastewater.
(Copyright © 2021 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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