Peroxydisulfate-based Non-radical Oxidation of Rhodamine B by Fe-Mn Doped Granular Activated Carbon: Kinetics and Mechanism Study.

Autor: Wu J; Advanced Water Technology Laboratory, National University of Singapore (Suzhou) Research Institute, No.377 Linquan Street, Suzhou Industrial Park, Suzhou, Jiangsu, 215123, China., Yang X; Advanced Water Technology Laboratory, National University of Singapore (Suzhou) Research Institute, No.377 Linquan Street, Suzhou Industrial Park, Suzhou, Jiangsu, 215123, China., Xu D; Advanced Water Technology Laboratory, National University of Singapore (Suzhou) Research Institute, No.377 Linquan Street, Suzhou Industrial Park, Suzhou, Jiangsu, 215123, China., Ong SL; Advanced Water Technology Laboratory, National University of Singapore (Suzhou) Research Institute, No.377 Linquan Street, Suzhou Industrial Park, Suzhou, Jiangsu, 215123, China.; Department of Civil & Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore, 117576, Singapore., Hu J; Advanced Water Technology Laboratory, National University of Singapore (Suzhou) Research Institute, No.377 Linquan Street, Suzhou Industrial Park, Suzhou, Jiangsu, 215123, China.; Department of Civil & Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore, 117576, Singapore.
Jazyk: angličtina
Zdroj: Chemistry, an Asian journal [Chem Asian J] 2024 Aug 01; Vol. 19 (15), pp. e202400482. Date of Electronic Publication: 2024 Jul 08.
DOI: 10.1002/asia.202400482
Abstrakt: While numerous persulfate-based advanced oxidation processes (AOPs) have been studied based on fancy catalysts, the practical combination of Fe or Mn modified granular activated carbon (GAC) has seldom been investigated. The present study focused on a green and readily synthesized Fe-Mn bimetallic oxide doped GAC (Fe-Mn@GAC), to uncover its catalytic kinetics and mechanism when used in the peroxydisulfate (PDS)-based oxidation process for degrading Rhodamine B (RhB), a representative xenobiotic dye. The synthesized Fe-Mn@GAC was characterized by SEM-EDS, XRD, ICP-OES and XPS analyses to confirm its physicochemical properties. The catalytic kinetics of Fe-Mn@GAC+PDS system were evaluated under varying conditions, including PDS and catalyst dosages, solution pH, and the presence of anions. It was found Fe-Mn@GAC exhibited robust catalytic performance, being insensitive to a wide pH range from 3 to 11, and the presence of anions such as Cl - , SO 4 2- , NO 3 - and CO 3 2- . The catalytic mechanism was investigated by EPR and quenching experiments. The results indicated the catalytic system processed a non-radical oxidation pathway, dominated by direct electron transfer between RhB and Fe-Mn@GAC, with singlet oxygen ( 1 O 2 ) playing a secondary role. The catalytic system also managed to maintain a RhB removal above 81 % in successive 10 cycles, and recover to 89.5 % after simple DI water rinse, showing great reusability. The catalytic system was further challenged by real dye-containing wastewater, achieving a decolorization rate of 84.5 %. This work not only provides fresh insight into the kinetics and mechanism of the Fe-Mn@GAC+PDS catalytic system, but also demonstrates its potential in the practical application in real dye-containing wastewater treatment.
(© 2024 The Authors. Chemistry - An Asian Journal published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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