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Rapid removal of diclofenac in aqueous solution by soluble Mn(III) (aq) generated in a novel Electro-activated carbon fiber-permanganate (E-ACF-PM) process.

Authors
  • Zhu, Yunhua1
  • Zhao, Chun2
  • Liang, Jialiang3
  • Shang, Ran4
  • Zhu, Xuanmo1
  • Ding, Lei5
  • Deng, Huiping6
  • Zheng, Huaili1
  • Strathmann, Timothy J7
  • 1 State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, PR China; Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, PR China. , (China)
  • 2 State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, PR China; Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, PR China. Electronic address: [email protected] , (China)
  • 3 Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, PR China. , (China)
  • 4 Delft University of Technology, P.O. Box 5048, 2600, GA, Delft, the Netherlands. , (Netherlands)
  • 5 School of Civil Engineering and Architecture, Anhui University of Technology, 59 Hudong Road, Maanshan, 243002, PR China. , (China)
  • 6 Key Laboratory of Yangtze River Water Environment, Ministry of Education, Tongji University, Shanghai, 200092, PR China. , (China)
  • 7 Department of Civil and Environmental Engineering, Colorado School of Mines, Golden, CO, 80401, USA.
Type
Published Article
Journal
Water research
Publication Date
Aug 12, 2019
Volume
165
Pages
114975–114975
Identifiers
DOI: 10.1016/j.watres.2019.114975
PMID: 31430653
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Electrolysis and permanganate (PM) oxidation are two commonly used technologies for water treatment. However, they are often handicapped by their slow reaction rates. To improve the removal efficiency of refractory contaminants, we combined electrolysis with PM using an activated carbon fiber (ACF) as cathode (E-ACF-PM) for the first time to treat diclofenac (DCF) in aqueous solution. Up to 90% DCF was removed in 5 min by E-ACF-PM process. In comparison, only 3.95 and 27.35% of DCF was removed by individual electrolysis and PM oxidation at the same time, respectively. Acidic condition was more conducive to DCF removal. Surprisingly, soluble Mn(III) (aq) formed on the surface of ACF was demonstrated as the principal oxidizing agent in E-ACF-PM process. Further studies showed that all three components (electrolysis + ACF + PM) were necessary to facilitate the heterogeneous generation of reactive Mn(III) (aq). Moreover, SEM images and XPS spectra of ACF before and after treatment revealed that the morphologies and elemental compositions of reacted ACF were nearly unchanged during the E-ACF-PM process. ACF can be remained active and utilized to the rapid degradation of DCF in E-ACF-PM process even after reused for 20 times. Therefore, the E-ACF-PM process may provide a novel and effective alternative on the generation of reactive Mn(III) (aq) in situ for water treatment by green electrochemical reactions. Copyright © 2019 Elsevier Ltd. All rights reserved.

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