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Electrochemical modification of activated carbon fiber as 3-D particle electrodes: characterization and enhancement for the degradation of m-cresol

Authors
  • Liu, Weijun1, 2
  • Hu, Xiang1, 2
  • Sun, Zhirong3
  • Duan, Pingzhou1, 2
  • 1 Beijing University of Chemical Technology, College of Chemical Engineering, Beijing, 100029, People’s Republic of China , Beijing (China)
  • 2 Research Center for Environmental Pollution Control and Resource Reuse Engineering of Beijing City, Beijing, 100029, People’s Republic of China , Beijing (China)
  • 3 Beijing University of Technology, College of Environmental & Energy Engineering, Beijing, 100124, People’s Republic of China , Beijing (China)
Type
Published Article
Journal
Environmental Science and Pollution Research
Publisher
Springer-Verlag
Publication Date
Apr 13, 2019
Volume
26
Issue
16
Pages
16433–16448
Identifiers
DOI: 10.1007/s11356-019-04979-5
Source
Springer Nature
Keywords
License
Yellow

Abstract

Commercial activated carbon fiber (ACF) has been employed as particle electrodes to degrade aqueous m-cresol in 3-D electrode systems. To enhance the electrooxidation performance, three types of new ACF modification modes (anodic oxidation, cathodic reduction, and aqueous oxidation with concentrated HNO3) were introduced in this paper. These pretreated samples were characterized by N2 adsorption, scanning electron microscopy (SEM), cyclic voltammetry (CV), temperature-programmed desorption mass (TPD-MS), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FT-IR). It was revealed that the two new modification methods could efficiently modify the surface morphology as well as the chemical property. Eight types of surface oxygen groups (SOGs) were identified on the surface of ACF, and the types and amount of SOGs might be related to the oxidation effect of ACF on the 3-D electrodes. The effect and mechanism of these SOGs on electrooxidation performance were discussed with the aid of the frontier molecular orbital theory. It was demonstrated that the H2O2–·OH reaction mechanism was improved in the 3-D electrode system and the mechanism was elucidated.

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