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Molecular levels unveil the membrane fouling mitigation mechanism of a superpotent N-rGO catalytic ozonation membrane: Interfacial catalytic reaction pathway and induced EfOM transformation reactions

  • Zilong Song
  • , Zhenbei Wang
  • , Jun Ma
  • , Jingyi Sun
  • , Chen Li
  • , Xiaotong Xu
  • , Chao Chen
  • , Zhonglin Chen
  • , Bingbing Xu
  • , Yi Jiang
  • , Jolanta Kumirska
  • , Ewa Maria Siedlecka
  • , Amir Ikhlaq
  • , Fei Qi*
  • , Oksana Ismailova
  • *Corresponding author for this work
  • Beijing Forestry University
  • School of Environment, Harbin Institute of Technology
  • Chinese Research Academy of Environmental Sciences
  • Hong Kong Polytechnic University
  • University of Gdańsk
  • University of Engineering and Technology Lahore
  • Tashkent State Technical University
  • Turin Polytechnic University in Tashkent

Research output: Contribution to journalArticlepeer-review

Abstract

This study investigated the membrane fouling self-cleaning of N-doped reduced graphene oxide (N-rGO)-tailored ceramic membrane with ozone (N-rGO-CM-O/F) at the molecular level. Density functional theoretical (DFT) revealed the principle of interfacial catalytic reaction, and the transformation of foulants was probed using Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) and various spectroscopic techniques. Results showed that ozone could be aggregated on the N-rGO-CM surface and formed abundant OH. This made humic acid-like substances blocking membrane pores to be sufficiently and preferentially removed in N-rGO-CM-O/F by 18-types reactions of catalytic ozonation. Conversely, CM-O/F preferentially removed protein-like substances that formed the cake layer. Due to the stronger catalytic ozonation ability and efficient fouling mitigation behavior, N-rGO-CM-O/F showed higher water flux as 1.96 times than that of CM-O/F. Overall, this study provided molecular insight into the mechanism of membrane fouling mitigation, which will facilitate the design and application of advanced catalytic membranes.

Original languageEnglish
Article number121943
JournalApplied Catalysis B: Environmental
Volume319
DOIs
StatePublished - 15 Dec 2022
Externally publishedYes

Keywords

  • Catalytic ozonation membrane
  • Density functional theory
  • FT-ICR-MS
  • Membrane fouling
  • N-doped grapheme

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