Investigation of Poly(ethersulfone)/Polyvinylpyrrolidone ultrafiltration membrane degradation by contact with sodium hypochlorite through FTIR mapping and two-dimensional correlation spectroscopy

J. Chokki, G. Darracq, Peter Pölt, J. Baron, H Gallard, M. Joyeux, B. Teychene

Research output: Contribution to journalArticle

Abstract

It is well recognized that chlorine is responsible for aging of membrane materials. The goal of this study is to investigate the modifications of a commercial PES/PVP hollow fiber membrane exposed to hypochlorite solution at pH 7.5 by continuous filtration. Thanks to ATR-FTIR 2D Correlation Spectroscopy (2DCoS) analysis it was confirmed that PVP is oxidized into succinimide compound. 2DCoS analysis revealed the sequence order of PES/PVP membrane degradation: PVP oxidation is followed by the modifications of C-H cyclic structures and finally the formation of succinimide compounds. ATR-FTIR-microscopy mapping unveiled that PVP was mainly situated at the inner surface of hollow fibers exhibiting initially a 67 μm thickness layer. PVP layer disappearance was not homogenous versus the exposure dose suggesting the topochemical character of the PVP-chlorine reaction. Results demonstrate that advanced material characterization are key methodologies to understand membrane aging mechanisms.

Original languageEnglish
Pages (from-to)131 - 138
Number of pages8
JournalPolymer degradation and stability
Volume161
DOIs
Publication statusPublished - 2019

Keywords

  • 2DCoS
  • FTIR-Mapping
  • Membrane aging
  • PES/PVP membrane
  • Sodium hypochlorite
  • Ultrafiltration

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Materials Chemistry
  • Polymers and Plastics

Fields of Expertise

  • Advanced Materials Science

Treatment code (Nähere Zuordnung)

  • Experimental

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