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Non-steady diffusion and adsorption of organic micropollutants in ion-exchange membranes : effect of the membrane thickness

Authors
  • Roman, Malgorzata
  • Roman, Pawel
  • Verbeke, Rhea
  • Gutierrez, Leonardo
  • Vanoppen, Marjolein
  • Dickmann, Marcel
  • Egger, Werner
  • Vankelecom, Ivo
  • Post, Jan
  • Cornelissen, Emile
  • Keesman, Karel
  • Verliefde, Arne
Publication Date
Jan 01, 2021
Identifiers
DOI: 10.1016/j.isci.2021.102095
OAI: oai:archive.ugent.be:8696527
Source
Ghent University Institutional Archive
Keywords
Language
English
License
Green
External links

Abstract

There is no efficient wastewater treatment solution for removing organic micropollutants ( OMPs), which, therefore, are continuously introduced to the Earth's surface waters. This creates a severe risk to aquatic ecosystems and human health. In emerging water treatment processes based on ion-exchange membranes (IEM), transport of OMPs through membranes remains unknown. We performed a comprehensive investigation of theOMPtransport through a single IEM under non- steady-state conditions. For the first time, positron annihilation lifetime spectroscopy was used to study differences in the free volume element radius between anion- and cation-exchangemembranes, and between their thicknesses. The dynamic diffusion-adsorption model was used to calculate the adsorption and diffusion coefficients ofOMPs. Remarkably, diffusion coefficients increased with the membrane thickness, where its surface resistance was more evident in thinner membranes. Presented results will contribute to the improved design of next-generation IEMs with higher selectivity toward multiple types of organic compounds.

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