Controlled pore collapse to increase solute rejection of modified PES membranes

Libor Zverina, Marcus Koch, Mads F. Andersen, Manuel Pinelo, John M. Woodley, Anders E. Daugaard*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Pore collapse upon drying is a well-known phenomenon in ultrafiltration PES membranes. Here we demonstrate how alteration of membrane surface chemistry can be used to control the extent of pore collapse and ultimately to tailor membrane properties. Commercial hollow-fiber PES membranes were modified via surface-initiated ATRP to obtain different polymer-grafted membranes and were subsequently dried to facilitate pore collapse. The different polymer grafts could be used for controlling the water flux and solute rejection characteristics of the membranes. Controlled membrane pore collapse could be exploited to obtain higher rejection of sodium chloride, magnesium sulfate and calcein. Calcein as the largest solute showed almost full rejection (98.9 ± 0.3%) on the membrane. The chemical nature of the grafted polymer was directly reflected in the water flux-to-rejection ratio and the extent of pore collapse.
Original languageEnglish
Article number117515
JournalJournal of Membrane Science
Volume595
Number of pages27
ISSN0376-7388
DOIs
Publication statusPublished - 2020

Keywords

  • Commercial hollow-fiber polyethersulfone membrane
  • Surface functionalization
  • Heterogeneous reaction
  • Solute rejection
  • Controlled pore collapse
  • SI-ATRP

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