Pebax/POSS mixed matrix membranes for ethanol recovery from aqueous solutions via pervaporation

Ngoc Lieu Le, Yan Wang, Tai-Shung Chung*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

137 Scopus citations

Abstract

Novel mixed matrix membranes made of polyether-block-amide/polyhedral oligosilsesquioxane (Pebax/POSS) have been developed and investigated in this study for ethanol recovery via pervaporation separation. Two types of POSS; namely, octa(3-hydroxy-3-methylbutyldimethylsiloxy) (AL0136) and disilanolisobutyl (SO1440), were incorporated into Pebax membranes. The effects of POSS loading, feed ethanol concentration and feed temperature on pervaporation performance of the newly developed mixed matrix membranes (MMMs) have been studied. The incorporation of POSS nanoparticles improve the pervaporation performance of the hybrid membranes significantly. At 2wt.% POSS loading, both permeation flux and separation factor of ethanol/water reach maximum values, which are 183.5g/m2h and 4.6 for Pebax/AL0136 and 125.8g/m2h and 4.1 for Pebax/SO1440, respectively. Pebax/AL0136 MMMs give better performance than Pebax/SO1440 MMMs, probably due to its higher affinity towards ethanol. Experimental results show that an increase in feed ethanol concentration results in an increase in flux, but decreases in separation factor and membrane selectivity. Flux increases but permeability decreases with an increase in operating temperature due to the increase in driving forces and the reduction in permeant sorption, respectively. Separation factor and selectivity are also observed to increase with increasing operating temperature. The changes in driving force, cluster formation, membrane swelling and interaction among permeating molecules play essential roles for the observed trends. This work may provide useful insights of mixed matrix membranes, especially those containing POSS for pervaporation recovery applications.

Original languageEnglish (US)
Pages (from-to)174-183
Number of pages10
JournalJournal of Membrane Science
Volume379
Issue number1-2
DOIs
StatePublished - Sep 1 2011

Keywords

  • Ethanol recovery
  • Mixed matrix membrane
  • POSS
  • Pebax
  • Pervaporation

ASJC Scopus subject areas

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

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