Water vapor permeation and dehumidification performance of poly(vinyl alcohol)/lithium chloride composite membranes

Duc Thuan Bui, Aqdas Nida, Kim Choon Ng, Kian Jon Chua

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

Thin and robust composite membranes comprising stainless steel scaffold, fine and porous TiO2 and polyvinyl alcohol/lithium chloride were fabricated and studied for air dehumidification application. Higher hydrophilicity, sorption and permeation were observed for membranes with increased lithium chloride content up to 50%. The permeation and sorption properties of the membranes were investigated under different temperatures. The results provided a deeper insight into the membrane water vapor permeation process. It was specifically noted that lithium chloride significantly reduces water diffusion energy barrier, resulting in the change of permeation energy from positive to negative values. Higher water vapor permeance was observed for the membrane with higher LiCl content at lower temperature. The isothermal air dehumidification tests show that the membrane is suitable for dehumidifying air in high humid condition. Additionally, results also indicate a trade-off between the humidity ratio drop with the water vapor removal rate when varying air flowrate.
Original languageEnglish (US)
Pages (from-to)254-262
Number of pages9
JournalJournal of Membrane Science
Volume498
DOIs
StatePublished - Oct 21 2015

ASJC Scopus subject areas

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

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