Electrospun dual-layer nonwoven membrane for desalination by air gap membrane distillation

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • Yun Chul Woo
  • Leonard D. Tijing
  • Myoung Jun Park
  • Minwei Yao
  • June-Seok Choi
  • Sangho Lee
  • Seung-Hyun Kim
  • Ho Kyong Shon

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)187-198
Journal / PublicationDesalination
Volume403
Online published16 Sep 2015
Publication statusPublished - 1 Feb 2017

Abstract

In the present study, dual-layer nanofiber nonwoven membranes were prepared by a facile electrospinning technique and applied for desalination by air gap membrane distillation (AGMD). Neat single and dual-layer nanofiber membranes composed of a hydrophobic polyvinylidene fluoride-co-hexafluoropropylene (PH) top layer with different supporting hydrophilic layer made of either polyvinyl alcohol (PVA), nylon-6 (N6), or polyacrylonitrile (PAN) nanofibers were fabricated with and without heat-press post-treatment. Surface characterization showed that the active layer (i.e., PH) of all electrospun nanofiber membranes (ENMs) exhibited a rough, highly porous (> 80% porosity), and hydrophobic surface (CA > 140°), while the other side was hydrophilic (CA <90°) with varying porosity. Heat-pressing the membrane resulted to thinner thickness (from > 129 μm to <100 μm) and smaller pore sizes (<0.27 μm). The AGMD experiments in a co-current flow set-up were carried out with constant inlet temperatures at the feed and permeate streams of 60 ± 1.5 and 20 ± 1.5° C, respectively. The AGMD module had a membrane area of 21 cm2 and the thickness of the air gap was 3 mm. The neat single and dual-layer ENMs showed a water permeate flux of about 10.9–15.5 L/m2 h (LMH) using 3.5 wt.% NaCl solution as feed, which was much higher than that of a commercial PVDF membrane (~ 5 LMH). The provision of a hydrophilic layer at the bottom layer enhanced the AGMD performance depending on the wettability and characteristics of the support layer. The PH/N6 dual-layer nanofiber membrane prepared under the optimum condition showed flux and salt rejection of 15.5 LMH and 99.2%, respectively, which has good potential for AGMD application.

Research Area(s)

  • Air gap membrane distillation, Desalination, Dual-layer nonwoven membrane, Electrospinning, Nanofiber

Citation Format(s)

Electrospun dual-layer nonwoven membrane for desalination by air gap membrane distillation. / Woo, Yun Chul; Tijing, Leonard D.; Park, Myoung Jun; Yao, Minwei; Choi, June-Seok; Lee, Sangho; Kim, Seung-Hyun; An, Kyoung-Jin; Shon, Ho Kyong.

In: Desalination, Vol. 403, 01.02.2017, p. 187-198.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal