Superhydrophobic electrospun membrane for heavy metals removal by air gap membrane distillation (AGMD)

Hadi Attia, Shirin Alexander, Chris J. Wright, Nidal Hilal

Research output: Contribution to journalArticle

Abstract

This paper presents a novel approach to fabricate superhydrophobic membranes by using environmentally friendly and cost effective superhydrophobic nanoparticles to enhance nanofibrous membrane performance in term of flux and rejection of heavy metals in membrane distillation applications. Polyvinylidene fluoride (PVDF) membranes were fabricated using an electrospinning technique, in which electrospinning parameters such as polymer concentration, voltage, solvent ratio, and cationic surfactant were studied to optimize the membrane fibre diameters and produce beadless nanofibrous membranes. The nanofibrous membranes were characterized in terms of pore size, porosity, liquid entry pressure, contact angle, permeate flux and rejection percentage, and were compared to a commercial membrane. Air gap membrane distillation (AGMD) was used to demonstrate the improved ability of superhydrophobic PVDF membranes for removing heavy metals (such as lead) in comparison with pristine and commercial membranes. The results showed that pristine beadless membrane mat can be fabricated by using 15 wt% polymer concentration, 0.05 wt% cationic surfactant with 6:4 DMF to acetone ratio and 14 KV with lead rejection rate of 72.77%, liquid entry pressure (17 psi) and water contact angle of 132°. In comparison, the composite 11 wt% PVDF membranes with 20 wt% of functionalized alumina (Al2O3) showed 150° WCA and 27 psi as liquid entry pressure which led to 99.36% of heavy metal rejection and 5.9% increase in permeate flux.

Original languageEnglish (US)
Pages (from-to)318-329
Number of pages12
JournalDesalination
Volume420
DOIs
StatePublished - Oct 15 2017

Keywords

  • Electrospinning
  • Heavy metals
  • Membrane distillation
  • Superhydrophobic membrane
  • Superhydrophobic nanoparticles
  • Surfactant

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)
  • Water Science and Technology
  • Mechanical Engineering

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