eprintid: 10679
rev_number: 2
eprint_status: archive
userid: 1
dir: disk0/00/01/06/79
datestamp: 2023-11-09 16:37:17
lastmod: 2023-11-09 16:37:17
status_changed: 2023-11-09 16:31:57
type: article
metadata_visibility: show
creators_name: Nawi, N.I.M.
creators_name: Bilad, M.R.
creators_name: Nordin, N.A.H.M.
creators_name: Mavukkandy, M.O.
creators_name: Putra, Z.A.
creators_name: Wirzal, M.D.H.
creators_name: Jaafar, J.
creators_name: Khan, A.L.
title: Exploiting the interplay between liquid-liquid demixing and crystallization of the PVDF membrane for membrane distillation
ispublished: pub
keywords: Crystallinity; Distillation; Distilleries; Fluorine compounds; Fourier transform infrared spectroscopy; Liquids; Phase separation; Sodium chloride; Wetting, Cold temperatures; Degree of crystallinity; Hydrophobic membrane; Imperfect crystals; Liquid-liquid phase separation; Membrane distillation; Phase separation mechanism; Polyvinylidene fluoride membranes, Membranes
note: cited By 15
abstract: Membrane distillation (MD) purifies water by transporting its vapor through a hydrophobic membrane. An ideal MD membrane poses high water flux and high fouling, scaling, and wetting resistances. In this study, we develop polyvinylidene fluoride (PVDF) membranes for MD by focusing on reduction of PVDF degree of crystallinity. We explore the roles of dope solution temperature in dictating the phase separation mechanisms as well as the structure and the performance of semicrystalline PVDF membranes. DSC spectra show that higher dope solution temperature depresses crystallinity via formation of imperfect crystal. Such findings were also supported by FTIR and XRD results. The SEM images reveal formation of spherulite-like morphology in the membrane matrices for membranes prepared from high temperature dope solutions. A good balance between solid-liquid and liquid-liquid phase separations that offers low degree of crystallinity was found at a dope solution temperature of 60°C (PVDF-60), which showed the MD flux of 18 l/m2 h (vs. 6 l/m2 h for temperature of 25°C, as a benchmark) and nearly complete salt rejection when run at hot and cold temperatures of 65°C and 25°C, respectively. The PVDF-60 shows a high wetting resistance and stable MD flux of 10.5 l/m2 h over a 50 h test for treating brine solution as the feed (70 g NaCl/l). Copyright © 2018 N. I. M. Nawi et al.
date: 2018
publisher: Hindawi Limited
official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85062608423&doi=10.1155%2f2018%2f1525014&partnerID=40&md5=8e8beba5a45436d445882c7feb6da287
id_number: 10.1155/2018/1525014
full_text_status: none
publication: International Journal of Polymer Science
volume: 2018
refereed: TRUE
issn: 16879422
citation:   Nawi, N.I.M. and Bilad, M.R. and Nordin, N.A.H.M. and Mavukkandy, M.O. and Putra, Z.A. and Wirzal, M.D.H. and Jaafar, J. and Khan, A.L.  (2018) Exploiting the interplay between liquid-liquid demixing and crystallization of the PVDF membrane for membrane distillation.  International Journal of Polymer Science, 2018.   ISSN 16879422