Engineering flat sheet microporous PVDF films for membrane distillation

Siamak Nejati, Chanhee Boo, Chinedum O. Osuji, Menachem Elimelech

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

A simple phase inversion technique to fabricate hydrophobic microporous films for membrane distillation (MD) is presented. Polyvinylidene fluoride (PVDF) dissolved in triethyl phosphate (TEP) was used as a casting solution with a coagulation bath comprising 2-propanol and water. The effect of processing parameters (PVDF concentration and molecular weight, and composition of coagulation bath) on membrane performance was systematically investigated. Our results demonstrate that an MD membrane with desirable properties can be achieved by carefully controlling the casting parameters. The fabricated membranes exhibited asymmetric structure with a dense top layer and highly porous bottom substrate, and showed markedly different performance (i.e., water vapor flux) depending on the MD membrane orientation. Our results suggest that membrane surface porosity as well as the structure of the membrane are the key factors determining MD membrane performance.

Original languageEnglish (US)
Pages (from-to)355-363
Number of pages9
JournalJournal of Membrane Science
Volume492
DOIs
StatePublished - Oct 5 2015
Externally publishedYes

Fingerprint

Distillation
distillation
vinylidene
fluorides
engineering
membranes
Membranes
coagulation
Coagulation
Baths
baths
Casting
polyvinylidene fluoride
2-Propanol
Porosity
Steam
Propanol
Water vapor
water vapor
molecular weight

Keywords

  • Hydrophobicity
  • Membrane distillation
  • Phase inversion
  • Polyvinylidene fluoride
  • Surface porosity

ASJC Scopus subject areas

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

Cite this

Engineering flat sheet microporous PVDF films for membrane distillation. / Nejati, Siamak; Boo, Chanhee; Osuji, Chinedum O.; Elimelech, Menachem.

In: Journal of Membrane Science, Vol. 492, 05.10.2015, p. 355-363.

Research output: Contribution to journalArticle

Nejati, Siamak ; Boo, Chanhee ; Osuji, Chinedum O. ; Elimelech, Menachem. / Engineering flat sheet microporous PVDF films for membrane distillation. In: Journal of Membrane Science. 2015 ; Vol. 492. pp. 355-363.
@article{1b07ae3fe0e149929ac4443e99dfbe9c,
title = "Engineering flat sheet microporous PVDF films for membrane distillation",
abstract = "A simple phase inversion technique to fabricate hydrophobic microporous films for membrane distillation (MD) is presented. Polyvinylidene fluoride (PVDF) dissolved in triethyl phosphate (TEP) was used as a casting solution with a coagulation bath comprising 2-propanol and water. The effect of processing parameters (PVDF concentration and molecular weight, and composition of coagulation bath) on membrane performance was systematically investigated. Our results demonstrate that an MD membrane with desirable properties can be achieved by carefully controlling the casting parameters. The fabricated membranes exhibited asymmetric structure with a dense top layer and highly porous bottom substrate, and showed markedly different performance (i.e., water vapor flux) depending on the MD membrane orientation. Our results suggest that membrane surface porosity as well as the structure of the membrane are the key factors determining MD membrane performance.",
keywords = "Hydrophobicity, Membrane distillation, Phase inversion, Polyvinylidene fluoride, Surface porosity",
author = "Siamak Nejati and Chanhee Boo and Osuji, {Chinedum O.} and Menachem Elimelech",
year = "2015",
month = "10",
day = "5",
doi = "10.1016/j.memsci.2015.05.033",
language = "English (US)",
volume = "492",
pages = "355--363",
journal = "Jornal of Membrane Science",
issn = "0376-7388",
publisher = "Elsevier",

}

TY - JOUR

T1 - Engineering flat sheet microporous PVDF films for membrane distillation

AU - Nejati, Siamak

AU - Boo, Chanhee

AU - Osuji, Chinedum O.

AU - Elimelech, Menachem

PY - 2015/10/5

Y1 - 2015/10/5

N2 - A simple phase inversion technique to fabricate hydrophobic microporous films for membrane distillation (MD) is presented. Polyvinylidene fluoride (PVDF) dissolved in triethyl phosphate (TEP) was used as a casting solution with a coagulation bath comprising 2-propanol and water. The effect of processing parameters (PVDF concentration and molecular weight, and composition of coagulation bath) on membrane performance was systematically investigated. Our results demonstrate that an MD membrane with desirable properties can be achieved by carefully controlling the casting parameters. The fabricated membranes exhibited asymmetric structure with a dense top layer and highly porous bottom substrate, and showed markedly different performance (i.e., water vapor flux) depending on the MD membrane orientation. Our results suggest that membrane surface porosity as well as the structure of the membrane are the key factors determining MD membrane performance.

AB - A simple phase inversion technique to fabricate hydrophobic microporous films for membrane distillation (MD) is presented. Polyvinylidene fluoride (PVDF) dissolved in triethyl phosphate (TEP) was used as a casting solution with a coagulation bath comprising 2-propanol and water. The effect of processing parameters (PVDF concentration and molecular weight, and composition of coagulation bath) on membrane performance was systematically investigated. Our results demonstrate that an MD membrane with desirable properties can be achieved by carefully controlling the casting parameters. The fabricated membranes exhibited asymmetric structure with a dense top layer and highly porous bottom substrate, and showed markedly different performance (i.e., water vapor flux) depending on the MD membrane orientation. Our results suggest that membrane surface porosity as well as the structure of the membrane are the key factors determining MD membrane performance.

KW - Hydrophobicity

KW - Membrane distillation

KW - Phase inversion

KW - Polyvinylidene fluoride

KW - Surface porosity

UR - http://www.scopus.com/inward/record.url?scp=84935010284&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84935010284&partnerID=8YFLogxK

U2 - 10.1016/j.memsci.2015.05.033

DO - 10.1016/j.memsci.2015.05.033

M3 - Article

VL - 492

SP - 355

EP - 363

JO - Jornal of Membrane Science

JF - Jornal of Membrane Science

SN - 0376-7388

ER -