Polyimide-graphene oxide nanofiltration membrane: Characterizations and application in enhanced high concentration salt removal

Nadiah Khairul Zaman, Rosiah Rohani, Abdul Wahab Mohammad, Arun Mohan Isloor

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

A membrane usually suffers from a reduction in membrane rejection performance when exposed to a concentrated salt solution. A fabricated polyimide (PI)/graphene oxide (GO) mixed matrix membrane (MMM) was prepared at different GO/PI concentrations (ranging from 0 to 3.5 wt%) to investigate membrane performance in diluted and concentrated salt solutions. Results showed that the MMM possess nanofiltration (NF) properties with high water permeability and excellent salt rejection (99%) in diluted conditions regardless of the applied filtration pressure. The water and permeate permeability increased with the increase in GO content. Interestingly, for concentrated salt solutions, PI/GO MMM only showed at most 4% reduction in rejection, unlike in pure PI membrane, which experienced 16% reduction. A higher amorphous region of the MMM compared to the pure PI in salt solutions was found through XRD. The ionization of GO increases the amorphous structure thus enhances the effective thickness of membrane maintaining the MMM rejection performance. 0.9 wt% GO/PI in MMM showed the highest rejection (98%) in 0.15 M Na2SO4. The presence of GO with its unique properties and highly porous structure was found to retain the membrane rejection properties, especially in concentrated solution.

Original languageEnglish
Pages (from-to)218-233
Number of pages16
JournalChemical Engineering Science
Volume177
DOIs
Publication statusPublished - 23 Feb 2018

Fingerprint

Salt removal
Nanofiltration membranes
Graphite
Polyimides
Oxides
Graphene
Membranes
Salts
Water
Ionization

Keywords

  • Desalination
  • Graphene oxide
  • Mixed matrix membrane
  • Nanofiltration
  • Polyimide

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Cite this

Polyimide-graphene oxide nanofiltration membrane : Characterizations and application in enhanced high concentration salt removal. / Zaman, Nadiah Khairul; Rohani, Rosiah; Mohammad, Abdul Wahab; Isloor, Arun Mohan.

In: Chemical Engineering Science, Vol. 177, 23.02.2018, p. 218-233.

Research output: Contribution to journalArticle

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