A review on nanofiltration membrane fabrication and modification using polyelectrolytes: Effective ways to develop membrane selective barriers and rejection capability

Law Yong Ng, Abdul Wahab Mohammad, Ching Yin Ng

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

The performance of nanofiltration (NF) processes is mainly governed by factors such as the sieving effect (also known as size exclusion) and the Donnan effect (which depends on membrane surface charges). This has encouraged the development of new types of NF membranes using various kinds of polyelectrolytes as they have good pore-sealing effects and are able to improve the membrane surface charge density. Manipulation of the pH, supporting electrolyte concentration, type and concentration of polyelectrolyte solutions can significantly vary the characteristics of polyelectrolyte molecules thus improving their electrostatic interactions with the surrounding compounds. This is highly desired and useful when polyelectrolytes are to be incorporated in membrane surface modification as the charges formed can increase the membrane surface charge density, membrane surface coating stability and membrane selectivity. Most of the research discussed in this paper employed the special features of polyelectrolyte molecules to improve the performance of NF membranes in various applications. Various methods have been used to incorporate polyelectrolytes in order to improve NF membrane performance, such as static deposition, dynamic deposition, single layer coating, layer-by-layer (LbL) coating, and so forth. Some of the suitable devices or instruments used for polyelectrolyte-modified membranes are recommended and evaluated. In conclusion, polyelectrolytemodified membranes offer significant improvements, can be produced in a short period of time, require less energy during membrane modification or fabrication and incur lower production costs. Thus, a full understanding of the factors affecting polyelectrolyte-modified membranes is very much desired and worth further detailed investigation in the near future.

Original languageEnglish
Pages (from-to)85-107
Number of pages23
JournalAdvances in Colloid and Interface Science
Volume197-198
DOIs
Publication statusPublished - 2013

Fingerprint

Nanofiltration membranes
Polyelectrolytes
rejection
membranes
Membranes
Fabrication
fabrication
Surface charge
Charge density
Coatings
coatings
Nanofiltration
Molecules
Coulomb interactions
production costs
Electrolytes
Surface treatment
sealing
exclusion
molecules

Keywords

  • Membrane modification
  • Membrane rejection
  • Membrane selectivity
  • Nanofiltration
  • Polyelectrolyte

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry
  • Surfaces and Interfaces

Cite this

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