Layer-by-layer surface modification of polyethersulfone membranes using polyelectrolytes and AgCl/TiO<inf>2</inf> xerogels

Papatya Kaner, Daniel J. Johnson, Erol Seker, Nidal Hilal, Sacide Alsoy Altinkaya

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

In this study, the layer-by-layer (LbL) assembly method was employed to modify a commercial polyethersulfone (PES) membrane by successive adsorption of chitosan and alginate as cationic and anionic polyelectrolytes. To enhance anti-biofouling property, pure, PEG mixed and PEGylated AgCl/TiO<inf>2</inf> xerogels were incorporated solely in the top layer of the LbL-modified membranes. Organic and biological foulings were addressed separately using alginate and Escherichia coli bacteria suspensions as the organic and biological model foulants, respectively. LbL-modifying the commercial PES membrane successively with chitosan and alginate polyelectrolyte multilayers prevented organic fouling extensively. In addition, we found that AgCl/TiO<inf>2</inf>-incorporated membranes show higher water permeability and improved resistance to biological fouling as compared to the PES membrane. Silver amounts in consecutively collected permeate samples were quantified by ICP-MS analysis to assess the stability of AgCl/TiO<inf>2</inf>-incorporated layers. Silver loss per filtration cycle followed an increasing trend initially, up to a filtration volume totaling 3000L/m<sup>2</sup>, leading to 4.2% reduction in the immobilized silver amount. After that, silver loss per filtration cycle stabilized at ~7.44μg/L, which extrapolates to ~265 days time-span for the remaining silver to be released at a filtration rate of ~1000L/m<sup>2</sup> h. Antibacterial activity tests showed that AgCl/TiO<inf>2</inf>-incorporated layers do not permit bacterial growth on the membrane surface.

Original languageEnglish
JournalJournal of Membrane Science
DOIs
Publication statusAccepted/In press - 12 Jan 2015
Externally publishedYes

Fingerprint

Xerogels
xerogels
Polyelectrolytes
Surface treatment
surface layers
Silver
membranes
Membranes
Alginate
Fouling
silver
fouling
Chitosan
Biofouling
Biological Models
Escherichia coli
Polyethylene glycols
Adsorption
bionics
polyether sulfone

Keywords

  • Antifouling
  • Layer by layer assembly
  • Silver xerogel
  • Ultrafiltration membrane
  • Water treatment

ASJC Scopus subject areas

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

Cite this

Layer-by-layer surface modification of polyethersulfone membranes using polyelectrolytes and AgCl/TiO<inf>2</inf> xerogels. / Kaner, Papatya; Johnson, Daniel J.; Seker, Erol; Hilal, Nidal; Altinkaya, Sacide Alsoy.

In: Journal of Membrane Science, 12.01.2015.

Research output: Contribution to journalArticle

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