Layer-by-layer surface modification of polyethersulfone membranes using polyelectrolytes and AgCl/TiO2 xerogels

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

Research output: Contribution to journalArticle

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/TiO2 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/TiO2-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/TiO2-incorporated layers. Silver loss per filtration cycle followed an increasing trend initially, up to a filtration volume totaling 3000 L/m2, leading to 4.2% reduction in the immobilized silver amount. After that, silver loss per filtration cycle stabilized at ~7.44 μg/L, which extrapolates to ~265 days time-span for the remaining silver to be released at a filtration rate of ~1000 L/m2 h. Antibacterial activity tests showed that AgCl/TiO2-incorporated layers do not permit bacterial growth on the membrane surface.

Original languageEnglish (US)
Pages (from-to)807-819
Number of pages13
JournalJournal of Membrane Science
Volume493
DOIs
StatePublished - Nov 1 2015

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

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

Cite this

Layer-by-layer surface modification of polyethersulfone membranes using polyelectrolytes and AgCl/TiO2 xerogels. / Kaner, Papatya; Johnson, Daniel J.; Seker, Erol; Hilal, Nidal; Altinkaya, Sacide Alsoy.

In: Journal of Membrane Science, Vol. 493, 01.11.2015, p. 807-819.

Research output: Contribution to journalArticle

Kaner, Papatya ; Johnson, Daniel J. ; Seker, Erol ; Hilal, Nidal ; Altinkaya, Sacide Alsoy. / Layer-by-layer surface modification of polyethersulfone membranes using polyelectrolytes and AgCl/TiO2 xerogels. In: Journal of Membrane Science. 2015 ; Vol. 493. pp. 807-819.
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