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Title: Layer-by-layer surface modification of polyethersulfone membranes using polyelectrolytes and AgCl/TiO2 xerogels
Authors: Kaner, Papatya
Johnson, Daniel J.
Şeker, Erol
Hilal, Nidal
Alsoy Altınkaya, Sacide
Keywords: Antifouling
Silver xerogel
Ultrafiltration membrane
Layer by layer assembly
Water treatment
Issue Date: Nov-2015
Publisher: Elsevier Ltd.
Source: Kaner, P., Johnson, D.J., Şeker, E., Hilal, N., and Alsoy Altınkaya, S. (2015). Layer-by-layer surface modification of polyethersulfone membranes using polyelectrolytes and AgCl/TiO2 xerogels. Journal of Membrane Science, doi:10.1016/j.memsci.2015.05.048
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 3000L/m2, 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/m2 h. Antibacterial activity tests showed that AgCl/TiO2-incorporated layers do not permit bacterial growth on the membrane surface.
ISSN: 0376-7388
Appears in Collections:Chemical Engineering / Kimya Mühendisliği
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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