Journal article
Spray assembled, cross-linked polyelectrolyte multilayer membranes for salt removal
KL Cho, H Lomas, AJ Hill, F Caruso, SE Kentish
Langmuir | Published : 2014
DOI: 10.1021/la501855k
Abstract
The present study reports the synthesis of spray-coated cross-linked polyelectrolyte multilayer membranes. Membrane cross-linking was performed using alkyne-azide "click" chemistry, where alkyne and azide functional groups were used to modify the poly(acrylic acid) (PAA) and the poly(allylamine) hydrochloride (PAH) polyelectrolytes. The results demonstrate that deposition at lower ionic strength produced smoother and denser membrane structures. Pore size analysis using neutral poly(ethylene glycol) revealed a decrease in the membrane pore size as the degree of cross-linking was increased, resulting in the membrane rejecting divalent CaCl2 at levels of up to 80%, and 50% rejection of monovale..
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Funding Acknowledgements
Dr. George Q., Chen is thanked for his assistance in the determination of the concentration polarization mass transfer coefficient. The authors acknowledge support from CSIRO under the Science and Industry Endowment Fund. K.L.C. and H.L. are recipients of a John Stocker Postdoctoral Fellowship from the Science and Industry Endowment Fund. The authors also thank G.E. Water for providing the polysulfone membrane substrates used in this work.