Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 428, Issue -, Pages 225-231Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2012.10.011
Keywords
Pressure retarded osmosis; Thin film composite; Membrane preparation; Hydrophilic support; Cellulose acetate
Categories
Funding
- Norwegian Research Council
- Statkraft
- Statoil
- Aqualyng
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The interest in osmotically driven processes such as pressure retarded osmosis (PRO) has increased during the past decade. The synthesis of new membranes specifically designed for the process is essential for the development of these technologies. Conventional TFC have a relatively hydrophobic support layer e.g., polysulfone. However, a more hydrophilic support layer is desirable in osmotically driven processes as such supports would give better water flux, less internal concentration polarization (ICP) and less fouling. In the current project it was demonstrated that it is possible to coat a hydrophilic support membrane given there are enough functional/reactive groups on the surface of the support membrane. This is achieved by reacting the support with polyfunctional acid chlorides in a reaction step prior to interfacial polymerization (IP). In this way, covalent bonds between the support and the active layer are formed and the composite will be stabilized. Hydrolysed cellulose acetate CA membranes have been coated with a polyamide (PA) layer by this modified IP method. These membranes displayed a salt rejection up to 97%, and water fluxes from 7.6 x 10(-7) to 4.7 x 10(-6) m(3)/m(2)/s at 1.3 x 10(6) Pa differential pressures. (C) 2012 Elsevier B.V. All rights reserved.
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