Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 371, Issue 1-2, Pages 293-306Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2011.01.059
Keywords
Surface modification; Reverse osmosis; Polyamide thin-film composite membrane; N-isopropylacrylamide-co-acrylic acid copolymer; Membrane property
Categories
Funding
- National Nature Science Foundation of China (NNSFC) [20976167]
- Nature Science Foundation of Zhejiang Province [Y4080355]
- Science & Research Program of Zhejiang Province [2009C33069]
- Science Foundation of Zhejiang Sci-Tech University (ZSTU) [0713681]
- Zhejiang Sci-Tech University [YCX-S10016]
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Commercial thin-film composite aromatic polyamide reverse osmosis membranes were modified by depositing N-isopropylacrylamide-co-acrylic acid copolymers (P(NIPAm-co-AAc)) on the membrane surface, and the modified membranes showed improved membrane properties. P(NIPAm-co-AAc) copolymers were synthesized by free radical copolymerization and their aqueous solutions of different concentrations were used to modify the polyamide membranes through in situ surface coating technique. The deposition of P(NIPAm-co-AAc) layer was shown to increase membrane surface hydrophilicity and surface charge at neutral pH. but offer additional resistance to water permeation. The effect of surface modification on membrane salt permeability was investigated through permeation tests with different salts under different pHs. The membrane modification was found to decrease the salt permeability of NaCl and Na2SO4 under neutral and alkaline conditions, and the decrease was significant for Na2SO4 that has divalent anions than for NaCl that has monovalent anions. The results of the fouling experiments with bovine serum albumin (BSA) aqueous solution and washing experiments with de-ionized water of different temperatures also revealed that the P(NIPAm-co-AAc) coating layer improved the fouling resistance to BSA and the cleaning efficiency. The phase transition of the coating layer under temperatures above its LCST would facilitate the removal of foulants located on the membrane surface. (C) 2011 Elsevier B.V. All rights reserved.
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