Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 534, Issue -, Pages 46-58Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2017.04.008
Keywords
Second interfacial polymerization; Thin-film composite membrane; Forward osmosis; Polyethyleneimine; Post-treatment
Categories
Funding
- National Natural Science Foundation of China [21306058]
- Free Exploring Fundamental Research Project from Shenzhen Research Council, China [JCYJ20160408173516757]
- Open Research Fund Program of Collaborative Innovation Center of Membrane Separation and Water Treatment of Zhejiang Province [2016YB03]
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In this work, simple and effective second interfacial polymerization (SIP) of thin-film composite (TFC) membranes is performed with polyethyleneimine (PEI) of various molecular weights, in order to improve the separation performance for forward osmosis (FO) applications. Various characterization techniques are employed to examine the modification mechanism. Compared to the control TFC membrane, PEI-modified membranes exhibit higher water permeabilities, acceptable salt rejection and lower fouling propensity. The effects of PEI molecular weight on the membrane morphology and separation performance are investigated systematically with various characterizations. Post-treatment of PEI-modified membranes in alkaline and acidic aqueous solutions is further investigated, and its effects on the FO performance, intrinsic separation properties and antifouling properties of these post-treated membranes are studied. In comparison with pristine PEI-modified TFC membranes, the post-treated TFC membranes show further enhanced water flux and improved anti-fouling properties.
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