Journal
CHEMICAL ENGINEERING JOURNAL
Volume 234, Issue -, Pages 132-139Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2013.08.085
Keywords
Nanofiltration; Amphoteric; Sulfated chitosan; Hexamethylene diisocyanate; Rejection performance
Categories
Funding
- National Centre Excellence in Desalination, Australia (NCEDA) [23634]
- ECU Innovator Awards [23641]
- Visiting Research Fellow Grant Scheme from Faculty of Health, Engineering and Science at Edith Cowan University
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A novel kind of amphoteric composite nanofiltration (NF) membranes were prepared via the method of coating and crosslinking, using an amphoteric derivative of chitosan, i.e. sulfated chitosan (SCS), as the active layer material, poly (acrylonitrile) (PAN) ultrafiltration (UF) membrane and hexamethylene diisocyanate (HDI) as the support membrane and crosslinker, respectively. The chemical structure of the resultant membrane was characterized with attenuated total reflection infrared spectroscopy (ATR-IR), revealing the reaction of hydroxyl groups and amino groups with HDI. The rejection properties of the developed composite membranes could be adjusted by changing the composition of the casting solution of the active layer and the preparing technique. The rejection performance to salt was dependent on the pH value of the feed solutions, and reached the minimum as the pH value of feed solution was equal to the isoeletric point (pI) of SCS. The rejection to different inorganic salts decreased in the order of K2SO4, Na2SO4, MgSO4, KCl, NaCl, and MgCl2. (C) 2013 Elsevier B.V. All rights reserved.
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