Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 525, Issue -, Pages 269-276Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2016.11.015
Keywords
Positive charge; Nanofiltration; Metal-organic frameworks (MOFs); Morphology; Chitosan
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Funding
- Innovation and Technology Fund [ITS/208/14]
- General Research Fund [17207514]
- Strategic Research Theme (Clean Energy) of the University of Hong Kong, Hong Kong
- Hong Kong Scholars Program [XJ2015015]
- National Natural Science Foundation of China, China [21406060]
- Shanghai Sailing Program [14YF1404800]
- Fundamental Research Funds for the Central Universities [WA1514305]
- Open Project of State Key Laboratory of Chemical Engineering [SKL-ChE-14C03]
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A novel positively charged nanofiltration (NF) membrane was fabricated by incorporating metal-organic frameworks (MOFs) into chitosan polymeric matrix for enhanced removal of multivalent cations. The synthesized MOFs, NH2-MIL--101(Al) and NH2-MIL-101(Cr), could be homogeneously dispersed in the chitosan polymeric matrix. The morphologies of MOFs had a significant influence on the permeability of NF membranes. NF membrane filled with NH2-MIL-101(Al) with rod-like structure attained two times higher flux but similar rejection compared with that filled with NH2-MIL-101(Cr) with grainy structure. The effect of MOF loadings (NH2-MIL-101(Al)) on the membrane performance were evaluated by XRD, FTIR and SEM. These positively charged MOF/chitosan NF membranes were able to reject up to 93.0% of MgCl2, and the salt rejection followed the order of MgCl2 > CaCl2 > NaCl > Na2SO4.
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