期刊
JOURNAL OF MEMBRANE SCIENCE
卷 370, 期 1-2, 页码 116-123出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2011.01.001
关键词
Surface modification; Chlorination; Chitosan; Polyamide; Reverse osmosis
资金
- New Teachers Fund [20090132120007]
In this study, a novel process to modify thin-film-composite polyamide membrane was developed. It involved surface treatment of the polyamide membrane by chlorine, followed by supramolecular assembly of chitosan on the membrane surface. While the original polyamide membrane was negatively charged, the surface modification led to a charge reversal due to skin layer of chitosanium in the resulting polyamide/chitosan composite membrane. The polyamide/chitosan (PA/CS) composite membrane was shown to perform better than the original polyamide membrane. The parameters involved in the chlorination of polyamide (e.g., chlorination time and chlorine concentration) and supramolecular assembly of chitosan (e.g., concentration and deposition time) on the membrane surface were investigated. The following conditions for membrane modification were found to be appropriate: NaClO concentration 200 mg/L, chlorination time 2-5 min, and chitosan concentration 1000 mg/L; the PA/CS membrane so formed exhibited a permeation flux of 57.7 L/(m(2) h) and a salt rejection of 95.4% for a feed NaCl concentration of 1500 mg/L at 0.8 MPa. The PA/CS composite membrane also exhibited good performance for rejection of divalent salts (99.8% for MgCl2 and 98.5% for Na2SO4) at the same concentration. This modification technique is simple and practical because dilute solutions are used for surface treatment and commercial membrane units can be modified in their original modules. (C) 2011 Elsevier B.V. All rights reserved.
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