期刊
JOURNAL OF MEMBRANE SCIENCE
卷 280, 期 1-2, 页码 478-484出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2006.02.003
关键词
N,O-carboxymethyl chitosan (NOCC); composite NF membranes; ATR-IR; rejection performance
N,O-carboxymethyl chitosan (NOCC) composite nanofiltration membranes having a polysulfone (PS) UF membrane as the substrate were prepared using a method of coating and cross-linking, in which a glutaraldehyde (GA) aqueous solution was used as the cross-linking agent. Attenuated total reflection infrared spectroscopy (ATR-IR) was employed to characterize the resulting membrane. The effects of the composition of the casting solution of the active layer, the concentration of the cross-linking agent, and the membrane preparation techniques on the performance of the composite membrane were investigated. At 13-15 degrees C and 0.40 MPa the rejections of the resulting membrane to Na2SO4 and NaCl solutions (1000 mg L-1) were 92.7 and 30.2%, respectively, and the permeate fluxes were 3.0 and 5.1 kg m(-2) h(-1), respectively. The rejection of this kind of membrane to the electrolyte solutions decreased in the order of Na2SO4, NaCl, MgSO4, and MgCl2. This suggests that the membrane active layer acquires a negative surface charge distribution by the adsorption of anions from the electrolyte solution and this charge distribution mainly determines the membrane performance. (c) 2006 Elsevier B.V. All rights reserved.
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