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Preparation and characterization of glutaraldehyde crosslinked chitosan nanofiltration membrane
Author(s) -
Zhang Xi,
Jin Xiaoyi,
Xu Chenyan,
Shen Xinyuan
Publication year - 2012
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.38580
Subject(s) - glutaraldehyde , membrane , amine gas treating , polyacrylonitrile , chemistry , chitosan , isoelectric point , hydrochloric acid , ultrafiltration (renal) , polymer chemistry , nuclear chemistry , organic chemistry , chromatography , polymer , biochemistry , enzyme
In this article, we prepare chitosan (CS) membrane on polyacrylonitrile (PAN) ultrafiltration membrane, and utilize the protonated amine group (NH 3 + ) on the CS to retain γ‐aminobutyric acid (GABA) in a solution with a pH condition below the amino acid isoelectric point, so as to separate the amino acid from a mixture with sodium acetate that simulates the amino acid fermentation broth. To improve the acid resistance of the composite membrane, we chelate the amine groups on the CS by copper sulfate first, then crosslink the hydroxyl groups in glutaraldehyde solution, and remove the copper ion in hydrochloric acid finally to release the amine groups. This crosslinked CS/PAN composite membrane achieves 95% GABA rejection in pH 4.69 solution under the operation pressure of 0.2 MPa, while over 90% of the sodium acetate permeates the membrane. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013