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中文摘要: 以氮气低温等离子体对壳聚糖-聚丙烯腈复合纳滤膜进行表面改性。用接触角、扫描电镜、扫描探针显微镜、X射线光电子能谱观察膜表面的亲水性和形貌特征,分析膜表面化学组成;以γ-氨基丁酸为分离对象表征膜的纳滤性能。结果表明:经50 W、20 Pa的氮气等离子体作用2 min,壳聚糖膜表面的亲水性大幅改善,其接触角由102.0°下降至44.3°,平整度明显提升;膜表面中的C—C、C—O和酰胺基团均减少,而胺基和羰基相应增加;在 pH=6.15的水溶液中对w=1.0%的γ-氨基丁酸进行纳滤,液体通量由原来的1.12 L/(m2·h)提高至1.75 L/(m2·h),且对氨基酸的截留率从28%提升至83%。
Abstract:Low temperature N2 plasma treatment was applied onto the surface of chitosan-polyacrylonitrile composite nanofiltration membrane. The membrane surface hydrophilicity and morphology were measured by contact angle, scanning electron microscopy and scanning probe microscopy. Chemical composition on the membrane surface was detected by X-ray photoelectron spectroscopy. The membrane filtration performance was evaluated by γ-aminobutyric acid solution concentration. It was demonstrated that treatment of 50 W and 20 Pa N2 plasma for 2 min ultimately improved hydrophilicity of the chitosan membrane and decreased its contact angle from 102.0° to 44.3°, it improved the membrane levelness as well. Chemical bonds on the membrane surface such as C—C, C—O, N—CO were reduced and —NH2, CO were increased. The flux of w=1.0% γ-aminobutyric acid solution through the membrane was enhanced from 1.12 L/(m2·h) to 1.75 L/(m2·h), meanwhile, at pH=6.15, the rejection of amino acids was improved from 28% to 83%.
keywords: chitosan polyacrylonitrile composite nanofiltration membrane low temperature nitrogen plasma
文章编号: 中图分类号: 文献标志码:
基金项目:纤维材料改性国家重点实验室自主设立重大/重点研究课题(LZ0902)
作者 | 单位 | |
张茜1 | 东华大学 1.材料科学与工程学院; 2.纤维材料改性国家重点实验室,上海 201620 | zhqianqianzh@yahoo.com |
金晓懿1 | 东华大学 1.材料科学与工程学院; 2.纤维材料改性国家重点实验室,上海 201621 | |
沈新元1,2 | 东华大学 1.材料科学与工程学院; 2.纤维材料改性国家重点实验室,上海 201622 | shenxy@dhu.edu.cn |
引用本文:
张茜1,金晓懿1,沈新元1,2.氮气等离子体改性壳聚糖-聚丙烯腈复合纳滤膜[J].功能高分子学报,2014,27(2):.
ZHANG Xi1,JIN Xiao-yi1,SHEN Xin-yuan1,2.Chitosan-Polyacrylonitrile Composite Nanofiltration Membrane Modified with Nitrogen Plasma[J].Journal of Functional Polymers,2014,27(2):.
张茜1,金晓懿1,沈新元1,2.氮气等离子体改性壳聚糖-聚丙烯腈复合纳滤膜[J].功能高分子学报,2014,27(2):.
ZHANG Xi1,JIN Xiao-yi1,SHEN Xin-yuan1,2.Chitosan-Polyacrylonitrile Composite Nanofiltration Membrane Modified with Nitrogen Plasma[J].Journal of Functional Polymers,2014,27(2):.