Antipollution ultrafiltration membrane of amino acid grafting composite cellulose and preparation method thereof

一种氨基酸接枝复合纤维素的抗污染超滤膜及其制备方法

Abstract

The invention discloses an antipollution ultrafiltration membrane of amino acid grafting composite cellulose. An ultrafiltration membrane of sodium oxide nanocellulose composite cellulose acetate is adopted as a basic membrane and activated in a solution containing a carbonyl activating agent formed by a condensating agent and amide and is then grafted with amino acid to obtain the antipollution ultrafiltration membrane, the chemical general formula of the amino acid is NH2-R-CH(NH2)-COOH, wherein R is an alkyl chain. The preparation method comprises the steps: preparing a primary membrane casting solution; preparing a composite cellulose membrane casting solution; preparing a composite cellulose ultrafiltration membrane; activating: activating carbonyl functional groups in the sodium oxide nanocellulose; and grafting: washing the activated composite cellulose ultrafiltration membrane, and soaking in an amino acid solution to obtain the composite cellulose ultrafiltration membrane. The ultrafiltration membrane prepared by adopting the preparation method of the invention has the advantages of good compressive compactness, good antipollution effect, easiness for washing the membrane and the like; and the cellulose is wide in source, low in price, low in cost, wide in application field, easy to degrade and harmless to the environment.
本发明公开了一种氨基酸接枝复合纤维素的抗污染超滤膜,以氧化纳米纤维素复合醋酸纤维素的超滤膜为基膜,经含有缩合剂和酰胺形成羰基活化剂的溶液中活化,然后接枝氨基酸制备而成,所述氨基酸的化学通式为NH2?R?CH(NH2)?COOH,其中R为烷基链;其制备方法为:制备初级铸膜液;制备复合纤维素铸膜液;制备复合纤维素超滤膜;活化:将氧化纳米纤维中的羧基官能团进行活化;接枝:活化的复合纤维素超滤膜清洗后浸没在氨基酸溶液中反应,得到复合纤维素超滤膜。本发明制备方法,制备得到的超滤膜具有抗压密实性、抗污染效果好、膜清洗容易等优点;纤维素来源方法,价格低廉,成本低,应用领域广泛,而且易于降解,对环境无危害。

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Patent Citations (2)

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NO-Patent Citations (1)

    Title
    周建军等: "纳米纤维素晶/醋酸纤维素共混超滤膜材料的研究", 《材料导报》

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