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Immobilization of residual dyes onto ion-exchanger cellulosic materials

机译:将残留染料固定在离子交换纤维素材料上

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This article reports on the preparation of cationized cotton fiber by treating alkali cellulose cotton fibers with epoxy propyltrimethylammonium chloride (EPTMAC) in a nonaqueous medium and its use as support for the immobilization of pollutant dyes. Evidence of attaching quaternary ammonium groups onto cellulose is provided by IR analysis, nitrogen determination, and weight uptake. Four EPTMAC-Cotton fiber samples with different nitrogen content (0.5-1.85) are tested for the adsorption of four acid dyes (Acid Blue 25, Acid Yellow 99, Reactive Yellow 23, and Acid Blue 74). Adsorption is followed spectrometrically, the capacity of adsorption depending on the nitrogen content; and on the number of anionic groups in the dye. The Langmuir and Freundlich isotherms constants are evaluated from the experimental data, but better agreement is obtained by using a composite isotherm of the general form Y-e = iC(e)/(1 + jC(e)(m)), where i, j, and m are constants. (C) 2000 John Wiley & Sons, Inc. [References: 52]
机译:本文报道了通过在非水介质中用环氧丙基三甲基氯化铵(EPTMAC)处理碱性纤维素棉纤维来制备阳离子棉纤维的方法,并将其用作固定污染染料的载体。通过IR分析,氮测定和重量吸收提供了将季铵基团连接到纤维素上的证据。测试了四个氮含量不同(0.5-1.85)的EPTMAC-棉纤维样品对四种酸性染料(酸性蓝25,酸性黄99,活性黄23和酸性蓝74)的吸附。分光光度地跟踪吸附,吸附能力取决于氮含量;以及染料中阴离子基团的数目。 Langmuir和Freundlich等温线常数是根据实验数据估算的,但通过使用一般形式为Ye = iC(e)/(1 + jC(e)(m))的复合等温线可以获得更好的一致性,其中i,j ,和m是常数。 (C)2000 John Wiley&Sons,Inc. [参考:52]

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