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Effect of Ethyl Xanthogenate on the Absorption of a Cationic Dye on Polyester Fibers: Zeta Potential and Sorption Thermodynamics

机译:黄原酸乙酯对聚酯纤维上阳离子染料吸收的影响:Zeta势和吸附热力学

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摘要

Data are presented for the zeta potential, kinetics, and sorption thermodynamics of CI Brilliant Green on both untreated polyester fibers and polyester pretreated with constant amounts of potassium ethyl xanthogenate at different temperatures. The rising temperature of the system increases dye absorption on untreated polyester, and the rising temperature of absorption increases dye uptake on pretreated polyester. Cationic dye absorption is enhanced by increasing amounts of ethyl xanthogenate taken up by the fibers during pretreatment. The negative zeta potential of pretreated polyester rises when the amount of ethyl xanthogenate in the pretreatment is increased at low concentrations of dye solution. The zeta potential sign changes at high concentrations of cationic dye in the liquid phase. When the amount of ethyl xanthogenate in the pretreatment increases, there is a displacement of this sign inversion toward lesser concentrations. Absorption equilibria, empirical rate constants, activation energy, standard affinity, and enthalpy and entropy of reaction are determined for cationic dye absorption on untreated and pretreated polyester. The results and the molecular structure of the dye and ethyl xanthogenate suggest that the absorption of CI Brilliant Green on the pretreated polyester probably takes place by means of an electrostatic attraction between the dye cation and the negatively charged —S~- groups of the ethyl xanthogenate.
机译:数据显示了CI Brilliant Green在未处理的聚酯纤维和在不同温度下用恒定量的乙基黄原酸钾预处理的聚酯上的ζ电位,动力学和吸附热力学。系统的温度升高会增加未处理的聚酯上的染料吸收,而吸收温度的升高会增加预处理的聚酯上的染料吸收。通过增加纤维在预处理过程中吸收的黄原酸乙酯的量,可以增强阳离子染料的吸收。当在低浓度的染料溶液中增加预处理中黄原酸乙酯的量时,预处理的聚酯的负zeta电位会升高。在液相中高浓度的阳离子染料时,ζ电位符号会发生变化。当预处理中的黄原酸乙酯的量增加时,该符号反转向较小的浓度位移。测定在未处理和预处理的聚酯上的阳离子染料吸收的吸收平衡,经验速率常数,活化能,标准亲和力以及反应的焓和熵。结果和染料及黄原酸乙酯的分子结构表明,CI艳绿在预处理的聚酯上的吸收可能是通过染料阳离子与黄原酸乙酯的带负电荷的-S〜-基团之间的静电吸引而发生的。 。

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