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ABSTRACT
Cotton fiber is a very rich natural polysaccharide material in nature, which is usually dyed with reactive dyes. However, a large number of salts remain in the dye bath waste, polluting the ecological environment. In this study, the salt-free dyeing of cationic dyes on carboxymethyl cotton fabric modified with sodium chloroacetate was carried out under the conditions of pH 7, initial dye concentration 0.5–10% owf, and liquor ratio 1:100. The results demonstrated that the cationic dyes were successfully adsorbed on the modified cotton fabric in the absence of salt, but the dyeing fastness was low. Furthermore, the adsorption thermodynamics and kinetics were investigated. The adsorption kinetics was found to follow the pseudo-second-order kinetic model, and the adsorption isotherm obtained was identified to be the Langmuir type. These results will help us to realize the salt-free dyeing of carboxymethyl modified cotton fabric in the future.
摘要
棉纤维是自然界中一种非常丰富的天然多糖物质, 通常用活性染料染色。然而, 在印染废水中含有大量的盐类, 污染了生态环境。在本研究中, 在pH值为7, 初始染料浓度为对织物重的0.5–10%, 染液浴比为1:100的条件下, 对经氯乙酸钠改性的羧甲基棉织物采用阳离子染料进行无盐染色。结果表明, 在无盐的条件下, 阳离子染料成功地吸附到改性棉织物上, 但染色牢度较低。此外, 还对其吸附热力学和动力学进行了研究。吸附动力学符合准二级动力学模型, 所得的吸附等温线为Langmuir型。这些结果将有助于在未来我们实现羧甲基改性棉织物的无盐染色.