Investigation of Adsorption Process and Thermodynamics of Cochineal Dye on Wool

Adsorption of cochineal dyeing on wool and its thermodynamic were investigated under dyeing conditions of pH = 3, a material to liquor ratio （MLR） of 1：50, and a contact time of 90 min. The data of adsorption equilibria were analyzed by using various adsorption isotherm models. The results show that...

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Bibliographic Details
Published in:材料科学与工程：中英文B版 2011, Vol.1 (3), p.388-393
Main Author: Mohsen Oftadeh Nafice Makkei Mahnaz Khosravi Farsani
Format: Article
Language:Chinese
Subjects:
Freundlich模型
Langmuir
吸附过程
染料
热力学
等温线模型
羊毛
胭脂
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Summary:Adsorption of cochineal dyeing on wool and its thermodynamic were investigated under dyeing conditions of pH = 3, a material to liquor ratio （MLR） of 1：50, and a contact time of 90 min. The data of adsorption equilibria were analyzed by using various adsorption isotherm models. The results show that adsorption behavior of the dye could be described reasonably well by either Langmuir or Freundlich models, with a high correlation coefficient （R2）. The values for heat of dyeing and entropy of dyeing were determined ＋18.03 kJ and ＋66 J/K, respectively. The positive values of △H3 indicate an endothermic adsorption process. The negative values of AG＋3 show spontaneous nature of adsorption process and the positive values of AS＋3 indicate the affinity of the adsorption for dyes.
ISSN:2161-6221