Research
Natural Dyeing of Silk with Eucalyptus Leaves Extract
This study aimed to evaluate the process of silk dyeing with the extract of eucalyptus leaves. pH, temperature, initial extract concentration was investigated. The initial extract concentration of 20 g L1 , pH 3 and temperature of 90 °C were the conditions which yielded the best results from dyeing. The pseudo-second order model was the one that best represented the kinetic mechanism of dyeing, indicating that chemisorption was the main mechanism involved. The equilibrium data were adjusted to the Langmuir-Freundlich model indicating significant contribution from the chemisorption process. Dyeing with the extract of eucalyptus leaves is a spontaneous and endothermic process with a high degree of disorder. The notes washing fastness of dyed fabrics were 3-4 for the color change and 4 for staining on cotton and wool.
