Dyeing and Adsorption Studies of Madder (Rubia tinctorum) on Wool Fibers

  • Mahmoud FEIZ Isfahan university of technology
  • Hossein Norouzi IUT
Keywords: wool, madder, dyeing, color strength, natural dye


In this study, the dyeing behavior of wool fabrics with madder has been studied. Three well-known types of adsorption isotherms i.e. the Nernst, Freundlich and Langmuir isotherms were used to fit the data. It was found that the adsorption isotherm of madder on wool fibers follows Freundlich type of adsorption. The exponent α in Freundlich isotherm equation (Cf = k.Csα) was obtained 0.61 corresponding to 0.5 for the direct dyes on cellulosic fibers. The effect of salt and pH on dyeing of wool samples was investigated by the use of color characteristics measurements. The results showed that addition of salt and acid (pH 4.5) to the dyebath resulted in an increase of adsorption.

DOI: http://dx.doi.org/10.5755/j01.ms.21.1.5150

Author Biographies

Mahmoud FEIZ, Isfahan university of technology
one of the best uninversity in iran
Hossein Norouzi, IUT
IUT is one of the best universities in IRAN.