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

• Main Authors: Mahmoud FEIZ, Hossein Norouzi
• Format: Article
• Language: English
• Published: Kaunas University of Technology 2015-03-01
• Series: Medžiagotyra
• Subjects: wool, madder, dyeing, color strength, natural dye
• Online Access: http://matsc.ktu.lt/index.php/MatSc/article/view/5150
• ISSN: 1392-1320; 2029-7289

<span style="font-family: Times New Roman; font-size: small;"> </span><p class="MsoNormal" style="margin: 0in 0.35in 0pt 27pt; text-align: justify; mso-layout-grid-align: none;"><span style="font-size: 9pt; mso-ansi-language: EN-US;"><span style="font-family: Times New Roman;">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 (<em>C_f</em>= <em>k.C_s^α</em>) 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.</span></span></p><span style="font-family: Times New Roman; font-size: small;"> </span><p>DOI: <a href="http://dx.doi.org/10.5755/j01.ms.21.1.5150">http://dx.doi.org/10.5755/j01.ms.21.1.5150</a></p>