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Thermodynamics Study of Natural Indigo Adsorption on Silk Yarn


Paper Type 
 Short Communication
Title 
 Thermodynamics Study of Natural Indigo Adsorption on Silk Yarn
Author 
 Paisan Kongkachuichay, Aroonsiri Shitangkoon, and Sakowrath Hirunkitmonkon
Email 
 fengpsk@ku.ac.th
Abstract:
Leaves of  Indigofera tinctoria were fermented in water. During fermentation, indican in leaves decomposed completely to indoxyl and was consecutively oxidized to indigo that finally precipitated from the fermented solution.  The hybrid-race silk yarn was then dyed till equilibrium with obtained indigo reduced by Na2S2O4 under alkaline condition and thermodynamics of  dyeing process was investigated. The obtained adsorption isotherm was classified as a Langmuir type.  The apparent diffusion coefficients at 33, 40 and 50oC are 1.23x10-12, 8.26x10-13 and 4.26x10-13 m2s-1, respectively.  The heat of  adsorption and the change of  entropy are -9.43 kcalmol-1 and 0.023 kcalmol-1 K-1, respectively.  In addition, the saturated dye uptake was found to be decreased when the dyeing temperature was increased. The obtained results are useful for designing appropriate dyeing equipment and conditions for dyeing silk with natural indigo.
Start & End Page 
 363 - 367
Received Date 
 2010-01-14
Revised Date 
Accepted Date 
 2010-03-09
Full Text 
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Keyword 
 adsorption isotherm, natural indigo, silk dyeing, heat of adsorption, diffusion
Volume 
 Vol.37 No.2 (MAY 2010)
DOI 
Citation 
 Kongkachuichay P., Shitangkoon A., and Hirunkitmonkon S., Thermodynamics Study of Natural Indigo Adsorption on Silk Yarn, Chiang Mai Journal of Science, 2010; 37(2): 363-367.
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