Apparent equilibrium sorption of indigo on cotton denim yam was determined at dyebath pH ranges of 13.1-13.3 and 11.1-11.3 under infinite bath conditions at 25°C. The equilibrium concentration of indigo on the cotton fiber is much higher for dyeings at the lower of the two pH ranges. The higher apparent affinity of the dye at the lower pH range is correlated with the mono-ionic form of indigo, and sorption is effectively described by the empirical Freundlich isotherm.
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References
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