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Dyeing equilibria: interaction of direct dyes with cellulose substrates
Author(s) -
Porter John J
Publication year - 2002
Publication title -
coloration technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 1472-3581
DOI - 10.1111/j.1478-4408.2002.tb00106.x
Subject(s) - sorption , langmuir , freundlich equation , chemistry , cellulose , dyeing , substrate (aquarium) , langmuir equation , chemical engineering , organic chemistry , adsorption , geology , oceanography , engineering
The traditional Freundlich equation used to correlate direct dye sorption on cellulose is compared to the Langmuir equation for correlating the same data. Results taken from six different direct dyes are presented that show a much better correlation of the data is obtained with the Langmuir equation indicating that the interaction of dyes with the substrate is rather specific. The specific nature of the sorption process is compared to acid dye sorption on aminised cotton which also is shown to be Langmuir type. Explanation of the sorption of mixtures of direct dyes is also discussed as being better interpreted in terms of the Langmuir sorption.