J. Lebek et W. Wardas, ADSORPTION OF SOME TEXTILE DYES ON POST-VANILLIN LIGNIN DURING ITS PRECIPITATION, Cellulose Chemistry and Technology, 30(3-4), 1996, pp. 213-221
The here investigated adsorption of some textile dyes on post-vanillin
lignin (lignin V) was examined during precipitation of the lignin, Un
der these conditions, not only the investigated cationic dyes adsorbed
, but also the reactive ones, of anionic character. The cationic dyes
adsorbed in all cases better than the reactive ones. Depending on the
type of dye and equilibrium concentration, the obtained excessive adso
rption reached values even up to 1.4 g per 1 g of lignin V, what made
adsorb even up to 99.6% of the amount introduced to a sample dye. The
determined adsorption isotherms were described with Langmuir' and Freu
ndlich's equations with a close to 100% probability. Both in the case
of the reactive dyes, which is obvious because of their anionic charac
ter, and in the case of the cationic ones, the investigated adsorption
process was of physical type.