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The sorption and desorption of a reactive dye − Black 5, commonly used in the textile industry, from aqueous solutions onto chitin and chitosan was studied. Following the adsorption of the dye at pH 3, its desorption was carried out at pH 11. Equilibrium isotherms were analysed using the following isotherms: the Freundlich, the Langmuir, the two-site Langmuir and the three-parameter Redlich-Peterson...
Adsorption of reactive dyes and surfactants onto chitin from mixtures containing surfactants at constant concentration and dyes at variable concentration was investigated in the present study. Two vinylsulfonate dyes (Scarlet R, Brillantorange 3R); chlorotriazine dye (Black DN); anionic (Borutosol KRN, Siarczanol N-2) and non-ionic (Rokafenol N-8) surfactants were tested. The experiments were carried...
The adsorption of reactive dye mixtures onto chitin modified with 5N KOH was investigated. Three binary mixtures were tested. Each mixture contained Blue D-5RN and either Yellow D-5GN, or Red D-8B or Black DN as the second dye. The tests were conducted without pH adjustment and after pH adjustment to 3.0. The results were based on the constants determined from double Langmuir isotherm. The maximum...
The efficiency of reactive dyes adsorption onto chitin under dynamic conditions was determined. The research was carried out in an air-lift reactor. A reactive dye with chlorotriazine moiety - Black DN was reactor. A reactive dye with chlorotriazine moiety - Black DN was used. The effect of inlet Black DN concentration, chitin concentration in the reactor and flow rate on the maximum adsorption capacity...
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