The results of the research on the ability of adsorption of dye on polyester fibers at atemperature of 98 °C are presented in this paper. The fibers were previously modified inaqueous solutions of NaOH, KOH or Al(OH)3. Typically, the dyeing of the fibers takesplace at high temperatures and under pressure in the presence of the carrier. Previousprocessing before adsorption-dyeing, alkali hydrolysis, changes the surface morphologyof polyester fibers. Based on dye exhaustion results, it was found that the dye adsorptionon modified polyester fibers (degree of exhaustion 18.2 %, for a dye concentration of 200mg?dm-3 and adsorption time of 5 min) has been bigger than adsorption to unmodifiedfibers (degree of exhaustion 10 %, for a dye concentration of 200 mg?dm-3 and adsorptiontime of 5 min). The five-parameter nonlinear model of Fritz-Schlunder is the most efficient in simulating isothermal adsorption of disperse dye on polyester fibers (the correlation coefficient is 0.995). Other adsorption models, Dubinin-Radushkevich, Marczewski-Jaroniec and Hill give poorer results and cannot be used to explain the adsorption ofthe disperse dye for polyester fibers (the correlation coefficients are 0.891, 0.922 and0.973, respectively).
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