o:2459 MODELING OF DISPERSE DYE ADSORPTION ON MODIFIED POLYESTER FIBERS en The results of the research on the ability of adsorption of dye on polyester fibers at a temperature of 98 °C are presented in this paper. The fibers were previously modified in aqueous solutions of NaOH, KOH or Al(OH)3. Typically, the dyeing of the fibers takes place at high temperatures and under pressure in the presence of the carrier. Previous processing before adsorption-dyeing, alkali hydrolysis, changes the surface morphology of polyester fibers. Based on dye exhaustion results, it was found that the dye adsorption on modified polyester fibers (degree of exhaustion 18.2 %, for a dye concentration of 200 mg⋅dm-3 and adsorption time of 5 min) has been bigger than adsorption to unmodified fibers (degree of exhaustion 10 %, for a dye concentration of 200 mg⋅dm-3 and adsorption time 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 of the disperse dye for polyester fibers (the correlation coefficients are 0.891, 0.922 and 0.973, respectively). Acta Periodica Technologica, APTEFF, 51, pp. 1-7 1552099 10.2298/APT2051001K 2024-03-17T20:37:44.846Z 44 yes 46 Marija Kodrić Innovation Center, University of Niš 0000-0002-7851-8921 2020 46 Dragan Đorđević University of Niš, Faculty of Technology 46 Sandra Konstantinović University of Niš, Faculty of Technology 46 Mirjana Kostić University of Belgrade, Faculty of Technology and Metallurgy 46 Tatjana Šarac Faculty of Technology, University of Niš application/pdf 354501 https://phaidrani.ni.ac.rs/o:2459 no yes 18 70 92000001 18A15