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2020, vol. 9, br. 2, str. 41-47
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Termodinamička razmatranja sorpcije disperzne boje na poliestarska vlakna
Thermodynamic investigation of disperse dyes sorption on polyester fibers
aUniverzitet u Nišu, Srbija bUniversity of Tetovo, Faculty of Natural Sciences and Mathematics, Tetovo, North Macedonia cUniverzitet u Nišu, Tehnološki fakultet, Leskovac, Srbija dUniversity of Zagreb, Faculty of Textile Technology, Zagreb, Croatia
e-adresa: izida50@gmail.com
Projekat: The funds for the realization of this scientific work were provided by the Ministry of Education. Science and Technological Development of the Republic of Serbia.
Sažetak
U članku je predstavljena analiza termodinamike sorpcije tokom procesa bojenja sirovih poliestarskih vlakana disperznom bojom. Bojenje vlakana je izvršeno dis-kontinualno, šaržni proces, prema standardnoj proceduri uz variranje početne kon-centracija boje i temperature bojenja. Korišćeno je nekoliko usvojenih modela za izračunavanje termodinamičkih parametara kojima se definiše i pojašnjava proces sorpcije disperzne boje na poliestarsko vlakno. Utvrđena je visoka funkcionalnost promenljivih za izračunavanje osnovnih termodinamičkih parametara, čime je potvrđena validnost rezultata. Zavisno od načina izračunavanja, promena slobodne energije tokom bojenja poliestra, bila je negativna (-10 --40 kJ·mol -1), što odgovara spontanom i uglavnom fizičkom procesu sorpcije. Pozitivna vrednost za promenu entalpije tokom bojenja (1.1×10 -2 -2.9 ×10 1 kJ·mol -1), odražava endotermnu prirodu interakcija, a relativno manja brojčana vrednost karakteriše fenomen fizisorpcije. Pozitivna vrednost za promenu entropije (1.1×10 -4 -1.5 ×10 -1 kJ·mol -1 ·K -1) potvrđuje se da je u pitanju fizička sorpcija.
Abstract
The thermodynamics of sorption during the dyeing process of raw polyester fibers with disperse dye was studied in this article. Dyeing of fibers is carried out by a discontinuous batch process, according to standard procedures with varying of the initial dye concentration and the dyeing temperature. Several of the accepted models for calculation of thermodynamic parameters were used which define and clarify the sorption of disperse dyes on polyester fibers. High functionality of variables for the calculation of basic thermodynamic parameters was determined, which confirmed the validity of the results. Depending on the method of calculation , the change of free energy during the dyeing of the polyester was negative (-10-40 kJ·mol-1), which corresponds to the spontaneous and mainly the physical process of sorption. A positive value for the change in enthalpy during dyeing (1.1×10-2-2.9×10 1 kJ·mol-1) reflects the endothermic nature of the interactions, and a relatively lower value characterizes the physisorption phenomenon. A positive value for the change in entropy (1.1×10-4-1.5×10-1 kJ·mol-1 ·K-1) confirms that it is a physical sorption.
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