DIBENZO-18-CROWN-6/POLYCAPROLACTONE COMPOSITE NANOFIBERS FOR SELECTIVE ADSORPTION OF CATIONS

Authors : Özlem İpek KALAOĞLU ALTAN
Pages : 53-66
Doi:10.17482/uumfd.1222084
View : 35 | Download : 9
Publication Date : 2023-04-30
Article Type : Research Paper
Abstract :Electrospun nanofibers are attractive alternatives to traditional adsorbents due to their high surface-to-volume ratio, porosity, and loading capacity. Functionalization of nanofibers with macrocycles can contribute to further enhancement in selective adsorption of ions. In this study, polycaprolactone insert ignore into journalissuearticles values(PCL); nanofibers were functionalized with a crown ether, namely dibenzo-18-crown-6 insert ignore into journalissuearticles values(DB18C6);, and the potential of the resultant electrospun PCL/DB18C6 nanofibers for selective ion adsorption, particularly the selective recovery for K+, was investigated. The morphology, chemical structure and thermal properties of PCL/DB18C6 nanofibers were characterized by scanning electron microscope insert ignore into journalissuearticles values(SEM);, Fourier transform infrared spectroscopy insert ignore into journalissuearticles values(FTIR);, X-ray photoelectron spectroscopy insert ignore into journalissuearticles values(XPS);, thermal gravimetric analysis insert ignore into journalissuearticles values(TGA); and differential scanning calorimetry insert ignore into journalissuearticles values(DSC);. The average diameter of PCL/DB18C6 nanofibers was 529±196 nm. Single-ion adsorption experiments indicated that the adsorption capacity for K+ ion was 137 mg·g−1 and the selectivity sequence was found as K+>Ca2+>Na+. The adsorption selectivity coefficients of K+/Ca2+ and K+/Na+ were calculated respectively as 1.37 and 4.28 for single ion experiments and as 1.13 and 5.11 for mixed ion adsorptions which illustrate that the difference between the adsorption capacities of K+ and Ca2+ decreased in mixed ion adsorption experiments. Overall results demonstrate that the electrospun PCL/DB18C6 nanofibers are amenable for use as polymer adsorbents for the selective ion recovery.
Keywords : Elektroeğirme, Nanolif, Dibenzo 18 taç 6, Polikaprolakton, Adsorban

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