فهرست نشریات علمی دسترسی آزاد ایران

This study investigates the performance of chitosan-grafted poly(acrylic acid-co-2-(((1E,2E)-1,2-diphenyl-2-((4(E-1-(thiazole 2yl imino) ethyl) phenyl) imino) ethylidene) amino) phenol/carboxylated multi-walled carbon nanotubes hydrogel nanocomposite (CS-g-p(AA-co-DEAP)/MWCNTs-COOH) for Rhodamine B (RhB) dye adsorption. The materials’ adsorption process, thermal properties, and structural properties were studied using FT-IR, FESEM, TEM, TGA, and XRD analyses. Carbonyl and hydroxyl groups were found by FT-IR measurement. FESEM and TEM investigations showed a porous surface structure and surface shape changes after adsorption. Due to strong contacts between the copolymer, MWCNTs-COOH and efficient nanotube dispersion in the matrix, TGA studies showed that the hydrogel nanocomposite had enhanced heat stability. The composite hydrogel matrix had a well-dispersed and uniform distribution of MWCNTs-COOH. Equilibrium time was 120 min for adsorption. Dye adsorbed and equilibrium concentrations were represented by adsorption isotherms. The Langmuir, Freundlich, and Temkin isotherm models showed a high degree of consistency for RhB dye adsorption, indicating the heterogeneity of the adsorbent surface. The study finished by evaluating the temperature impacts on adsorption. Calculations showed that the adsorption process was exothermic and the contact between the adsorbent surface and dye molecules would diminish with temperature. The hydrogel nanocomposite’s adsorption behavior, surface morphology, and heat stability were thoroughly investigated, suggesting their utility in dye removal applications.