Synthesis characterization and investigation of selenium adsorption of modified poly (ethylene terephthalate) fibers

In this study, 4-Vinyl pyridine grafted poly (ethylene terephthalate), (4VP-g-PET) fibers were synthesized using the radical polymerization method and used as a novel adsorbent for removing selenite (SeO32-) ions from aqueous solutions. SEM (scanning electron microscopy) and FTIR (fourier transformed infrared) spectroscopy were used to examine the structure of the synthesized fibers. Batch experiments were used to conduct adsorption research. pH, grafting yield, adsorption time, initial selenite concentration, and temperature were all investigated to see how they affected adsorption efficiencies. At pH 6, selenite was best isolated from aqueous solutions. Also in highly alkaline environments, fibers displayed significant adsorption potential at pHs higher than their pHpzc (7,5). Within 3 hours, adsorption equilibrium was reached, and the overall adsorption mechanism matched the pseudo-first-order kinetic model. Grafting yield increased the amount of selenium adsorption by up to 47 percent, but further increases in grafting yield were found to damage the fibers' adsorption capability. The synthesized fibers' maximum selenite adsorption capacity was found to be 28 mg/g. Thermodynamic parameters ∆G0, ∆S0 and ∆H0 of the adsorption were also calculated from the graphical interpretation of the experimental data obtained from the effect of temperature studies. The adsorption reaction was discovered to be exothermic. The effect of pH, kinetic activity, and thermodynamic parameters were used to estimate possible adsorption mechanisms. The 4VP-g-PET fibers that were created may be a promising alternative adsorbent for removing selenite from aqueous media.