The adsorption performance of magnetic gelatin nanofiber for Orange G removal

In this work, the usability of magnetic gelatin nanofiber (MGNF) for anionic dye removal was investigated in the aqueous solution. For this aim, the MGNF was prepared using the electrospinning technique with the addition of Fe 3 O 4 nanopowders. After the characterization of MGNF with Fourier transform infrared spectroscopy, swelling test, scanning electron microscope, and energy-dispersive X-ray analysis, the adsorption performance of MGNF against the dye molecule, Orange G, was examined by changing the pH of the media, the dye concentration, and the ionic strength. The experimental results showed that the maximum adsorbed amount of Orange G was found as 15.6 mg/g at pH 3 value and the Orange G adsorption behavior was endothermic, physical, and suited to the Langmuir adsorption isotherm model. The adsorption kinetic of Orange G was evaluated with the pseudo-first-order, the pseudo-second-order, and the Elovich kinetic models and the pseudo-second-order model results fitted the experimental findings as compared to the other models. The affordable magnetic adsorbent was capable of maintaining its stability after five consecutive adsorption, desorption, and regeneration cycles without significant loss of adsorption capacity.