Removal and determination of Malachite Green dye using nanofiber membranes and UV-Vis spectrophotometer

The removal of malachite green (MG) dye on nanofiber membranes, which were prepared by the electrospinning technique, was studied after preparing a suitable resin to act as an efficient adsorbent. A UV-Vis spectrophotometer determined the MG concentration. The morphology of nanofiber membranes with an average diameter of ۵۵۰ nm was studied by SEM, EDX, and XPS techniques. The batch approach was used to study the factors affecting the adsorption, which included the effect of equilibrium time, the adsorbent dose, the initial dye concentration, and temperature. The adsorption isotherms were also studied according to the Freundlich and Langmuir models and the thermodynamic functions. The results showed that the maximum adsorption efficiency was ۹۲.۹۴۶% at ۳۱۸ K, and the adsorption capacity of the adsorbent was ۱۸.۴ mg g-۱. Analytical chemistry features such as the limit of detection (LOD: ۰.۳ mg L-۱), limit of quantification (LOQ: ۰.۹ mg L-۱), and linear range (۱-۵۰ mg L-۱) were obtained. From the correlation coefficient values, it was found that the Langmuir model is more suitable than the Freundlich model for describing the general adsorption isotherm. Also, the amount of dye molecule adsorption increases with increasing temperature (Endothermic Process), and there is more random movement on the nanofiber membrane than in the aqueous solution. The process occurs spontaneously as indicated by the positive values of ΔH° and ΔS° and the negative value of ΔG°.

کلیدواژه ها:

Adsorption ، Malachite Green ، UV-VIS spectrophotometer ، Nanofiber membranes ، Electrospinning technique ، Isotherms