تهيه نانوكامپوزيت آئروژل سلولزي/MIP202 به روش برون جا و بررسي قابليت آن در حذف رنگ متيل ويولت از محلول هاي آبي

In this study, a cellulose aerogel/ MIP-202 nanocomposite was synthesized for the removal of cationic methyl violet dye from aqueous solutions, an‎d its adsorption performance was eva‎luated. The formation, structural, morphological, an‎d surface properties of the nanocomposite were investigated using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), nitrogen adsorption–desorption analysis, energy-dispersive X-ray spectroscopy (EDS), an‎d elemental mapping. The obtained results confirmed the successful formation of the nanocomposite an‎d the appropriate distribution of its constituent components. Subsequently, the effects of various parameters, including pH, temperature, contact time, adsorbent dosage, an‎d initial dye concentration, on the adsorption process were studied. The optimum adsorption conditions were obtained at pH 8, an initial dye concentration of 1000 mg L⁻¹, an adsorbent dosage of 5 mg, a contact time of 12 h, an‎d a temperature of 45 °C. Under these conditions, the removal efficiency an‎d adsorption capacity of methyl violet were calculated to be 79.6% an‎d 796 mg g⁻¹, respectively. The adsorption isotherm analysis revealed that the experimental data were best fitted by the Redlich–Peterson model, indicating a hybrid adsorption behavior involving both monolayer an‎d multilayer adsorption characteristics on a heterogeneous surface. Furthermore, kinetic studies demonstrated that the Elovich model provided the best fit for describing the adsorption process. Thermodynamic investigations showed that increasing temperature enhanced the adsorption process, confirming the endothermic nature of adsorption. The reusability eva‎luation of the adsorbent over three adsorption–desorption cycles showed that the removal efficiency decreased from 65% in the first cycle to 25% in the third cycle, which could be attributed to incomplete dye desorption an‎d the gradual reduction of available active adsorption sites. Overall, the synthesized nanocomposite, owing to its high adsorption capacity an‎d effective performance in methyl violet removal, can be considered a promising adsorbent for the treatment of dye-contaminated wastewater.

محمد ديناري , سياوش كاظمي موحد

حسين توكل , معصومه جديدي نژاد