سنتز و مشخصه يابي نانوكامپوزيت ايروژل گرافن اكسيد - نيكل فريت و بررسي كاربرد آن در حذف سرب از آب

In this study, spinel-structured nickel ferrite nanoparticles were first synthesized via a microwave-assisted method. Owing to the uniform heating an‎d rapid reaction kinetics provided by this approach, nanoparticles with homogeneous size distribution an‎d desirable structural properties were obtained. Microscopic analyses revealed a uniform elemental distribution within the synthesized nanoparticles, with an average particle size of approximately 50 nm. Subsequently, in order to enhance the structural, surface, an‎d functional properties, the nickel ferrite nanoparticles were homogeneously dispersed within a graphene oxide matrix. The graphene oxide–nickel ferrite aerogel nanocomposite was then fabricated using a hydrothermal method. This technique, by establishing controlled reaction conditions, enabled the formation of a three-dimensional network with high porosity an‎d suitable structural stability. The results obtained from the multi-point BET model indicated that the specific surface area of the nanocomposite was 31.63 m² g⁻¹. Nitrogen adsorption–desorption isotherms confirmed the presence of a mesoporous structure with multilayer adsorption occurring in bottle-shaped, compact, interconnected, an‎d open mesopores, a feature that can facilitate mass transfer an‎d enhance the diffusion of metal ions. X-ray diffraction patterns further demonstrated that the nickel ferrite nanoparticles were successfully immobilized within the graphene framework, forming a uniform, porous, an‎d crystalline structure. Moreover, increasing the weight percentage of nickel ferrite nanoparticles within the graphene matrix not only improved the degree of crystallinity but also led to an enhancement in the saturation magnetization of the samples, which can play a significant role in the magnetic separation of the adsorbent. Adsorption performance eva‎luation showed that the synthesized aerogel exhibited a high capacity for the removal of metal ions from aqueous solutions. To investigate the adsorption parameters, various models were fitted to the experimental data. Isotherm analysis revealed that the Sips model provided the best description of the adsorption behavior, as evidenced by the highest coefficient of determination. The maximum experimental adsorption capacity was determined to be 306.8 mg g⁻¹ at an equilibrium concentration of 123.3 mg L⁻¹.These characteristics render the developed nanocomposite a promising can‎didate for applications in water purification an‎d quality improvement at both laboratory an‎d industrial scales.

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وحيد صباغي

كاظم كرمي , كيومرث زرگوش