Evaluation of Ze/PAN Nanocomposites for Adsorption of Cs (Ι) from Aaqueous Environments

Recently, there has been an increasing trend in using nano adsorbents to remove harmful metal ions, like cesium. However, the search for a natural adsorbent that can be sourced from the environment and demonstrate satisfactory efficacy remains unfulfilled. This study utilized a zeolite–polyacrylonitrile nanocomposite (Ze@PAN) as an adsorbent to separate cesium from an aqueous medium. Various characterization methods, including FT-IR, SEM, XRD, XRF, EDX, BET, and TGA, were employed to investigate the synthesized nanocomposite. To determine the optimal conditions for adsorption, we examined the impact of the initial pH of aqueous solution, contact time, solution temperature, reusability, and stability of cesium on the Ze@PAN nano sorbent. In addition, we calculated the adsorption thermodynamic factors, like standard entropy, enthalpy, and Gibbs free energy, which proved that the reaction is endothermic and spontaneous. We evaluated the Freundlich, Temkin, and Langmuir isotherm models, finding that cesium sorption on the synthesized sorbent was best represented by the Langmuir model (qmax = ۵۹.۵۲ mg g-¹) and the Freundlich model (KF = ۶.۴۰ (mg g-¹) (L mg-¹ ۱/n). Finally, to assess the reaction kinetics of the synthesized nanocomposite, we explored various equations, including the pseudo-first order, pseudo-second order, and simple Elovich equations. Our findings showed the consistency between the reaction mechanism and the pseudo-second-order kinetic model. Overall, the findings suggest that the synthesized nano adsorbent is an effective and valuable material with a large surface area relative to its volume, making it suitable for both environmental and industrial applications.

کلیدواژه ها:

Cs (Ι) ، Zeolite- Polyacrylonitrile (Ze@PAN) nanocomposite ، Surface adsorption