اميد محسني

Abstract This study aims to synthesize an‎d comparatively eva‎luate three alginate-based hydrogel adsorbents an‎d to elucidate the mechanism of an electric field’s effect on the adsorption kinetics of Cu2+ ions. For this purpose, pure alginate hydrogel (A), an alginate-activated carbon (A/AC) composite, an‎d an alginate-activated carbon-iron oxide (A/AC/MNPs) magnetic nanocomposite were synthesized an‎d characterized. The kinetic performance of the adsorbents in removing Cu2+ (initial concentration 500 ppm) was investigated in a batch system under different voltages (0, 5, an‎d 6 V). The experimental data were analyzed using pseudo-first-order (PFO) an‎d pseudo-second-order (PSO) kinetic models. Analysis of Variance (ANOVA) confirmed the significant effect of the adsorbent type, applied voltage, an‎d their interaction on the adsorption process. The results revealed a contradictory an‎d dualistic mechanistic response to the electric field. For pure alginate, the electric field acted as an accelerator, increasing the adsorption rate constant (k) up to 5-fold. In contrast, the field played an inhibitory role for both composite adsorbents; this effect was most pronounced for the A/AC/MNPs adsorbent, which exhibited a 10-fold decrease in its rate constant. This finding indicates that the activated carbon an‎d iron oxide nanoparticle additives act as accelerators in the absence of an electric field an‎d as inhibitors in its presence. Therefore, the selec‎tion of the optimal adsorbent is entirely application-dependent: pure alginate offers the highest kinetic performance for electro-adsorption processes, whereas the A/AC/MNPs nanocomposite is superior under non-electric adsorption conditions. By providing a deep understan‎ding of the dual mechanism of the electric field, this research offers a new perspective for the targeted design of adsorbents for advanced water treatment applications.

جذب الكتريكي , هيدروژل نانوكامپوزيت , سينتيك جذب , نانوذرات مغناطيسي , كربن فعال , حذف آلاينده

Electrosorption , Nanocomposite Hydrogel , Adsorption Kinetics , Magnetic Nanoparticles , Activated carbon , Pollutant Removal

Omid Mohseni

Dr. Parisa Hejazi