Application of magnetic nanoadsorbent functionalized with bis[(3,4-salicylic imino)benzophen imine] for zinc ions removal

Document Type : Original Article

Authors

1 Chemistry Department, Faculty of Science, Imam Khomeini International University (IKIU), Qazvin, Iran

2 Chemistry and Process Research Department, Niroo Research Institute (NRI), Tehran, Iran

Abstract

In the present study, Fe3O4@SiO2 nanoparticles are initially synthesized using coprecipitation and Stöber methods. Afterwards, these nanoparticles are functionalized with bis(3,4-salicylic imino)benzophen imine ligand. Finally, the synthesized nanoparticle is applied as an effective nanoadsorbent for the adsorption of zing ions. For this purpose, the structural features, morphology and particle size of the synthetic nanoadsorbent are evaluated using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), energy dispersive X-ray (EDX) and vibrating sample magnetometer (VSM). Moreover, the performance of the adsorbent is evaluated by optimizing the adsorption parameters such as adsorbent dosage, pH, initial concentration and adsorbent contact time. The results indicate that the use of 25 mg of adsorbent in 50 mL of zing ion solution (initial concentration 0.55 mmol/L) for a contact time of 28 min at pH 7 results in the adsorption of 93% of the target ion. In addition, the nanoadsorbent has the ability to be recovered and reused in sequential adsorption-desorption processes for 7 times without appreciable decrease in adsorption activity. The proposed adsorbent has high coordination strength, high surface area to volume ratio, high adsorption active sites, easy synthesis, magnetic separation, high adsorption capacity, and the suitable ability to be recycled.

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Applied Chemistry Today
Volume 20, Issue 76
December 2025
Pages 9-30

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