Preparation, characterization, and adsorption properties of bis-salophen schiff base ligand immobilized on Fe3O4@SiO2 nanoparticles for removal of cadmium(II) from aqueous solutions

Articles in Press

Document Type : Original Article

Authors

1 Assistant Professor, Chemistry and Process Research Department, Niroo Research Institute (NRI), Tehran, Iran

2 Chemical and Process Engineering Department, Niroo Research Institute, Tehran, Iran

10.22034/ijche.2023.359408.1233

Abstract

Here in this research, a novel Fe3O4@SiO2/Schiff base nanoparticles was developed, aiming to remove Cd(II) ions from aqueous media. At first, iron oxide nanoparticles were synthesized by co-precipitation method, then Fe3O4@SiO2 core-shell structure was formed from iron oxide nanoparticles by Stöber method with coating silica and using tetraethoxysilane as a silica source. Afterwards, the core-shell nanoparticles were functionalized with 3-chloropropyl(triethoxy)silane, the synthetic molecule para-bis[(3,4-salicylicimino)benzophenimine] was supported on these nanoparticles and the final composition of Fe3O4@SiO2/Schiff base was synthesized. The properties of surface functional groups, crystal structure, magnetism and surface morphology of magnetic nanoparticles were characterized by fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), energy dispersive X-ray analysis (EDX), vibrating sample magnetometer (VSM), transmission electron microscopy (TEM) and field emission scanning electron microscopy (FE-SEM). Then, the adsorption kinetics and the effects of synthetic nanoadsorbents dosage on the removal of divalent cadmium ions were investigated that the results show the maximum absorption value of 92% at the ambient temperature. Also, the effect of pH on the amount of absorption in the range of 3-8 shows that the absorption of cadmium(II) increases with increasing pH and the maximum adsorption performance was observed at pH=7. Furthermore, the desorption of Cd(II) ions was done effectively using HCl solution, thereby proving that Fe3O4@SiO2-Schiff base can be regenerated and reused effectively for further process of removal.

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Iranian Chemical Engineering Journal

Articles in Press, Accepted Manuscript
Available Online from 20 September 2023

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