Removal of Lead Metal Ion from Aqueous Solution with Fe3O4@SiO2 Core-Shell Magnetic Nanoadsorbent Functionalized with Polyvinyl Alcohol

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Esmaeilpour Mohsen; Ghahraman Afshar Majid; Kazemnejadi Milad

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Journal Paper

Paper Information

Journal: APPLIED RESEARCH IN CHEMICAL POLYMER ENGINEERING Year:2024 | Volume:8 | Issue:1 Page(s): 12-25

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Title

Removal of Lead Metal Ion from Aqueous Solution with Fe3O4@SiO2 Core-Shell Magnetic Nanoadsorbent Functionalized with Polyvinyl Alcohol

Author(s)

Esmaeilpour Mohsen | Ghahraman Afshar Majid | Kazemnejadi Milad | Issue Writer Certificate

Keywords

Fe3O4@SiO2 nanoparticles

solid phase extraction

heavy metals

Adsorption

Abstract

Research subject: The presence of heavy metal ions in surface and underground water, followed by their infiltration into drinking water at high concentrations, poses irreparable risks to human health and the environment. In this context, solid-phase extraction (SPE) has recently been recognized as a routine and practical method for removing heavy metals from water and wastewater samples. Consequently, the development of selective adsorbents for application in the SPE method is of significant importance in environmental studies.
Research Approach: In the present study, polyvinyl alcohol (PVA) molecules were functionalized onto Fe₃O₄@SiO₂ core-shell nanoparticles using cyanuric chloride and triethoxysilyl propylamine compounds. The synthesized nanoparticles were then employed as an effective adsorbent for the removal of Pb²⁺ ions from aqueous solutions. The structural characteristics, morphology, and particle size were analyzed using Fourier-transform infrared (FTIR) spectroscopy, energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), thermogravimetric analysis (TGA), vibrating sample magnetometry (VSM), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). Furthermore, the key operational parameters affecting adsorption performance were evaluated to optimize the adsorption capacity for the effective removal of heavy metal contaminants.
Main Results: The optimal adsorption capacity of 89% was achieved under the following conditions: pH 7, a contact time of 35 minutes, 32 mg of adsorbent in 50 mL of solution with an initial Pb²⁺ concentration of 72.52 mg/L (0.35 mmol/L), at ambient temperature. Additionally, the synthesized nanoadsorbent demonstrated recyclability for up to five adsorption-desorption cycles without a significant decline in functional efficiency.

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