Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Polyethylenimine Grafted on Nano-NiFe2O4@SiO2 for the Removal of CrO42‒, Ni2+, and Pb2+ Ions from Aqueous Solutions

Version 1 : Received: 4 December 2023 / Approved: 4 December 2023 / Online: 4 December 2023 (15:23:20 CET)

A peer-reviewed article of this Preprint also exists.

Polyethylenimine Grafted onto Nano-NiFe2O4@SiO2 for the Removal of CrO42−, Ni2+, and Pb2+ Ions from Aqueous Solutions. Molecules 2024, 29, 125. Polyethylenimine Grafted onto Nano-NiFe2O4@SiO2 for the Removal of CrO42−, Ni2+, and Pb2+ Ions from Aqueous Solutions. Molecules 2024, 29, 125.

Abstract

Polyethyleneimine (PEI) has been reported to have good potential for the adsorption of metal ions. In this work, PEI was covalently bound to NiFe2O4@SiO2 nanoparticles to form the new adsorbent NiFe2O4@SiO2–PEI. The material allowed magnetic separation and was characterized via powder X-ray diffraction (PXRD), field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX), Fourier-transform IR spectroscopy (FT-IR), and thermogravimetry-differential thermal analysis (TGA-DTA). The adsorption of CrO42‒, Ni2+, and Pb2+ ions from aqueous solutions was studied at different pH, temperatures, metal ion concentration, and adsorbent dosage. Maximum adsorption capacities of 149.23, 156.68, and 161.25 mg/g were obtained for CrO42‒, Ni2+, and Pb2+, respectively under optimum conditions using 0.075 g of the adsorbent material 250 mg/L ion concentration, at pH = 6.5 and room temperature.

Keywords

polyethyleneimine; core-shell NiFe2O4@SiO2; magnetic separation; toxic metals; adsorption

Subject

Chemistry and Materials Science, Inorganic and Nuclear Chemistry

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