Removal of Pb(II) and Cd(II) heavy metals from aqueous solution by FeNi3@MnO2 core-shell nanostructure

• Published in: Journal of dispersion science and technology Vol. 45; no. 3; pp. 402 - 413
• Main Authors: Mousavi Ghahfarokhi, Seyed Ebrahim, Hamalzadeh Ahmadi, Fatemeh
• Format: Journal Article
• Language: English
• Published: Philadelphia Taylor & Francis 14-02-2024; Taylor & Francis Ltd
• Subjects: Adsorbents; Adsorption; adsorption mechanism; adsorption parameters; Aqueous solutions; Cadmium; Core-shell structure; Electron microscopes; Endothermic reactions; Field emission microscopy; Field emission spectroscopy; Fourier transforms; Heavy metals; Infrared analysis; Infrared spectroscopy; Langmuir isotherm; Lead; Magnetic adsorbents; Manganese dioxide; Nanostructure; regeneration study; Room temperature
• ISSN: 0193-2691; 1532-2351
• DOI: 10.1080/01932691.2022.2151461

In this article, FeNi
3
@MnO
2
core-shell nanostructure has been used for the first time to remove Pb(II) and Cd(II) from aqueous solutions by adsorption. The MnO
2
-coated FeNi
3
magnetic nanoparticles were synthesized by the hydrothermal method and characterized by various analytic methods such as X-ray diffraction, Fourier-transform infrared spectroscopy (FTIR), field emission scanning electron microscope, transmission electron microscope, and atomic absorption spectrometry. Adsorption parameters such as pH, contact time, adsorbent amount, and initial concentration of metal ions were investigated and optimized. FTIR Spectrum of the nanostructure was used to analyze the adsorption mechanism. FeNi
3
@MnO
2
adsorbent was shown to follow the Langmuir adsorption isotherm and the pseudo-second-order kinetic model. The thermodynamics of adsorption confirmed an endothermic and spontaneous process. The calculated maximum adsorption capacities of the adsorbent for Pb(II) and Cd(II) were 129.2 mg g
−1
and 127.8 mg g
−1
at room temperature, which confirmed a good adsorption performance, especially for Cd(II). The adsorbent had a good removal efficiency of more than 99% for both metal ions, which was achieved in only 20 minutes.