Removal of Pb<sup>2+</sup>, CrT, and Hg<sup>2+</sup> Ions from Aqueous Solutions Using Amino-Functionalized Magnetic Nanoparticles

Removal of Pb<sup>2+</sup>, CrT, and Hg<sup>2+</sup> Ions from Aqueous Solutions Using Amino-Functionalized Magnetic Nanoparticles

In this paper, a circular economy approach with the adsorption and desorption of heavy metal (HM) ions—i.e., lead (Pb<sup>2+</sup>), chromium (CrT), and mercury (Hg<sup>2+</sup>)—from aqueous solutions was studied. Specific and selective binding of HM ions was performed on st...

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Bibliographic Details
Main Authors: A. F. P. Allwin Mabes Raj, Maja Bauman, Marijana Lakić, Nena Dimitrušev, Aleksandra Lobnik, Aljoša Košak
Format: Article
Language:English
Published: MDPI AG 2022-12-01
Series:International Journal of Molecular Sciences
Subjects:
superparamagnetic nanoparticles
iron-oxide
maghemite
functionalization
aminopropyltrimethoxysilane
adsorption
Online Access:https://www.mdpi.com/1422-0067/23/24/16186
Description
Summary:In this paper, a circular economy approach with the adsorption and desorption of heavy metal (HM) ions—i.e., lead (Pb<sup>2+</sup>), chromium (CrT), and mercury (Hg<sup>2+</sup>)—from aqueous solutions was studied. Specific and selective binding of HM ions was performed on stabilized and amino-functionalized iron oxide magnetic nanoparticles (γ-Fe<sub>2</sub>O<sub>3</sub>@NH<sub>2</sub> NPs) from an aqueous solution at pH 4 and 7. For this purpose, γ-Fe<sub>2</sub>O<sub>3</sub>@NH<sub>2</sub> NPs were characterized by thermogravimetric analysis (TGA), Fourier-transform infrared spectroscopy (FTIR), specific surface area (BET), transmission electron microscopy (TEM), EDXS, and zeta potential measurements (ζ). The effects of different adsorbent amounts (m<sub>ads</sub> = 20/45/90 mg) and the type of anions (NO<sub>3</sub><sup>−</sup>, Cl<sup>−</sup>, SO<sub>4</sub><sup>2−</sup>) on adsorption efficiency were also tested. The desorption was performed with 0.1 M HNO<sub>3</sub>. The results showed improvement of adsorption efficiency for CrT, Pb<sup>2+</sup>, and Hg<sup>2+</sup> ions at pH 7 by 45 mg of g-Fe<sub>2</sub>O<sub>3</sub>@NH<sub>2</sub> NPs, and the sequence was as follows: CrT > Hg<sup>2+</sup> > Pb<sup>2+</sup>, with adsorption capacities of 90.4 mg/g, 85.6 mg/g, and 83.6 mg/g, respectively. The desorption results showed the possibility for the reuse of γ-Fe<sub>2</sub>O<sub>3</sub>@NH<sub>2</sub> NPs with HNO<sub>3</sub>, as the desorption efficiency was 100% for Hg<sup>2+</sup> ions, 96.7% for CrT, and 91.3% for Pb<sup>2+</sup>.
ISSN:1661-6596
1422-0067

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