Work

Polyamide-based magnetic graphene oxide nanocomposite for efficient Pb(II) removal from aqueous solutions

Year: 2025

Type: article

Abstract: An aromatic polyamide (PA) containing imine and azo groups was synthesized successfully via a direct polycondensation reaction. Graphene oxide (GO) was prepared by a modified Hummers method. The GO surface was modified non-covalently with PA chains through the in-situ magnetization of PA and GO to prepare the PA@MGO as a novel nanocomposite. The preparation of PA@MGO nanocomposite was evaluated using different analysis techniques. The results showed that the introduced nanocomposite was successfully prepared with sphere-like nanoparticles and exhibited high saturation magnetization, as well as higher thermal stability compared to its components. The multifunctional nanocomposite served as a novel nanosorbent for the removal of Pb(II) from aqueous solutions, and various parameters, such as sorbent dosage, contact time, solution pH, initial concentration of Pb(II), and selectivity, were studied. The experiments showed that the removal efficiency and the adsorption capacity of PA@MGO (99 % and 36.14 mg/g, respectively) were higher than those of each component at pH 6 with the same sorbent dosage. The pseudo -second-order kinetics and Langmuir isotherm models provided a proper explanation of the Pb(II) adsorption on PA@MGO. Additionally, the selectivity results showed that the Pb(II) removal process was not significantly affected in the presence of competing ions such as Na(I), K(I), Mg(II), and Al(III). The prepared nanosorbent was capable of up to 5 cycles for Pb(II) removal, without a noticeable decrease in removal efficiency (10 %) and no structural changes. In this paper, we prepared a novel thermally stable magnetic nanosorbent for the selective Pb(II) removal from aquatic environments, featuring reusability properties up to five cycles, making it a potential material.

Source: Journal of Alloys and Compounds

DOI: 10.1016/j.jallcom.2025.182888

Authors: Sepideh Pourrohani, Saied Shafiei Navid, Yaghoub Sarrafi, Mahmood Tajbakhsh

Institution: University of Mazandaran

Language: English

Topic: Adsorption and biosorption for pollutant removal

Subfield: Water Science and Technology

Field: Environmental Science

Domain: Physical Sciences

SDGs: Responsible consumption and production, Clean water and sanitation

Open Access status: hybrid

Estimated APC paid: $3,660