Enormous adsorption of methyl blue onto Ni_xMg_yCu_(1-x-y)Fe₂O₄ magnetic nanoparticles synthesized by a rapid combustion method.

Authors

Xiaofang Zhu, Zhenghui Ge, Zhou Wang, Xuejie Fu, Zhan-Ao Wu

Published in

Frontiers in chemistry. Volume 14. Pages 1912403. Epub Jul 27, 2026.

Abstract

Dye wastewater poses serious threats to human health and ecosystem stability worldwide. Therefore, developing effective treatment strategies has become increasingly important.
In this work, a rapid combustion approach was employed to fabricate Ni_xMg_yCu_(1-x-y)Fe₂O₄ magnetic nanoparticles (MNPs) with high structural homogeneity, and characterized by several methods such as XRD, TEM, VSM, XPS, BET, and FTIR to identify for attaining a reduced particle size, and Ni_0.1Mg_0.8Cu_0.1Fe₂O₄ MNPs with the average particle size of 17.4 nm and the saturation magnetization of 4.73 emu/g were employed due to their enhanced magnetic properties calcined at 400 °C for 2 h with ethanol of 25 mL.
Under initial methyl blue (MB) concentrations ranging from 800 to 1,100 mg/L, the adsorption kinetics were well described by the pseudo-second-order model, indicating that chemisorption was the dominant rate-limiting mechanism. Among the evaluated isotherm models, the Freundlich equation exhibited the best correlation with experimental data (R² = 0.9893), implying a heterogeneous surface adsorption mechanism involving multiple molecular layers. Furthermore, after five consecutive adsorption-desorption cycles, the nanoparticles retained approximately 90.7% of their initial adsorption capacity, demonstrating the robust reusability and structural stability.
Ni_0.1Mg_0.8Cu_0.1Fe₂O₄ MNPs revealed excellent stability, enormous adsorption capacity and rate of MB, and commendable recycle, which highlighted the potential of Ni_0.1Mg_0.8Cu_0.1Fe₂O₄ MNPs as a candidate for wastewater treatment.

PMID:
42577147
Bibliographic data and abstract were imported from PubMed on 11 Aug 2026.

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