RT Journal Article
T1 Real-time Cr(VI) monitoring and remediation using Fe3O4 nanoparticles: Insights into Fe-Cr Spinels
A1 Martínez Boubeta, Carlos
A1 Balcells, Luis
A1 Beltrán Fínez, Juan Ignacio
A1 Martínez Peña, G. I.
A1 Virgiliou, C.
A1 Kalaitzidou, K.
A1 Vourlias, G.
A1 Teran, F. J.
A1 Salutari, F.
A1 Spadaro, M. Chiara
A1 Arbiol, J.
A1 Simeonidis, K.
AB An analytical approach for the rapid and remote determination of Cr(VI) in water samples is demonstrated using Fe3O4 nanoparticles and a cost-effective portable AC magnetometer. Cr(VI) reduction by surface Fe²⁺ leads to Fe/Cr precipitate formation, which alters the nanoparticles’ magnetic properties. Validation in natural water spiked with Cr(VI) showed a linear correlation between magnetic remanence and Cr(VI) concentrations from 0 to 10 mg/L, with a R2 value of 0.99. Limitations of the method emerged at loadings above 10 mg/g, where extensive chromite (CrxFe3-xO4) coverage reduced the magnetic hysteresis area. Advanced characterization and DFT calculations revealed changes in spin-dependent properties, including magnetization reversal, electrical conductivity and magnetoresistance. This robust correlation between collective magnetic properties and Cr(VI) exposure enables, for the first time, milligram-per-liter detection via ultra-fast AC magnetometry, paving the way for real-time insight into redox processes in liquid environments and novel strategies for environmental remediation.
PB Elsevier
SN 2214-7144
YR 2025
FD 2025-08-20
LK https://hdl.handle.net/20.500.14352/126510
UL https://hdl.handle.net/20.500.14352/126510
LA eng
NO C. Martinez-Boubeta, Ll. Balcells, J.I.B. Finez, G.I. Martinez-Peña, C. Virgiliou, K. Kalaitzidou, G. Vourlias, F.J. Teran, F. Salutari, M.C. Spadaro, J. Arbiol, K. Simeonidis, Real-time Cr(VI) monitoring and remediation using Fe3O4 nanoparticles: Insights into Fe-Cr Spinels, Journal of Water Process Engineering 77 (2025) 108496. https://doi.org/10.1016/j.jwpe.2025.108496.
NO © 2025 The Authors.PTQ2021-012178
NO Minisiterio de Ciencia e Innovación (España)
NO Agencia Estatal de Investigación (España)
NO European Commission
NO Nanotech Solutions S.L.
NO Hellenic Foundation for Research and Innovation
NO Generalitat de Catalunya
DS Docta Complutense
RD 21 ene 2026