Real-time Cr(VI) monitoring and remediation using Fe3O4 nanoparticles: Insights into Fe-Cr Spinels

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...

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Detalles Bibliográficos
Autores: Martínez Boubeta, Carlos, Balcells, Luis, Beltrán Fínez, Juan Ignacio, Martínez Peña, G. I., Virgiliou, C., Kalaitzidou, K., Vourlias, G., Teran, F. J., Salutari, F., Spadaro, M. Chiara, Arbiol, J., Simeonidis, K.
Tipo de recurso: artículo
Fecha de publicación:2025
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/126510
Acceso en línea:https://hdl.handle.net/20.500.14352/126510
Access Level:acceso abierto
Palabra clave:538.9
544
Drinking water monitoring
Pollutant sensors
Hexavalent chromium
Magnetite nanoparticles
Magnetic anisotropy
AC magnetometry
DFT calculations
XPS analysis
Física de materiales
Agua
Física (Química)
2210 Química Física
Descripción
Sumario: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.

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