Gómez Polo, CristinaCervera Gabalda, Laura MaríaGarayo Urabayen, EnekoBeato López, Juan JesúsPérez de Landazábal Berganzo, José Ignacio2024-10-182024-10-182024-07-30Gómez-Polo, C., Cervera-Gabalda, L., Garaio, E., Beato-López, J. J., Peréz-Landazábal, J. I. (2024). Modulating photocatalytic activity of nitrogen doped TiO2 nanoparticles via magnetic field. Journal of Environmental Chemical Engineering, 12(5), 1-9. https://doi.org/10.1016/j.jece.2024.113643.2213-292910.1016/j.jece.2024.113643https://academica-e.unavarra.es/handle/2454/52323The effect of the magnetic field on the photocatalytic activity of TiO2-based nanoparticles is analyzed using a magnetically-assisted photoreactor with permanent magnets to generate a controlled uniform magnetic field, B (¿82 mT). Nitrogen doped TiO2 nanoparticles (sizes around 10 nm) were synthesized through a solvothermal method employing Ti(IV) butoxide and HNO3 (x = 0, 0.5, 1, 1.5 and 2 mL) as precursors and their structural, optical and magnetic properties were analyzed. Specifically, nitrogen doping is confirmed through Hard X-ray Photoelectron Spectroscopy (HAXPES) in those samples synthesized with low HNO3 concentrations (x = 0.5, 1). The correlation between spin polarization (magnetic susceptibility) and visible photocatalytic activity (methyl orange as a model organic pollutant) is particularly analyzed. Surprisingly, opposite effects of the magnetic field on the photocatalytic performance are found in the visible range (above 400 nm) or under UV-Vis irradiation (decrease and increase in the photocatalytic activity, respectively, under magnetic field). The Langmuir-Hinshelwood model allows us to conclude that the strong decrease in adsorption under the magnetic field (around 42 % for x = 0.5) masks the increase in the kinetic constant (close to 58 % for x = 0.5) related mainly to the effect of Lorentz forces on the reduction of the electron-hole recombination.application/pdfapplication/mswordeng© 2024 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC licenseMagnetic fieldNanoparticlesPhotocatalysisTiO2info:eu-repo/semantics/article2024-10-18info:eu-repo/semantics/openAccess