Magnetically enhanced Fenton-like processes by nanofibers: real-time observation of tetracycline degradation in pig manure wastewater

Centro Elia, Berta (Universidad de Zaragoza) ; Morales Ovalle, Marco Antonio ; Franco, Vanina G. ; Fuentes García, Jesús Antonio ; Goya, Gerardo F. (Universidad de Zaragoza)

Resumen: This work investigates the degradation of tetracycline (TC) in pig manure wastewater by a magnetically assisted heterogeneous Fenton-like process using MnFe2O4 magnetic nanoparticles (MNPs) embedded into polyacrylonitrile nanofibers (MNFs), resulting in flexible mats with high magnetic heating capacity (SLP approximate to 2.2 kW/g in air). TC degradation was monitored in real time by UV - Vis spectroscopy, showing that the MNF/H2O2 system could reduce the TC concentration from [TC](0)approximate to 6 mu g/mL to [TC]approximate to 50ng/mL after 40 & planckh;, corresponding to a >99% removal. Control (blank) PAN fibres showed only a slow adsorption/degradation rate of approximate to 8ng/mL & sdot;& planckh;. The degradation kinetics displayed three regimes: an induction time (similar to 5 & planckh;), followed by accelerated degradation and late-time deactivation. A heterogeneous dynamic kinetic model (DKM) was used to describe the degradation mechanism, incorporating reactive oxygen species (ROS) generation, catalyst surface inactivation, and polymer stripping effects. The application of an alternating magnetic field (H-0=32kA/mf=450kHz) shortened the induction period from several hours to minutes, through the local heating of the MNFs (up to approximate to 51 degrees C). For a concentrated pig-manure filtrate ([TC](0)approximate to 0.32 mu g/mL), circulation through MNFs with H2O2 resulted in approximate to 50% TC removal. We propose that the degradation process was driven by hydroxyl radical (center dot OH) formation through hydrogen peroxide (H2O2) activation on the MNPs surface. The magnetically triggerable Mn2FeO4@PAN nanofibers show that heterogeneous Fenton catalysis can be synergistically combined with localized magnetic heating to accelerate antibiotic degradation, offering a scalable, reusable and efficient alternative for antibiotic-contaminated wastewater with reduced iron sludge versus conventional homogeneous Fenton process..

Idioma: Inglés

DOI: 10.1080/09593330.2025.2607666

Año: 2026

Publicado en: ENVIRONMENTAL TECHNOLOGY (2026), 1-15
ISSN: 0959-3330

Financiación: info:eu-repo/grantAgreement/EC/H2020/101007629 /EU/Nanomaterials for Enzymatic Control of Oxidative Stress Toxicity and Free Radical Generation/NESTOR
Financiación: info:eu-repo/grantAgreement/ES/MICINN/PDC2021-121409-I00

Tipo y forma: Article (PostPrint)

Área (Departamento): Área Ingeniería Química (Dpto. Ing.Quím.Tecnol.Med.Amb.)
Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)