124370 20241125101130.0 doi 10.1016/j.matdes.2023.111615 sideral 132684 ART-2023-132684 eng Fuentes-García, J.A. Universidad de Zaragoza Magnetic nanofibers for remotely triggered catalytic activity applied to the degradation of organic pollutants 2023 Access copy available to the general public Unrestricted This work reports on the fabrication and characterization of a novel type of electrospun magnetic nanofibers (MNFs), and their application as a magnetically-activable catalysts for degradation of organic pollutants. The magnetic stimulation capability for the catalytic action is provided by iron-manganese oxide (MnxFe2-xO4) magnetic nanoparticles (MNPs) embedded into electrospun polyacrylonitrile (PAN), which provides stability and chemical resistance. The MNPs (average size d = 40 ± 7 nm) were first obtained by a green and fast sonochemical route, and subsequently embedded into electrospun PAN nanofibers. The final MNFs showed an average diameter of 760 ± 150 nm, providing a superhydrophobic surface with contact angle (θc = 165°), as well as a considerable amount ( 50 % wt.) of embedded MNPs (Mn0.5Fe2.5O4), thermally stable up to temperatures of 330 °C. The catalytic Fe2+/3+/Mn2+/3+/4+ active centers on the MNPs of MNF’s surface could be remotely activated by alternating magnetic fields (AMF) to degrade the methyl blue (MB). Remarkable stability of the MNFs during heating under extreme pH conditions (3 < pH < 10) was observed along several catalytic cycles. The degradation kinetics in presence of hydrogen peroxide showed followed the Langmuir–Hinshelwood model with an average efficiency > 80 %, after several cycles of reusing the same sample without any regeneration process. The capacity of these materials as a catalytic material with magnetic remote activation makes them appealing for those catalytic applications under conditions of darkness or restrained access, where photocatalytic reaction cannot be achieved. info:eu-repo/grantAgreement/EC/H2020/101007629 /EU/Nanomaterials for Enzymatic Control of Oxidative Stress Toxicity and Free Radical Generation/NESTOR This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 101007629 -NESTOR info:eu-repo/grantAgreement/ES/MICIU/PDC2021-121409-I00 info:eu-repo/grantAgreement/ES/MICIU/PID2019-106947RB-C21 info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 7.6 2023 MATERIALS SCIENCE, MULTIDISCIPLINARY 80 / 439 = 0.182 2023 Q1 T1 1.684 2023 Materials Science (miscellaneous) 2023 Q1 Mechanics of Materials 2023 Q1 Mechanical Engineering 2023 Q1 14.3 2023 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Sanz, B. Mallada, R. Universidad de Zaragoza (orcid)0000-0002-4758-9380 Ibarra, M.R. Universidad de Zaragoza (orcid)0000-0003-0681-8260 Goya, G.F. Universidad de Zaragoza (orcid)0000-0003-1558-9279 5005 555 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Ingeniería Química 2003 395 Universidad de Zaragoza Dpto. Física Materia Condensa. Área Física Materia Condensada 226 (2023), 111615 [9 pp.] Mater. des. Materials & design 0264-1275 1752989 http://zaguan.unizar.es/record/124370/files/texto_completo.pdf Versión publicada 2035827 http://zaguan.unizar.es/record/124370/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:124370 articulos driver 2024-11-22-11:58:44 ARTICLE