65087 2025 eng 1 15677 49 article Elsevier Ltd. 1 -- -- -- This work presents the design of air-stable core–shell zero-valent iron–nickel nanofilaments supported on silica and zeolite, developed to overcome the oxidation limitations of nano zero-valent iron in environmental catalysis. The nanofilaments feature ∼ 100 nm iron–nickel cores surrounded by ultrafine iron-rich threads embedded with aluminates and silicates, originating from partial support dissolution during synthesis. By varying the iron reduction time, three catalysts were prepared: one on silica reduced for 30 min, and two on zeolite reduced for 30 and 15 min. They were thoroughly characterized using nitrogen physisorption, X-ray diffraction, electron microscopy with elemental analysis, Mössbauer spectroscopy, and small-angle X-ray scattering. The zeolite-supported catalyst reduced for 15 min showed the highest activity for hexavalent chromium reduction (rate constant 8.054 min−1), attributed to a higher fraction of reactive iron–nickel phases formed under shorter reduction. Its tailored core–shell structure improves air stability and surface reactivity, highlighting its potential as a next-generation zero-valent iron nanocatalyst for aqueous remediation Materials Today Communications 2352-4928 10.1016/j.mtcomm.2025.114142 true journal-article https://www.elsevier.com/tdm/userlicense/1.0/ crossref PersonAuthorFirstName_1,PersonAuthorLastName_1,PersonAuthorIdentifierOrcid_1,PersonAuthorFirstName_2,PersonAuthorLastName_2,PersonAuthorFirstName_3,PersonAuthorLastName_3,PersonAuthorIdentifierOrcid_3,PersonAuthorFirstName_4,PersonAuthorLastName_4,PersonAuthorIdentifierOrcid_4,PersonAuthorFirstName_5,PersonAuthorLastName_5,PersonAuthorIdentifierOrcid_5,PersonAuthorFirstName_6,PersonAuthorLastName_6,PersonAuthorIdentifierOrcid_6,PersonAuthorFirstName_7,PersonAuthorLastName_7,PersonAuthorIdentifierOrcid_7,PersonAuthorFirstName_8,PersonAuthorLastName_8,PersonAuthorIdentifierOrcid_8,PersonAuthorFirstName_9,PersonAuthorLastName_9,PersonAuthorIdentifierOrcid_9,PublisherName,TitleMain_1,Language,TitleParent_1,ArticleNumber,Volume,PublishedYear,IdentifierIssn,Enrichmentlocal_crossrefLicence doi-import 11.12.2025 false true Leydi del Rocío Silva-Calpa Andrelaine de Souza Bernardes Roberto Ribeiro de Avillez Glen J. Smales Mariella Alzamora Camarena Carla Ramos Moreira Volodymyr Zaitsev Braulio Soares Archanjo Sonia Letichevsky eng uncontrolled nanofilaments eng uncontrolled Core–shell nanostructures eng uncontrolled Air-stable nanomaterials eng uncontrolled Structure-controlled FeNi nanoparticles eng uncontrolled Hexavalent chromium reduction eng uncontrolled X-ray scattering eng uncontrolled MOUSE Ingenieurwissenschaften und zugeordnete Tätigkeiten 6 Materialchemie 6.5 Synthese und Streuverfahren nanostrukturierter Materialien Material Verlagsliteratur Datei im Netzwerk der BAM verfügbar ("Closed Access") Advanced Materials