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Steel slag is a byproduct of the steel industry, which, due to its alkalinity, can act as a reactive support that can trigger the formation of catalytically active iron oxides\/hydroxides. A systematic study is conducted to evaluate the catalytic activity of steel slags modified with the following salts (or mixtures): FeSO<jats:sub>4<\/jats:sub>\u00b77H<jats:sub>2<\/jats:sub>O, FeCl<jats:sub>3<\/jats:sub>\u00b76H<jats:sub>2<\/jats:sub>O, and FeCl<jats:sub>2<\/jats:sub>\u00b74H<jats:sub>2<\/jats:sub>O. The modified steel slags are characterized by X\u2010ray powder diffraction, M\u00f6ssbauer spectroscopy, scanning electron microscopy, scanning transmission electron microscopy, energy dispersive X\u2010ray spectroscopy, nitrogen sorption analysis, and X\u2010ray photoelectron spectroscopy. All iron\u2010supporting steel slags demonstrate active behavior in the hydrogenation of nitrobenzene at 80 \u00b0C with the best results, in terms of activity, selectivity, and recyclability achieved with the catalyst prepared from FeCl<jats:sub>3<\/jats:sub>\u00b76H<jats:sub>2<\/jats:sub>O (<jats:bold>Fe3<\/jats:bold>). The scalability of the reaction is confirmed by carrying out a test on 12.5\u00a0mmol of substrate. The superiority of <jats:bold>Fe3<\/jats:bold> compared with the other studied materials is ascribed to its morphology and the remarkably high surficial area. The iron species active in the <jats:bold>Fe3<\/jats:bold> catalyst are noncrystalline oxo\u2013hydroxo species of Fe(III) (2L\u2010ferrihydrite).<\/jats:p>","DOI":"10.1002\/gch2.202500201","type":"journal-article","created":{"date-parts":[[2025,7,30]],"date-time":"2025-07-30T06:40:26Z","timestamp":1753857626000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Ferrihydrite Supported on Steel Slags as Catalyst for the Hydrogenation of Nitroarenes: A Virtuous Cycle of Wastes"],"prefix":"10.1002","volume":"9","author":[{"given":"Francesca","family":"Derobertis","sequence":"first","affiliation":[{"name":"Dipartimento di Ingegneria Civile, Ambientale, del Territorio, Edile e di Chimica DICATECh Politecnico di Bari  via Orabona 4 Bari 70125 Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Maria M.","family":"Dell'Anna","sequence":"additional","affiliation":[{"name":"Dipartimento di Ingegneria Civile, Ambientale, del Territorio, Edile e di Chimica DICATECh Politecnico di Bari  via Orabona 4 Bari 70125 Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nicoletta","family":"Ditaranto","sequence":"additional","affiliation":[{"name":"Dipartimento di Chimica and CSGI \u2013 Bari Unit Universit\u00e0 degli Studi di Bari Aldo Moro  via Orabona 4 Bari 70125 Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Luca","family":"Nodari","sequence":"additional","affiliation":[{"name":"Institute of Condensed Matter Chemistry and Technologies for Energy (ICMATE\u2010CNR) National Research Council (CNR)  C.so Stati Uniti 4 Padova 35127 Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Stefania","family":"Liuzzi","sequence":"additional","affiliation":[{"name":"Dipartimento ARCOD Politecnico di Bari  via Orabona 4 Bari 70125 Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ernesto","family":"Mesto","sequence":"additional","affiliation":[{"name":"Dipartimento di Scienze della Terra e Geoambientali Universit\u00e0 degli Studi di Bari Aldo Moro  via Orabona 4 Bari 70125 Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Emanuela","family":"Schingaro","sequence":"additional","affiliation":[{"name":"Dipartimento di Scienze della Terra e Geoambientali Universit\u00e0 degli Studi di Bari Aldo Moro  via Orabona 4 Bari 70125 Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Cristina","family":"Leonelli","sequence":"additional","affiliation":[{"name":"Dipartimento di Ingegneria \u201cEnzo Ferrari\u201d Universit\u00e0 degli Studi di Modena e Reggio Emilia  Via P. 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