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The photocatalytic activity of the nanomaterials was investigated by decolorizing Rhodamine B (RhB) dye in an aqueous solution. The main results showed that there is anatase-to-rutile transformation after the calcination process. The Fe-doped process modified the TiO2 spectrum and showed a connection in the Ti\u2013O\u2013Fe vibration. The particle size is within the nanometer range, between 20\u201351 nm, except for calcined TiO2. The inclusion of Fe in TiO2 decreased the band gap energy from 3.16 (reference) up to 2.06 eV (1:3). Additionally, after the calcination, there was a decrease in this value from 3.03 eV (reference) up to 1.95 eV (1:1.6). The TiO2, with a ratio of (1:1.6), showed the highest activity in the photocatalytic degradation of RhB with an efficiency of 93.8% after 3 h of irradiation.<\/jats:p>","DOI":"10.3390\/catal13010058","type":"journal-article","created":{"date-parts":[[2022,12,28]],"date-time":"2022-12-28T08:38:19Z","timestamp":1672216699000},"page":"58","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":24,"title":["Effect of Iron-Doping on the Structure and Photocatalytic Activity of TiO2 Nanoparticles"],"prefix":"10.3390","volume":"13","author":[{"given":"C\u00e1tia","family":"Afonso","sequence":"first","affiliation":[{"name":"Centre of Physics of Minho and Porto Universities (CF-UM-UP),  Azur\u00e9m Campus, University of Minho, 4800-058 Guimar\u00e3es, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5702-006X","authenticated-orcid":false,"suffix":"Jr.","given":"Orlando","family":"Lima","sequence":"additional","affiliation":[{"name":"ISISE, Department of Civil Engineering, Azur\u00e9m Campus, University of Minho, 4800-058 Guimar\u00e3es, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4199-5994","authenticated-orcid":false,"given":"Iran Rocha","family":"Segundo","sequence":"additional","affiliation":[{"name":"Centre of Physics of Minho and Porto Universities (CF-UM-UP),  Azur\u00e9m Campus, University of Minho, 4800-058 Guimar\u00e3es, Portugal"},{"name":"ISISE, Department of Civil Engineering, Azur\u00e9m Campus, University of Minho, 4800-058 Guimar\u00e3es, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1830-7548","authenticated-orcid":false,"suffix":"Jr.","given":"Salmon","family":"Landi","sequence":"additional","affiliation":[{"name":"Federal Institute Goiano, Rio Verde 75901-970, GO, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6649-4029","authenticated-orcid":false,"given":"\u00c9lida","family":"Margalho","sequence":"additional","affiliation":[{"name":"ISISE, Department of Civil Engineering, Azur\u00e9m Campus, University of Minho, 4800-058 Guimar\u00e3es, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2958-5079","authenticated-orcid":false,"given":"Nat\u00e1lia","family":"Homem","sequence":"additional","affiliation":[{"name":"Digital Transformation CoLab (DTx), Building 1, Campus of Azur\u00e9m, University of Minho, 4800-058 Guimar\u00e3es, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5161-2400","authenticated-orcid":false,"given":"M\u00e1rio","family":"Pereira","sequence":"additional","affiliation":[{"name":"Centre of Physics of Minho and Porto Universities (CF-UM-UP),  Azur\u00e9m Campus, University of Minho, 4800-058 Guimar\u00e3es, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1554-8779","authenticated-orcid":false,"given":"Manuel F. 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