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The materials were prepared by co\u2010precipitation from an aqueous solution of iron and indium nitrates and extensively characterized with a combination of techniques. XRD analysis proved the formation of the desired In<jats:sub>x<\/jats:sub>Fe<jats:sub>y<\/jats:sub>O<jats:sub>3<\/jats:sub> solid solutions for Fe content in the range 5\u201325\u2009mol%. UV\u2010Vis absorption analysis showed that the substitution of In with Fe in the crystalline structure led to the anticipated gradual decrease of the band gap values compared to In<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub>. The obtained semiconductors were tested as photocatalysts for the degradation of model organic pollutants (phenol and methylene blue) in water. Among the In<jats:sub>x<\/jats:sub>Fe<jats:sub>y<\/jats:sub>O<jats:sub>3<\/jats:sub> solid solutions, In<jats:sub>1.7<\/jats:sub>Fe<jats:sub>0.3<\/jats:sub>O<jats:sub>3<\/jats:sub> displayed the highest photocatalytic activity in the degradation of the selected probe molecules under UV and visible radiation. Remarkably, In<jats:sub>1.7<\/jats:sub>Fe<jats:sub>0.3<\/jats:sub>O<jats:sub>3<\/jats:sub> showed a significantly enhanced activity under visible light compared to monometallic indium oxide and iron oxide, and to the benchmark TiO<jats:sub>2<\/jats:sub> P25. This demonstrates that our strategy consisting in engineering the band gap by tuning the composition of In<jats:sub>x<\/jats:sub>Fe<jats:sub>y<\/jats:sub>O<jats:sub>3<\/jats:sub> solid solutions was successful in improving the photocatalytic performance under visible light. Additionally, In<jats:sub>1.7<\/jats:sub>Fe<jats:sub>0.3<\/jats:sub>O<jats:sub>3<\/jats:sub> fully retained its photocatalytic activity upon reuse in four consecutive cycles.<\/jats:p>","DOI":"10.1002\/cssc.202401180","type":"journal-article","created":{"date-parts":[[2024,9,10]],"date-time":"2024-09-10T13:05:13Z","timestamp":1725973513000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Indium\u2010Iron Oxide Nanosized Solid Solutions as Photocatalysts for the Degradation of Pollutants under Visible Radiation"],"prefix":"10.1002","volume":"18","author":[{"given":"Damiano","family":"Cani","sequence":"first","affiliation":[{"name":"Centre for Surface Chemistry and Catalysis University of Leuven (KU Leuven)  Kasteelpark Arenberg 23 3001 Heverlee Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Timo","family":"Cuyvers","sequence":"additional","affiliation":[{"name":"Centre for Surface Chemistry 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