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TiO2 is widely regarded as an eco-friendly and low-cost photocatalyst, but it is normally used as a dispersed powder, which must be separated from the treated water. Immobilizing it as a thin film removes that step at the cost of a much smaller accessible surface, so the performance of such films depends strongly on their composition. In this study, ultrathin TiO2\u2013CeO2 films containing 1, 2, and 3 wt % of CeO2 were prepared by sol\u2013gel dip coating, and the influence of CeO2 content on their structure and photocatalytic performance was investigated. Electron microscopy and elemental mapping show distributed cerium, consistent with a TiO2\u2013CeO2 nanocomposite. The degradation of methylene blue under UVA irradiation was used as a model reaction. The first-order rate constant passes through a maximum at 2 wt % CeO2, rising from 4.9 \u00d7 10\u20133 min\u20131 for pristine TiO2 films to 9.1 \u00d7 10\u20133 min\u20131, so that the \u223c30 nm smooth film approaches the performance of Degussa P25 suspended nanopowder at equal catalyst loading. The TiO2\u2013CeO2(2%) film retains its photoactivity over four consecutive cycles. These results show that sol\u2013gel TiO2\u2013CeO2 thin films are efficient and reusable immobilized photocatalysts for water purification.<\/jats:p>","DOI":"10.1021\/acsomega.6c07126","type":"journal-article","created":{"date-parts":[[2026,9,17]],"date-time":"2026-09-17T21:02:21Z","timestamp":1789678941000},"page":"57895-57905","source":"Crossref","is-referenced-by-count":0,"title":["Ultrathin TiO2\u2013CeO2 Composite\nFilms for Efficient Photocatalytic Methylene Blue Degradation"],"prefix":"10.1021","volume":"11","author":[{"given":"Mahsa","family":"Amiri","sequence":"first","affiliation":[{"name":"University of Tartu , , W. Ostwaldi 1 , ,","place":["Tartu, Estonia, 50411"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2321-3060","authenticated-orcid":true,"given":"Majid","family":"Ahmadi","sequence":"additional","affiliation":[{"name":"University of Groningen , , 4 Nijenborgh , ,","place":["Groningen, Netherlands, 9747 AG"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mahtab","family":"Salari Mehr","sequence":"additional","affiliation":[{"name":"University of Tartu , , W. 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