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In a typical microwave synthesis, TiO2 nanomaterials were simultaneously produced in powder form and also directly covering cork substrates. The TiO2 nanopowder was analyzed by X-ray diffraction (XRD), Raman spectroscopy and transmission electron microscopy (TEM), revealing that the solvothermal microwave synthesis resulted only in the TiO2 anatase phase. From Fourier-transform infrared spectroscopy (FTIR), cork\u2019s organic species, along with bands of TiO2, were detected. UV\u2013VIS absorption spectrum revealed an absorption extension to the visible region, since a brown powdered TiO2 product was obtained. Very fine nanoparticles were observed displaying a nearly spherical shape that agglomerates in larger particles. These larger particles fully covered the surface of the honeycomb cork cells, originating TiO2 functionalized cork platforms. The TiO2 functionalized substrates were further tested as floating photocatalysts and their photocatalytic activity was assessed from rhodamine B degradation under solar simulating light and natural sunlight. Reusability tests were also performed under natural sunlight. The strategy applied in this research work allowed the production of green and low-cost cork platforms based on TiO2 photoactive materials with the ability to purify polluted water under natural sunlight.<\/jats:p>","DOI":"10.3390\/su14159645","type":"journal-article","created":{"date-parts":[[2022,8,9]],"date-time":"2022-08-09T04:16:55Z","timestamp":1660018615000},"page":"9645","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Floating TiO2-Cork Nano-Photocatalysts for Water Purification Using Sunlight"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9600-453X","authenticated-orcid":false,"given":"Maria Leonor","family":"Matias","sequence":"first","affiliation":[{"name":"CENIMAT|i3N, Department of Materials Science, School of Science and Technology, NOVA University Lisbon and CEMOP\/UNINOVA, 2829-516 Caparica, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3527-7857","authenticated-orcid":false,"given":"Maria","family":"Morais","sequence":"additional","affiliation":[{"name":"CENIMAT|i3N, Department of Materials Science, School of Science and Technology, NOVA University Lisbon and CEMOP\/UNINOVA, 2829-516 Caparica, Portugal"}]},{"given":"Ana","family":"Pimentel","sequence":"additional","affiliation":[{"name":"CENIMAT|i3N, Department of Materials Science, School of Science and Technology, NOVA University Lisbon and CEMOP\/UNINOVA, 2829-516 Caparica, Portugal"}]},{"given":"Francisco X.","family":"Vasconcelos","sequence":"additional","affiliation":[{"name":"CENIMAT|i3N, Department of Materials Science, School of Science and Technology, NOVA University Lisbon and CEMOP\/UNINOVA, 2829-516 Caparica, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7432-8725","authenticated-orcid":false,"given":"Ana S.","family":"Reis Machado","sequence":"additional","affiliation":[{"name":"LAQV-REQUIMTE, Department of Chemistry, NOVA School of Science and Technology, Universidade NOVA de Lisboa, Campus de Caparica, 2829-516 Caparica, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0424-3248","authenticated-orcid":false,"given":"Joana","family":"Rodrigues","sequence":"additional","affiliation":[{"name":"Physics Department and I3N, Aveiro University, Campus Universit\u00e1rio de Santiago, 3810-193 Aveiro, Portugal"}]},{"given":"Elvira","family":"Fortunato","sequence":"additional","affiliation":[{"name":"CENIMAT|i3N, Department of Materials Science, School of Science and Technology, NOVA University Lisbon and CEMOP\/UNINOVA, 2829-516 Caparica, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1997-7669","authenticated-orcid":false,"given":"Rodrigo","family":"Martins","sequence":"additional","affiliation":[{"name":"CENIMAT|i3N, Department of Materials Science, School of Science and Technology, NOVA University Lisbon and CEMOP\/UNINOVA, 2829-516 Caparica, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3115-6588","authenticated-orcid":false,"given":"Daniela","family":"Nunes","sequence":"additional","affiliation":[{"name":"CENIMAT|i3N, Department of Materials Science, School of Science and Technology, NOVA University Lisbon and CEMOP\/UNINOVA, 2829-516 Caparica, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2022,8,5]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"2997","DOI":"10.1016\/j.watres.2010.02.039","article-title":"Recent developments in photocatalytic water treatment technology: A review","volume":"44","author":"Jin","year":"2010","journal-title":"Water Res."},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Fernandes, E.M., Pires, R.A., and Reis, R.L. 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