Methylene Blue Photodegradation onto TiO2 Thin Films Sensitized with Curcumin: DFT and Experimental Study

Simple item page
dc.catalogadorgrr
dc.contributor.authorVallejo, William
dc.contributor.authorMeza, Maria
dc.contributor.authorDuran, Freider
dc.contributor.authorDiaz-Uribe, Carlos
dc.contributor.authorQuiñones, Cesar
dc.contributor.authorSchott Verdugo, Eduardo
dc.contributor.authorZarate, Ximena
dc.date.accessioned2025-11-14T15:33:28Z
dc.date.available2025-11-14T15:33:28Z
dc.date.issued2025
dc.description.abstractTitanium dioxide (TiO2) thin films sensitized with curcumin were fabricated to investigate the influence of sensitization on their spectroscopic, optical, and photocatalytic properties. TiO2 films were prepared using different curcumin concentrations and characterized by FTIR, UV–Vis, and diffuse reflectance spectroscopy (DRS). The adsorption kinetics of curcumin on TiO2 were analyzed, and the photocatalytic performance was evaluated through methylene blue (MB) photodegradation under visible-light irradiation. FTIR spectra confirmed the successful anchoring of curcumin onto the TiO2 surface, while optical characterization revealed a significant enhancement in visible-light absorption. The band gap decreased from 3.2 eV (pure TiO2) to 1.8 eV (curcumin-sensitized TiO2). Furthermore, the curcumin adsorption onto semiconductor data fitted the pseudo-second-order kinetic model, yielding a maximum adsorption capacity of 12.0 mg·g−1. Density Functional Theory(DFT) calculations indicated that ligand-to-metal charge transfer (LMCT) transitions are responsiblefor the improved visible-light response. Photocatalytic tests demonstrated that all curcumin-sensitized TiO2 films were active under visible irradiation, confirming curcumin as an effective natural sensitizer for enhancing TiO2-based photocatalytic coatings.
dc.fechaingreso.objetodigital2025-11-14
dc.format.extent15 páginas
dc.fuente.origenORCID
dc.identifier.doi10.3390/chemistry7060177
dc.identifier.eissn2624-8549
dc.identifier.eissn2624-8549
dc.identifier.urihttps://doi.org/10.3390/chemistry7060177
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/107000
dc.information.autorucEscuela de Química; Schott Verdugo, Eduardo; 0000-0002-2546-304X; 1020229
dc.issue.numero6
dc.language.isoen
dc.nota.accesocontenido completo
dc.pagina.inicio177
dc.revistaChemistry
dc.rightsacceso abierto
dc.rights.licenseCC BY 4.0 Attribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectHeterogeneous photocatalysis
dc.subjectTiO2
dc.subjectSensitization
dc.subjectCurcumin
dc.subject.ddc510
dc.subject.deweyMatemática física y químicaes_ES
dc.titleMethylene Blue Photodegradation onto TiO2 Thin Films Sensitized with Curcumin: DFT and Experimental Study
dc.typeartículo
dc.volumen7
sipa.codpersvinculados1020229
sipa.trazabilidadORCID;2025-11-10
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
chemistry-07-00177.pdf
Size:
2.55 MB
Format:
Adobe Portable Document Format
Description:
Download
Collections
Artículos de revistas