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Nanoparticulate Double-Heterojunction Photocatalysts Comprising TiO2(Anatase)/WO3/TiO2(Rutile) with Enhanced Photocatalytic Activity toward the Degradation of Methyl Orange under Near-Ultraviolet and Visible Light
Unidad Académica de Ciencias Químicas, Universidad Autónoma de Zacatecas, Campus Universitario Siglo XXI, km. 6 Carr. Zacatecas-Guadalajara s/n Ejido La Escondida, Zacatecas, Mexico.
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0003-2243-5251
Facultad de Ciencias Químicas, Universidad Autnoma de San Luis Potosí, Av. Manuel Nava #6, San Luis Potosí, Mexico.
División de Ciencias e Ingenieŕa, Universidad de Guanajuato, León, Guanajuato, Mexico.
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2021 (English)In: ACS Omega, E-ISSN 2470-1343, Vol. 6, no 18, p. 11840-11848Article in journal (Refereed) Published
Abstract [en]

Nanoparticulate double-heterojunction photocatalysts comprising TiO2(Anatase)/WO3/TiO2(Rutile) were produced by a sol–gel method. The resulting photocatalysts exhibit clear synergistic effects when tested toward the degradation of methyl orange under both UV and visible light. Kinetic studies indicate that the degradation rate on the best double-heterojunction photocatalyst (10 wt % WO3-TiO2) depends mainly on the amount of dye concentration, contrary to pure oxides in which the degradation rate is limited by diffusion-controlled processes. The synergistic effects were confirmed through systematic and careful studies including holes and OH radical formation, X-ray diffraction, electron microscopy, elemental analysis, UV–vis diffuse reflectance spectroscopy, and surface area analysis. Our results indicate that the successful formation of a double heterojunction in the TiO2(Anatase)/WO3/TiO2(Rutile) system leads to enhanced photoactivity when compared to individual oxides and commercial TiO2 P25.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2021. Vol. 6, no 18, p. 11840-11848
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:umu:diva-184134DOI: 10.1021/acsomega.0c06054ISI: 000651520800006PubMedID: 34056338Scopus ID: 2-s2.0-85106563245OAI: oai:DiVA.org:umu-184134DiVA, id: diva2:1563080
Funder
Swedish Research Council, 2018-03937Olle Engkvists stiftelse, 186-0637Available from: 2021-06-09 Created: 2021-06-09 Last updated: 2022-01-10Bibliographically approved

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Fan, JunpengGracia-Espino, Eduardo

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