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AuthorQamar, Mohammad
AuthorZaidi, Shabi Abbas
AuthorRafatullah, Mohd
AuthorQutob, Mohammad
AuthorKim, Sun Jae
AuthorDrmosh, Qasem A.
Available date2022-08-15T04:39:02Z
Publication Date2022-07-01
Publication NameCatalysts
Identifierhttp://dx.doi.org/10.3390/catal12070702
CitationQamar, M.; Zaidi, S.A.; Rafatullah, M.; Qutob, M.; Kim, S.-J.; Drmosh, Q.A. Role of Post-Hydrothermal Treatment on the Microstructures and Photocatalytic Activity of TiO2-Based Nanotubes. Catalysts 2022, 12, 702. https://doi.org/10.3390/catal12070702
URIhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85133718910&origin=inward
URIhttp://hdl.handle.net/10576/33031
AbstractThe present study demonstrates the thermal stability and photocatalytic activity of TiO2-based nanotubes with respect to post-hydrothermal treatment. Titanate nanotubes were synthesized by adapting an alkali hydrothermal method from TiO2sol using NaOH as a catalyst. The effect of post-hydrothermal heating on the properties—such as structure, morphology, textural properties, and activity—of as-synthesized one-dimensional titania nanostructure is investigated in detail. The characterizations are carried out using SEM, EDX, TEM, XRD, and a BET surface area analyzer. When heated in the presence of water in an autoclave, the protonated titanate phase of the nanotubes converts to anatase phase. Meanwhile, the tubular morphology is gradually lost as the post-hydrothermal heating duration increases. The photocatalytic activity was assessed utilizing the photo-oxidation of an amaranth dye. It is discerned that the as-prepared nanotubes are photocatalytically inactive but become active after post-hydrothermal processing. The activity trend follows the formation of the active phase—the titanate phase crystallizes into a photocatalytically-active anatase phase during post-hydrothermal heating. The effect of experimental parameters, such as reaction pH, dye concentration, and amount of catalyst, on the dye removal is studied. The findings also highlight that the role of holes/OH•− is more prominent as compared to conduction band electron/O2•− for the removal of the dye. In addition, the photocatalyst exhibited excellent stability and reusability.
SponsorTheauthorswouldliketoexpresstheir appreciation to Ministry of Higher Education Malaysia for Fundamental Research Grant SchemewithProject Code: FRGS/1/2019/STG07/USM/02/12.
Languageen
PublisherMDPI
Subjecthydrothermal synthesis
nanotubes
photocatalysis
titanate
titanium dioxide
TitleRole of Post-Hydrothermal Treatment on the Microstructures and Photocatalytic Activity of TiO2-Based Nanotubes
TypeArticle
Issue Number7
Volume Number12
ESSN2073-4344
dc.accessType Open Access


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