Hollow Square RodLike Microtubes Composed of Anatase Nanocuboids with Coexposed {100}, {010}, and {001} Facets for Improved Photocatalytic Performance
In this study, hollow square rodlike microtubes composed of anatase nanocuboids with coexposed {100}, {010}, and {001} facets were successfully synthesized via a mild hydrothermal treatment method in the presence of NH F by using layered H Ti O ribbons as the precursor. The precursor H Ti O ribbons...
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Veröffentlicht in: | ACS omega 2020-06, Vol.5 (23), p.14147-14156 |
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Hauptverfasser: | , , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | In this study, hollow square rodlike microtubes composed of anatase nanocuboids with coexposed {100}, {010}, and {001} facets were successfully synthesized via a mild hydrothermal treatment method in the presence of NH
F by using layered H
Ti
O
ribbons as the precursor. The precursor H
Ti
O
ribbons were prepared from H
/Na
ion-exchanged Na
Ti
O
. The suspension solution of protonated H
Ti
O
ribbons was adjusted to desired pH values (0.5-13.0) prior to hydrothermal treatment. The elongated direction of the microtubes is along the
axis, according to the profile of the H
Ti
O
ribbons. The transformation from staggered [Ti
O
]
sheets to hollow square rodlike microtubes contained the formation and recombination of the dispersed octahedral [Ti(OH)
(OH
)
]
monomers, the formation and growth of the initial anatase nuclei, and the reassembly of the anatase nanocuboids along the
-axis direction during the continuous hydrothermal process. The degradation rate of pH 0.5-TiO
was the highest at 1.66 × 10
min
, which was 1.3, 1.5, 2.0, 2.3, and 18.4 folds higher than that of pH 3.0-TiO
(1.27 × 10
min
), pH 7.0-TiO
(1.11 × 10
min
), pH 5.0-TiO
(0.83 × 10
min
), P25-TiO
(0.73 × 10
min
), and the blank sample (0.09 × 10
min
), respectively. Compared with P25-TiO
and the other anatase TiO
samples, pH 0.5-TiO
exhibited the best photocatalytic activity, which was mainly attributed to its larger proportion of {010} (or {100}) facets, smaller crystalline size, higher band gap, and larger specific surface area. |
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ISSN: | 2470-1343 2470-1343 |
DOI: | 10.1021/acsomega.0c01827 |