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Surfactant-Free Synthesis of Single-Crystalline Bi 4 Ti 3 O 12 Nanosheets with Excellent Visible-Light Photocatalytic Activity

Catalysis Surveys from Asia(2019)

Cited 9|Views22
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Abstract
Single-crystalline Bi 4 Ti 3 O 12 nanosheets with a thickness less than 10 nm and a lateral size larger than 20 μm have successfully synthesized via a surfactant-free hydrothermal route by employing K 2 Ti 6 O 13 nanofibers prepared in advance as titanium sources. The as-prepared samples were characterized by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy (TEM), high-resolution TEM, and selected area electron diffraction, respectively. The results revealed that the single-crystalline Bi 4 Ti 3 O 12 nanosheets are dominated with (010) facets. In general, the slow exfoliation of TiO 6 octahedron lamella and the fast combination of the subnitrate radicals with the Bi 3+ ions situated in (010) planes induce the crystallization of the single-crystalline Bi 4 Ti 3 O 12 nanosheets. In addition, the as-prepared single-crystalline Bi 4 Ti 3 O 12 nanosheets propose a narrowed gap of ca. 2.41 eV and after modified by Pt-quantum-dots exhibit excellent visible-light photocatalytic activity. It is believed that the surfactant-free in the hydrothermal system induce more amount of surface state responsible for the narrowed gap and the excellent visible-light photocatalytic activity.
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Key words
Bi4Ti3O12 nanosheets, Photocatalytic degradation, Hydrothermal preparation
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