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Study on the shape control and photocatalytic activity of high-energy anatase titania

Paper ID Volume ID Publish Year Pages File Format Full-Text
47180 46462 2010 8 PDF Available
Title
Study on the shape control and photocatalytic activity of high-energy anatase titania
Abstract

In the present work, high-energy TiO2 photocatalysts with exposed {0 0 1} facets were tailored by hydrothermal reaction of tetrabutyl titanate (50 g) and HF solution at 200 °C for 24 h. The photocatalysts were characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, nitrogen adsorption–desorption isotherms and X-ray photoelectron spectroscopy. The photocatalytic activity of the photocatalyst was evaluated by a photoluminescence technique using coumarin as a probe molecule. It shows that, with increase in the amount of HF, the shape of TiO2 evolves from octahedral bipyramid to nanosheet and the percentage of exposed high-energy {0 0 1} facets increases. The photocatalytic activity of the as-prepared high-energy anatase nanocrystals is positively related to the percentage of exposed {0 0 1} facets. When the amount of HF is more than 12 mL, the photocatalytic activity of anatase TiO2 nanosheets is high than that of P25. The high photocatalytic activity of the high-energy anatase TiO2 nanocrystals is ascribed to the synergetic effect of exposed high reactive {0 0 1} facets and surface fluorination. However, high concentrated HF (20 mL) results in the formation of cubic TiOF2, which shows very poor photocatalytic activity.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights▶ The shape of anatase TiO2 evolves from octahedral bipyramid to nanosheet. ▶ The percentage of exposed high-energy {0 0 1} facets was tailored from 6 to 96. ▶ Photoreactivity is positively related to the percentages of exposed {0 0 1} facets. ▶ Fluoride plays an important role on the photoreactivity of high-energy TiO2. ▶High concentrated HF results in the formation of poorly photoreactive TiOF2.

Keywords
Titania; Fluoride; Photocatalysis; Photoluminescence; High-energy facet
First Page Preview
Study on the shape control and photocatalytic activity of high-energy anatase titania
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 100, Issues 1–2, 11 October 2010, Pages 378–385
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis