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Tailored preparation of titania with controllable phases of anatase and brookite by an alkalescent hydrothermal route

Paper ID Volume ID Publish Year Pages File Format Full-Text
55111 47040 2013 8 PDF Available
Title
Tailored preparation of titania with controllable phases of anatase and brookite by an alkalescent hydrothermal route
Abstract

Titanium dioxide (TiO2) with different ratio of anatase to brookite has been selectively synthesized by an alkalescent hydrothermal treatment of TiCl3 in the presence of different concentration of NaCl. The resulting powders have been characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), photoluminescence (PL) analysis, UV–vis diffuse reflectance spectra (DRS), and Brunauer–Emmett–Teller (BET) analysis. The contents of anatase and brookite have been successfully controlled by adjusting the NaCl concentration and NH4OH/H2O volume ratio. The photocatalytic activity of TiO2 has been assessed by the degradation of Rhodamine B in aqueous solution. The mixed-phase TiO2 exhibits higher activity than pure phase TiO2, and the product containing 53.4% brookite and 46.6% anatase shows the highest photocatalytic activity. This behavior is explained by the mixed-phase effect between anatase and brookite. A proposed formation process is discussed to interpret the evolution of the phases based on the effects of different NaCl concentration and NH4OH/H2O volume ratio.

Graphical abstractMixed-phase TiO2 with a tunable anatase-to-brookite ratio has been achieved via an alkalescent hydrothermal treatment of TiCl3 in the present of NaCl.Figure optionsDownload full-size imageDownload high-quality image (125 K)Download as PowerPoint slideHighlights► Titanium dioxide with different ratio of anatase to brookite has been selectively synthesized by an alkalescent hydrothermal treatment. ► The contents of anatase and brookite have been successfully controlled by adjusting the NaCl concentration and NH4OH/H2O volume ratio. ► The mixed-phase TiO2 exhibits higher activity than pure phase TiO2. ► A proposed formation process is discussed to interpret the evolution of the phases based on the effects of different NaCl concentration and NH4OH/H2O volume ratio.

Keywords
Anatase; Brookite; Photocatalytic activity; NaCl
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Tailored preparation of titania with controllable phases of anatase and brookite by an alkalescent hydrothermal route
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 201, 1 March 2013, Pages 151–158
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us