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The hydrothermal synthesis of mesoporous TiO2 with high crystallinity, thermal stability, large surface area, and enhanced photocatalytic activity

Paper ID Volume ID Publish Year Pages File Format Full-Text
43614 45979 2007 9 PDF Available
Title
The hydrothermal synthesis of mesoporous TiO2 with high crystallinity, thermal stability, large surface area, and enhanced photocatalytic activity
Abstract

Well-defined spherical mesoporous TiO2 was prepared from a poly(ethylene glycol)-poly(propylene glycol)-based triblock copolymer and titanium isopropoxide mixed with 2,4-pentanedione by using a simple sol–gel approach in aqueous solution. Hydrothermal treatment was performed to increase the crystallinity, thermal stability, surface area, and photocatalytic activity of the mesoporous TiO2. The hydrothermally treated mesoporous TiO2 materials were found to have a high crystallinity with a nanocrystalline anatase structure even in the as-synthesized state, whereas untreated materials were found to have an amorphous or semicrystalline phase prior to calcination at 300 °C. The surface area of hydrothermally treated mesoporous TiO2 was found to exceed 395 m2 g−1, whereas the areas of the untreated materials were less than 123 m2 g−1. The pore size distributions of the hydrothermally treated mesoporous TiO2 materials were found to be narrower than those of untreated materials; the average pore size increased from 5.7 to 10.1 nm with increases in the calcination temperature. The photocatalytic activity of hydrothermally treated mesoporous TiO2 is significantly higher than the activities of untreated materials, with a maximum decomposition rate that is three times faster than that of a commercial TiO2, P25. The high photocatalytic activity of mesoporous TiO2 is due to the large surface area and high crystallinity with a nanocrystalline anatase that is induced by the hydrothermal treatment.

Graphical abstractThe hydrothermal synthesis of mesoporous TiO2 with high crystallinity, thermal stability, and large surface was synthesized. The photocatalytic activity is higher than that of commercial TiO2 induced by the high crystallinity, large surface area, and small crystallite anatase. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Mesoporous TiO2; Hydrothermal treatment; High crystallinity; Surface area; Photocatalytic activity
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The hydrothermal synthesis of mesoporous TiO2 with high crystallinity, thermal stability, large surface area, and enhanced photocatalytic activity
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 323, 30 April 2007, Pages 110–118
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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