Enhancing effects of water content and ultrasonic irradiation on the photocatalytic activity of nano-sized TiO2 powders

Jimmy C. YU, Jiaguo YU, Lizhi ZHANG, Wing Kei HO

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166 Citations (Scopus)

Abstract

A simple method for preparing highly photoactive nano-sized TiO2 photocatalyst with anatase and brookite phase was developed by hydrolysis of titanium tetraisopropoxide in pure water or the EtOH/H2O mixed solution under ultrasonic irradiation. The prepared TiO2 powders were characterized by differential thermal analysis (DTA), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and BET surface areas. The photocatalytic activity was evaluated by the photocatalytic oxidation of acetone in air. The results showed that the photocatalytic activity of TiO2 powders prepared by this method from pure water or the EtOH/H2O mixed solutions with the molar ratio of EtOH/H2O = 1 exceeded that of Degussa P-25. The molar ratios of EtOH/H2O obviously influenced the crystallization, crystallite size, BET surface areas and photocatalytic activity of the prepared TiO2 powders. Ultrasonic irradiation obviously enhanced the photocatalytic activity of TiO2 powders whether the solvent is pure water or the EtOH/H2O mixed solutions. This may be ascribed to the fact that ultrasonic irradiation enhances hydrolysis of titanium alkoxide and crystallization of TiO2 gel. Copyright © 2002 Elsevier Science B.V. All rights reserved.
Original languageEnglish
Pages (from-to)263-271
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume148
Issue number1-3
DOIs
Publication statusPublished - 2002

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Powders
Water content
Ultrasonics
Irradiation
Crystallization
Water
Hydrolysis
Crystallite size
Photocatalysts
Acetone
Titanium
Differential thermal analysis
X ray photoelectron spectroscopy
Gels
Transmission electron microscopy
X ray diffraction
Oxidation
Air
titanium dioxide

Bibliographical note

Yu, J. C.; Yu, J. G.; Zhang, L. Z.; Ho, W. K. (2002). Enhancing effects of water content and ultrasonic irradiation on the photocatalytic activity of nano-sized TiO2 powders. Journal of Photochemistry and Photobiology A: Chemistry, 148(103), 263-271. doi: 10.1016/S1010-6030(02)00052-7

Keywords

  • TiO2 nano-sized powders
  • Sol–gel method
  • Ultrasonic
  • Water content
  • Photocatalytic activity