Solvothermal Synthesis of TiO2 Nanocrystal Colloids from Peroxotitanate Complex Solution and Their Photocatalytic Activities

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• 作者：Jianhua Liao ; Liyi Shi ; Shuai Yuan ; Yin Zhao ; Jianhui Fang
• 刊名：Journal of Physical Chemistry C
• 出版年：2009
• 出版时间：October 29, 2009
• 年：2009
• 卷：113
• 期：43
• 页码：18778-18783
• 全文大小：272K
• 年卷期：v.113,no.43(October 29, 2009)
• ISSN：1932-7455

文摘

TiO₂ nanocrystal colloids with different shapes and sizes have been prepared from a peroxotitanate complex solution starting from titanium(IV) sulfate and hydrogen peroxide (H₂O₂) in water/alcohol media by a solvothermal process. The TiO₂ nanocrystals were characterized by transmission electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, FT-IR spectroscopy, zeta potential, and nitrogen adsorption. The TiO₂ nanocrystal colloids prepared by a solvothermal process at 120 °C show a highly crystallized anatase phase. The particle sizes decreased with the increase of the alcohol/water ratio. The shapes of the particles have been controlled from the “rodlike” in pure water solvent to a “rectangular” shape in pure ethanol solvent. The photocatalytic activities of TiO₂ nanocrystals were evaluated by the degradation of phenol. The photocatalytic activity of the anatase nanocrystal was closely related to the particle diameter. In addition, the possible growth mechanism of this anatase was illustrated.