An Approach for Controllable Synthesis of Different-Phase Titanium Dioxide Nanocomposites with Peroxotitanium Complex as Precursor

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• 作者：Yang Zhang ; Liangzhuan Wu ; Qinghui Zeng ; Jinfang Zhi
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：October 23, 2008
• 年：2008
• 卷：112
• 期：42
• 页码：16457-16462
• 全文大小：242K
• 年卷期：v.112,no.42(October 23, 2008)
• ISSN：1932-7455

文摘

In this paper, we describe a systemic approach for the preparation of different-phase titanium dioxide nanocomposites with peroxotitanium complex (PTC) as a precursor in aqueous solution by a low-temperature process. Three phases (anatase, rutile, and brookite) of TiO₂ nanoparticles were prepared by refluxing the PTC precursor at different pH values at 100 °C and ambient pressure. At pH = 0, acicular rutile-phase nanoparticles were prepared, while at a pH of about 1, a stable milk white sol that contains about 63% brookite phase was obtained; the brookite particles are mainly irregular quadrate. Furthermore, the spherical and spindle anatase nanoparticles were prepared from the precursor with pH = 3 and 6, respectively. The influence of the different concentration of the peroxide on the products was also investigated. It is noticed that there was an optimum H₂O₂/Ti molar ratio for different phase formation. Finally, the photocatalytic properties of different products were measured by decomposing methylene blue. The spherical anatase phase showed higher photocatalytic degradation rates for methylene blue than others.