Directed Synthesis of Hierarchical Nanostructured TiO2 Catalysts and their Morphology-Dependent Photocatalysis for Phenol Degradation

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• 作者：Lu Liu ; Huajie Liu ; Ya-Ping Zhao ; Yuqiu Wang ; Yueqin Duan ; Guandao Gao ; Ming Ge ; Wei Chen
• 刊名：Environmental Science & Technology
• 出版年：2008
• 出版时间：April 1, 2008
• 年：2008
• 卷：42
• 期：7
• 页码：2342 - 2348
• 全文大小：4978K
• 年卷期：v.42,no.7(April 1, 2008)
• ISSN：1520-5851

文摘

Nanostructured TiO₂ with different hierarchical morphologies were synthesized via a warmly hydrothermal route. The properties of the products were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, N₂ adsorption, UV–vis spectroscopy, etc. Two of the products, TiO₂ 1D nanorods (one-dimensional rutile TiO₂ nanorods) and TiO₂ 3D_0D microspheres (three-dimensional anatase TiO₂ nanoparticle-assembled microspheres) exhibited superior photocatalytic effects on phenol degradation under UV illumination, compared with TiO₂ 3D_1D microspheres (three-dimensional rutile TiO₂ nanorods-assembled microspheres). Moreover, TiO₂ 3D_0D was superior to TiO₂ 1D, as indicated by a 30% higher mineralization of dissolved phenol. Dihydroxybenze, 4,4′-dihydroxybiphenyl, benzoquinone, maleic anhydride, etc. were identified as the degradation intermediates. The excellent catalytic effect was attributed to the structural features of TiO₂ 1D nanorods and TiO₂ 3D_0D microspheres, that is, a larger amount of surface active sites and a higher band gap energy resulted in more efficient decomposition of organic contaminants.