Mesoporous Titanium Dioxide (TiO2) with hierarchically 3D dendrimeric architectures: Formation mechanism and highly enhanced photocatalytic activity

被引:14
作者
Li, Xiao-Yun [1 ]
Chen, Li-Hua [1 ,2 ]
Rooke, Joanna Claire [1 ]
Deng, Zhao [2 ]
Hu, Zhi-Yi [2 ]
Wang, Shao-Zhuan [2 ]
Wang, Li [2 ]
Li, Yu [2 ]
Krief, Alain [1 ,3 ]
Su, Bao-Lian [1 ,2 ,4 ]
机构
[1] Univ Namur FUNDP, Lab Inorgan Mat Chem CMI, B-5000 Namur, Belgium
[2] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China
[3] Univ Namur FUNDP, Lab Supramol Mat Organ Chem, B-5000 Namur, Belgium
[4] Univ Cambridge, Dept Chem, Cambridge CB2 1EW, England
关键词
Hierarchically 3D dendrimeric; Mesoporous titania; Metal alkoxides; Self-formation; Photocatalytic activity; HIGH SURFACE-AREAS; ANATASE TIO2; SELF-FORMATION; THIN-FILMS; CRYSTALLINE; SILICA; OXIDE; STABILITY; BEADS; WATER;
D O I
10.1016/j.jcis.2012.11.014
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Mesoporous TiO2 with a hierarchically 3D dendrimeric nanostructure comprised of nanoribbon building units has been synthesized via a spontaneous self-formation process from various titanium alkoxides. These hierarchically 3D dendrimeric architectures can be obtained by a very facile, template-free method, by simply dropping a titanium butoxide precursor into methanol solution. The novel configuration of the mesoporous TiO2 nanostructure in nanoribbon building units yields a high surface area. The calcined samples show significantly enhanced photocatalytic activity and degradation rates owing to the mesoporosity and their improved crystallinity after calcination. Furthermore, the 3D dendrimeric architectures can be preserved after phase transformation from amorphous TiO2 to anatase or rutile, which occurs during calcination. In addition, the spontaneous self-formation process of mesoporous TiO2 with hierarchically 3D dendrimeric architectures from the hydrolysis and condensation reaction of titanium butoxide in methanol has been followed by in situ optical microscopy (OM), revealing the secret on the formation of hierarchically 3D dendrimeric nanostructures. Moreover, mesoporous TiO2 nanostructures with similar hierarchically 3D dendrimeric architectures can also be obtained using other titanium alkoxides. The porosities and nanostructures of the resultant products were characterized by SEM, TEM, XRD, and N-2 adsorption-desorption measurements. The present work provides a facile and reproducible method for the synthesis of novel mesoporous TiO2 nanoarchitectures, which in turn could herald the fabrication of more efficient photocatalysts. (C) 2012 Elsevier Inc. All rights reserved.
引用
收藏
页码:252 / 262
页数:11
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