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Acta Phys. Chim. Sin.  2015, Vol. 31 Issue (2): 360-368    DOI: 10.3866/PKU.WHXB201412243
CATALYSIS AND SURFACE SCIENCE     
Preparation of Heat-Resistant, Core/Shell Nanostructured TiO2/SiO2 Composite Aerogels and Their Photocatalytic Properties
ZU Guo-Qing, SHEN Jun, WANG Wen-Qin, ZOU Li-Ping, XU Wei-Wei, ZHANG Zhi-Hua
Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, Pohl Institute of Solid State Physics, Tongji University, Shanghai 200092, P. R. China
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Abstract  

Core/shell nanostructured monolithic TiO2/SiO2 composite aerogels were prepared by the anilineacetone in situ water formation sol-gel method. Titanium(IV) n-butoxide was used as a precursor followed by supercritical modification with partially hydrolyzed titanium alkoxide and tetraethoxysilane during ethanol supercritical fluid drying. The obtained composite aerogel showed excellent mechanical strength with a Young's modulus of 4.5 MPa. The composite aerogel exhibited excellent heat resistance. After heat treatment at 1000 ℃ its linear shrinkage decreased from 31% for the TiO2 aerogel to 10% for the composite aerogel. The specific surface area increased from 31 m2 ·g-1 for the TiO2 aerogel to 143 m2 ·g-1 for the composite aerogel. The composite aerogel exhibited excellent photocatalytic performance during the degradation of methylene blue after heat treatment at 1000 ℃. Its excellent photocatalytic property is attributed to its high specific surface area and the small particle size of the composite aerogel after heat treatment at 1000 ℃. The enhanced heat resistance, mechanical strength, and photocatalytic performance makes the obtained core/shell nanostructured TiO2/SiO2 composite aerogel a promising candidate for photocatalytic applications.



Key wordsTiO2/SiO2 composite aerogel      Core/shell nanostructure      In situ water formation      Supercritical modification      Heat resistance      Photocatalysis     
Received: 13 November 2014      Published: 24 December 2014
MSC2000:  O648  
Fund:  

The project was supported by the National Natural Science Foundation of China (51172163, U1230113), National Key Technology R&D Program of China (2013BAJ01B01), National High Technology Research and Development Program of China (863) (2013AA031801), and Shanghai Committee of Science and Technology (11nm0501600, 12nm0503001).

Corresponding Authors: ZU Guo-Qing, SHEN Jun     E-mail: zuguoqing863@gmail.com;shenjun67@tongji.edu.cn
Cite this article:

ZU Guo-Qing, SHEN Jun, WANG Wen-Qin, ZOU Li-Ping, XU Wei-Wei, ZHANG Zhi-Hua. Preparation of Heat-Resistant, Core/Shell Nanostructured TiO2/SiO2 Composite Aerogels and Their Photocatalytic Properties. Acta Phys. Chim. Sin., 2015, 31(2): 360-368.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB201412243     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2015/V31/I2/360

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