Citation: 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[J]. Acta Physico-Chimica Sinica, ;2015, 31(2): 360-368. doi: 10.3866/PKU.WHXB201412243 shu

Preparation of Heat-Resistant, Core/Shell Nanostructured TiO₂/SiO₂ Composite Aerogels and Their Photocatalytic Properties

1.
Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, Pohl Institute of Solid State Physics, Tongji University, Shanghai 200092, P. R. China

Received Date: 13 November 2014
Available Online: 24 December 2014
Fund Project: 国家自然科学基金(51172163, U1230113) (51172163, U1230113) 国家科技支撑计划(2013BAJ01B01) (2013BAJ01B01) 国家高技术研究发展计划项目(863) (2013AA031801) (863) (2013AA031801) 上海市纳米科委专项基金(11nm0501600, 12nm0503001)资助 (11nm0501600, 12nm0503001)

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.
- TiO₂/SiO₂ composite aerogel,
- Core/shell nanostructure,
- In situ water formation,
- Supercritical modification,
- Heat resistance,
- Photocatalysis
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沈阳化工大学材料科学与工程学院沈阳 110142

Preparation of Heat-Resistant, Core/Shell Nanostructured TiO2/SiO2 Composite Aerogels and Their Photocatalytic Properties

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通讯作者: 陈斌, bchen63@163.com

Preparation of Heat-Resistant, Core/Shell Nanostructured TiO₂/SiO₂ Composite Aerogels and Their Photocatalytic Properties