物理化学学报Issue(2)：360-368,9.DOI:10.3866/PKU.WHXB201412243
耐高温核/壳结构TiO2/SiO2复合气凝胶的制备及其光催化性能
Preparation of Heat-Resistant, Core/Shell Nanostructured TiO2/SiO2 Composite Aerogels and Their Photocatalytic Properties
摘要
Abstract
Core/shel nanostructured monolithic TiO2/SiO2 composite aerogels were prepared by the aniline-acetone in situ water formation sol-gel method. Titanium(IV) n-butoxide was used as a precursor fol owed by supercritical modification with partial y hydrolyzed titanium alkoxide and tetraethoxysilane during ethanol supercritical fluid drying. The obtained composite aerogel showed excel ent mechanical strength with a Young′s modulus of 4.5 MPa. The composite aerogel exhibited excel ent heat resistance. After heat treatment at 1000 °C 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 excel ent photocatalytic performance during the degradation of methylene blue after heat treatment at 1000 °C. Its excel ent photocatalytic property is attributed to its high specific surface area and the smal particle size of the composite aerogel after heat treatment at 1000 ° C. The enhanced heat resistance, mechanical strength, and photocatalytic performance makes the obtained core/shel nanostructured TiO2/SiO2 composite aerogel a promising candidate for photocatalytic applications.关键词
TiO2/SiO2复合气凝胶/核/壳纳米结构/原位生成水/超临界修饰/耐高温/光催化Key words
TiO2/SiO2 composite aerogel/Core/shel nanostructure/In situ water formation/Supercritical modification/Heat resistance/Photocatalysis分类
化学化工引用本文复制引用
祖国庆,沈军,王文琴,邹丽萍,许维维,张志华..耐高温核/壳结构TiO2/SiO2复合气凝胶的制备及其光催化性能[J].物理化学学报,2015,(2):360-368,9.基金项目
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).国家自然科学基金(51172163, U1230113),国家科技支撑计划(2013BAJ01B01),国家高技术研究发展计划项目(863)(2013AA031801),上海市纳米科委专项基金(11nm0501600,12nm0503001)资助 （51172163, U1230113）
