期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 354, 期 1, 页码 196-201出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2010.10.023
关键词
Core/shell; Hybrid silica particles; Anatase titania shell; Click reaction; Photocatalyst
资金
- National Science Foundation of China [20974023, 21034003, 51073040]
- National Science Foundation for Distinguished Young Scholars of China [50525310]
- Ministry of Education of China [707023]
The monodisperse hybrid silica particles (h-SiO2) were firstly prepared by a modified sol-gel process and the surface was modified in situ with double bonds, then abundant carboxyl moieties were introduced onto the surface of the silica core via thiol-ene click reaction. Afterward, the h-SiO2/TiO2 core/shell microspheres were prepared by hydrolysis of titanium tetrabutoxide (TBOT) via sol-gel process in mixed ethanol/acetonitrile solvent, in which the activity of TBOT could be easily controlled. The carboxyl groups on the surface of silica particles promote the formation of a dense and smooth titania layer under well control, and the layer thickness of titania could be tuned from 12 to 100 nm. The well-defined h-SiO2/TiO2 core/shell structures have been confirmed by electron microscopy and X-ray photoelectron spectroscopy studies. After calcination at 500 degrees C for 2 h, the amorphous TiO2 layer turned into anatase titania. These anatase titania-coated silica particles showed good photocatalytic performance in degradation of methyl orange aqueous solution under UV light. (C) 2010 Elsevier Inc. All rights reserved.
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