Preparation and characterization of SiO{sub 2}/TiO{sub 2} composite microspheres with microporous SiO{sub 2} core/mesoporous TiO{sub 2} shell

Journal Article · Wed Jun 15 04:00:00 EDT 2005 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2005.03.024· OSTI ID:20725966

Li, Zhao ^[1]; Jiaguo, Yu ^[1]; Bei, Cheng ^[1]

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1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Luoshi road 122, Wuhan City, Hubei province 430070 (China)

SiO{sub 2}/TiO{sub 2} composite microspheres with microporous SiO{sub 2} core/mesoporous TiO{sub 2} shell structures were prepared by hydrolysis of titanium tetrabutylorthotitanate (TTBT) in the presence of microporous silica microspheres using hydroxypropyl cellulose (HPC) as a surface esterification agent and porous template, and then dried and calcined at different temperatures. The as-prepared products were characterized with differential thermal analysis and thermogravimetric (DTA/TG), scanning electron microscopy (SEM), X-ray diffraction (XRD), nitrogen adsorption. The results showed that composite particles were about 1.8{mu}m in diameter, and had a spherical morphology and a narrow size distribution. Uniform mesoporous titania coatings on the surfaces of microporous silica microspheres could be obtained by adjusting the HPC concentration to an optimal concentration of about 3.2mmolL{sup -1}. The anatase and rutile phase in the SiO{sub 2}/TiO{sub 2} composite microspheres began to form at 700 and 900 deg. C, respectively. At 700 deg. C, the specific surface area and pore volume of the SiO{sub 2}/TiO{sub 2} composite microspheres were 552 and 0.652mLg{sup -1}, respectively. However, at 900 deg. C, the specific surface area and pore volume significantly decreased due to the phase transformation from anatase to rutile.

• OSTI ID: 20725966
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 6 Vol. 178; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
COATINGS
DIFFERENTIAL THERMAL ANALYSIS
HYDROLYSIS
MICROSPHERES
PHASE TRANSFORMATIONS
POROUS MATERIALS
RUTILE
SCANNING ELECTRON MICROSCOPY
SILICA
SILICON OXIDES
SPECIFIC SURFACE AREA
SPHERICAL CONFIGURATION
THERMAL GRAVIMETRIC ANALYSIS
TITANATES
TITANIUM COMPOUNDS
TITANIUM OXIDES
X-RAY DIFFRACTION