Journal
FERROELECTRICS
Volume 547, Issue 1, Pages 10-20Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00150193.2019.1592478
Keywords
Sol-gel process; TiO2; SiO2 membrane materials; surface area; porosity
Funding
- National and Science Foundation Council of China [21573171]
- Shaanxi Province Key Research and Development Plan of China [2017GY-121]
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The study presents the synthesis of TiO2/SiO2 membrane materials using sol-gel method by hydrolysis of tetrabutyl titanate (TBOT) with ethanol and water mixture as titania source, tetraethylorthosilicate (TEOS) and methyltriethoxysilane (MTES) as silica source. The microstructure of the composites were characterized by X-ray diffraction (XRD), fourier transform infrared (FTIR) spectra, scanning electron microscopy (SEM), energy dispersive spectrum (EDS), N-2 absorption-adsorption measurement and thermogravimetric-differential thermogravimetric (TG-DTG) analysis. The as obtained TiO2/SiO2 membrane materials showed the existence of Si-O-Ti, which indicates that the SiO2 is chemically bonded with the TiO2 particles. The TiO2 nanoparticles have entered into the channels of SiO2 network. The TiO2-doping decreased the mean pore diameter, and increased the surface area and porosity of SiO2 materials. The TiO2/SiO2 membrane materials with Ti/Si molar ratio of 0.4 exhibit a large BET surface area (up to 284.04 m(2)/g) and total pore volume (up to 0.272 cm(3)/g), as well as a mean pore diameter of about 2.49 nm.
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