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Synthesis of APTMS-Functionalized SiO2/TiO2 Transparent Film Using Peroxo Titanic Acid Refluxed Solution for Formaldehyde Removal

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Abstract

Amine-functionalized SiO2/TiO2 photocatalytic films have been synthesized using the peroxo titanic acid (PTA) approach coupled with the sol-gel dip-coating method. The 3-aminopropyl-trimethoxysilane (APTMS) and methyltrimethoxysilane (MTMOS) were employed as the amine functional groups and silica precursor. The effects of the ratio of APTMS/MTMOS, PTA refluxed time, and pH of prepared sol on the characteristics and the formaldehyde degradation efficiency were investigated. Physicochemical properties of prepared photocatalysts were characterized with nitrogen adsorption–desorption isotherm measurement, SEM, X-ray diffraction (XRD), UV-vis spectrophotometer, and Fourier transform infrared (FTIR) spectroscopy. The XRD and FTIR results indicated that the obtained photocatalysts consisted of –NH2 groups, SiO2, and anatase TiO2. The photocatalytic films showed high transmittance of 80–90% in the visible light region. The obtained film prepared with the APTMS/MTMOS ratio of 0.03, pH of 1.8, and 10 h of refluxed time possessed high specific surface area (604.0 m2 g−1) and 85% formaldehyde degradation efficiency. The enhancement of formaldehyde degradation efficiency was observed when increasing the PTA refluxed time. The repeatability of photocatalytic film was also tested, and the degradation efficiency was 92.0% of initial efficiency after seven cycles.

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Acknowledgement

The financial support provided by the Royal Golden Jubilee Ph.D. Program, the Thailand Research Fund (TRF), is gratefully acknowledged.

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  1. Department of Chemical Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Bangkok, 10140, Thailand

    Somjate Photong & Virote Boonamnuayvitaya

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  1. Somjate Photong
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  2. Virote Boonamnuayvitaya
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Correspondence to Virote Boonamnuayvitaya.

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Photong, S., Boonamnuayvitaya, V. Synthesis of APTMS-Functionalized SiO2/TiO2 Transparent Film Using Peroxo Titanic Acid Refluxed Solution for Formaldehyde Removal. Water Air Soil Pollut 210, 453–461 (2010). https://doi.org/10.1007/s11270-009-0268-5

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  • DOI: https://doi.org/10.1007/s11270-009-0268-5

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