Enhancement of formaldehyde degradation by amine functionalized silica/titania films.
Doping amine functional groups into SiO2/TiO2 films for enhancing the decomposition of formaldehyde has been investigated using the modified sol-gel method to prepare organic-inorganic hybrid photocatalysts via the co-condensation reaction of methyltrimethoxysilane (MTMOS) and amine functional groups. n-(2-Aminoethyl)-3-aminopropyl-trimethoxysilane (AEAPTMS) and 3-aminopropyl-trimethoxysilane (APTMS) were selected to study the effect of amine functional groups on the enhancement of formaldehyde adsorption and degradation under a UV irradiation process. Physicochemical properties of prepared photocatalysts were characterized with nitrogen adsorption-desorption isotherms measurement, X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) spectroscopy. The results indicated that the APTMS/SiO2/TiO2 film demonstrated a degradation efficiency of 79% superior to those of SiO2/TiO2 and AEAPTMS/SiO2/TiO2 films due to the synergetic effect of adsorption and photocatalytic properties. The APTMS/SiO2/TiO2 film can be recycled with about 7% decreasing of degradation efficiency after seven cycles.
Department of Chemical Engineering, King Mongkut's University of Technology Thonburi, 126 Pracha-utit Road, Bangmod, Bangkok 10140, Thailand. somjate_che@yahoo.com
Somjate
S
Photong
Virote
V
Boonamnuayvitaya
D000327:Adsorption; D000393:Air Pollutants / Q000737:chemistry*; D000397:Air Pollution / Q000517:prevention & control; D000588:Amines / Q000737:chemistry*; D005557:Formaldehyde / Q000737:chemistry*; D010782:Photolysis; D012822:Silicon Dioxide / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
D000393:Air Pollutants; D000588:Amines; C009495:titanium dioxide; D005557:Formaldehyde; D012822:Silicon Dioxide; D014025:Titanium