Enhancement of formaldehyde degradation by amine functionalizedsilica/titania films

Doping amine functional groups into SiO2/TiO2 films for enhancing the decomposition of formaldehyde has been investigatedusing the modified sol-gel method to prepare organic-inorganic hybrid photocatalysts via the co-condensation reaction ofmethyltrimethoxysilane (MTMOS) and amine functional groups. n-(2-Aminoethyl)-3-aminopropyl-trimethoxysilane (AEAPTMS)and 3-aminopropyl-trimethoxysilane (APTMS) were selected to study the e ect of amine functional groups on the enhancement offormaldehyde adsorption and degradation under a UV irradiation process. Physicochemical properties of prepared photocatalysts werecharacterized with nitrogen adsorption-desorption isotherms measurement, X-ray di raction (XRD) and Fourier transform infrared(FT-IR) spectroscopy. The results indicated that the APTMS/SiO2/TiO2 film demonstrated a degradation e ciency of 79% superiorto those of SiO2/TiO2 and AEAPTMS/SiO2/TiO2 films due to the synergetic e ect of adsorption and photocatalytic properties. TheAPTMS/SiO2/TiO2 film can be recycled with about 7% decreasing of degradation e ciency after seven cycles.