In situ surface formation of TiO2/Ti(NO2) hybrid nanocomposites with N2 APPJ treatment for efficient C2H4 photodegradation
2019
Zhao, Wenfeng | Ji, Bang | Gu, Yao | Yang, Zhou | Lu, Mingjian
TiO₂/Ti(NO₂) hybrid films were prepared using N₂ atmospheric pressure plasma jet treatment on TiO₂ coating. The film structure and morphology have been investigated using optical emission spectra, Fourier-transform infrared spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The formed TiO₂/Ti(NO₂) photocatalystic thin films were applied for C₂H₄ photodegradation under UV irradiation. The results showed that the composite films exhibited superior photocatalytic activity over the untreated TiO₂ film. The C₂H₄ concentration after 120 min varied from 12 to 6.2 mg/L, 6.7 mg/L, 7 mg/L for TiO₂ with 1 min, 2 min and 3 min plasma treatment, respectively. In the banana storage experiment, the concentration of C₂H₄ was reduced from 15 to 9 ppm after 36 h with TiO₂/Ti(NO₂) nanocomposite film illuminated by UV light. The photocatalytic mechanism has been discussed. The composite film is able to more effectively separate the photo-excited electrons and holes, thus leading to the much high activity in C₂H₄ degradation. The current work has paved a way towards postharvest fruit preservation.
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