Synthesis of TiO2/WO3 on Nickel Foam for the Photocatalytic Degradation of Ethylene

doi:10.15541/jim20190234

Abstract

Abstract:

Ethylene is the main factor of postharvest spoilage of fruits and vegetables. Therefore, how to reduce or remove the ethylene released during the storage of fruits and vegetables is a problem to be solved. In this study, a series of nickel foam supported TiO₂/WO₃ were prepared by Sol-Gel method. The samples were characterized by different methods. The photocatalytic degradation activity of ethylene under ultraviolet light irradiation was investigated. The results show that TiO₂/WO₃ film is successfully supported on the nickel foam, and there formed heterojunction between TiO₂ and WO₃, which efficiently enhanced the separation and transfer rates of photogenerated electron and hole. The narrowed band-gap also leads to a red shift of optical absorbance and high photoactivity. The photocatalytic activity and stability of TiO₂/WO₃ were excellent under UV light irradiation. When the mass percentage of WO₃ is 6% of TiO₂, the photocatalytic ethylene degradation of the TiO₂/WO₃ composite film reaches maximum, and the degradation rate constant is almost 9.8 times as that of TiO₂. The mechanism of photocatalytic degradation of ethylene by TiO₂/WO₃ supported on nickel foam under ultraviolet light irradiation was also discussed.

Key words: photocatalytic degradation, nickel foam, ethylene, WO₃, TiO₂

CLC Number:

TQ031.7

JI Bang, ZHAO Wenfeng, DUAN Jieli, MA Lizhe, FU Lanhui, YANG Zhou. Synthesis of TiO₂/WO₃ on Nickel Foam for the Photocatalytic Degradation of Ethylene[J]. Journal of Inorganic Materials, 2020, 35(5): 581-588.

Figures/Tables 13

Fig. 1 Schematic drawing of Photocatalytic performance evaluation device

Fig. 2 XRD patterns of samples

Fig. 3 Different magnification SEM images of nickel foam(a-c), SEM (d) and HRTEM (e) images and EDS mapping (f-h) of sample TW-6 (a, b) Nickel foam before corrosion oxidation; (c) Nickel foam after corrosion oxidation

Fig. 4 UV-Vis spectra of all samples

Fig. 5 Tauc curves of all samples

Fig. 6 XPS spectra of sample TW-6 (a) Full spectrum; High resolution spectra of (b) Ti2p; (c) O1s; (d) W4f

Fig. 7 Photoluminescence spectra of all samples

Fig. 8 Kinetics curves of ethylene degradation over all samples under UV light irradiation

Table 1 First-order kinetic parameters of photocatalytic degradation of ethylene

Photocatalytic film	Regression equation	R²	Rate constant, K°/min^-1
Nickel foam	ln(C₀/C) = 0.0002t	0.9832	0.0002
TiO₂	ln(C₀/C) = 0.0035t	0.9785	0.0035
TW-2	ln(C₀/C) = 0.0055t	0.9942	0.0055
TW-4	ln(C₀/C) = 0.0069t	0.9905	0.0069
TW-6	ln(C₀/C) = 0.0332t	0.9803	0.0332
TW-8	ln(C₀/C) = 0.0075t	0.9744	0.0075

Fig. 9 Photocatalytic degradation rate of ethylene in all samples

Fig. 10 Photocatalytic degradation of ethylene stability over TW-6 under UV light irradiation

Fig. 11 XRD patterns of sample TW-6 before and after cycling experiment

Fig. 12 Photocatalytic schematic of TiO2/WO3

References 36

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Synthesis of TiO₂/WO₃ on Nickel Foam for the Photocatalytic Degradation of Ethylene

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