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- Title
Dual Use of Copper-Modified TiO 2 Nanotube Arrays as Material for Photocatalytic NH 3 Degradation and Relative Humidity Sensing.
- Authors
Čižmar, Tihana; Grčić, Ivana; Bohač, Mario; Razum, Marta; Pavić, Luka; Gajović, Andreja
- Abstract
In this paper, we emphasized the dual application of Cu-modified vertically aligned TiO2 nanotube arrays as photocatalyst and a relative humidity sensor. The TiO2 nanotube arrays were obtained by anodization of the titanium layer prepared using radio frequency magnetron sputtering (RFMS) and modified with different copper concentrations (0.5, 1, 1.5, and 2 M) by a wet-impregnation method. The sample modified with 2 M Cu(NO3)2 solution showed the highest efficiency for the NH3 photocatalytic degradation and the most pronounced humidity response in comparison to the other studied samples. In order to investigate the structure and impact of Cu modification, X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS) were used. The photocatalytic activity and the kinetic study of ammonia oxidation were studied in a mini-photocatalytic wind tunnel reactor (MWPT), while relative humidity sensing was examined by impedance spectroscopy (IS). Higher NH3 oxidation was a direct consequence of the increased generation of •OH radicals obtained by a more efficient photogenerated charge separation, which is correlated with the increase in the DC conductivity.
- Subjects
HUMIDITY; PHOTOCATALYSIS kinetics; TITANIUM dioxide; NANOTUBES; CARBON nanotubes; MAGNETRON sputtering; WIND tunnels; PHOTOCATALYTIC oxidation
- Publication
Coatings (2079-6412), 2021, Vol 11, Issue 12, p1500
- ISSN
2079-6412
- Publication type
Article
- DOI
10.3390/coatings11121500