Photocatalytic Evaluation of TiOx Films Produced by Cathodic Arc-PVD with Silver Addition by UVC Photo-Reduction Method

A titanium (Ti) commercial cathode material and high purity Ar and O2 were used in the cathodic arc physical vapor deposition (arc-PVD) process. The TiOx coating was deposited on the three sets of Raschig rings using decreasing ratios of Ar/O2:440/60, 400/100 and 300/100. The cross sections of the T...

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Bibliographic Details
Published in:Inorganics 2022-10, Vol.10 (10), p.148
Main Authors: Raya-Tapia, Alma Yunuen, Ung-Medina, Francisco, Mondragón-Rodríguez, Guillermo César, Rivera-Muñoz, Eric Mauricio, Apolinar-Cortés, José, Méndez, Franklin J., Huirache-Acuña, Rafael
Format: Article
Language:English
Subjects:
Arc deposition
Catalysis
Cathodic coating (process)
Chemical elements
Coatings
Coliforms
Column packings
degradation
Drinking water
Dyes
Electrode materials
Emission analysis
Energy
Energy gap
Energy measurement
Evaluation
Fecal coliforms
Field emission microscopy
Heat treatment
Oxide coatings
photo-catalysis
Physical vapor deposition
Pollutants
Ratios
Reduction
Reflectance
Rhodamine
rhodamine B
Scanning electron microscopy
Silver
Spectroscopy
Textile industry
Thin films
Titanium
Titanium dioxide
Titanium oxides
X-ray diffraction
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Summary:A titanium (Ti) commercial cathode material and high purity Ar and O2 were used in the cathodic arc physical vapor deposition (arc-PVD) process. The TiOx coating was deposited on the three sets of Raschig rings using decreasing ratios of Ar/O2:440/60, 400/100 and 300/100. The cross sections of the TiOx PVD coating were analyzed using field emission scanning electron microscopy (FE-SEM), X-ray energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD). A homogeneous layer of Ti with small O content was observed, and the data suggest that a thin TiOx oxide film was deposited. For this reason, a thermal treatment was applied to the coating to oxidize it and form the rutile phase of TiO2 in the coating, which was demonstrated by grazing incidence XRD. In addition, the TiOx coatings absorb radiation, which was observed by diffuse reflectance band gap energy measurement. Silver (Ag) was added by the photo-reduction method, using UVC light to activate the TiO2 coating, and the band gap energy was analyzed by diffuse reflectance. The photocatalytic activities of the films were evaluated by degradation of the model dye rhodamine B and in the removal of fecal coliforms using two matrices, water from a secondary treatment effluent, and synthetic water.
ISSN:2304-6740
2304-6740
DOI:10.3390/inorganics10100148