N-TiO2-δ/g-C3N4 Dual Photocatalysts for Efficient Oxytetracycline Hydrochloride Photodegradation and CO2 Photoreduction

A series of x% (wt) N-TiO2-δ/g-C3N4 composites was synthesized by calcination and hydrothermal methods (labeled xTiCN, x: 5, 10, and 15). All composites were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, UV-vis diffuse reflectance spectroscopy, transmission electron mi...

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Bibliographic Details
Published in:Adsorption science & technology 2022-05, Vol.2022
Main Authors: Nguyen, Thanh-Binh, Dinh Thi, Thuy Hang, Dinh Thi, Kim Hue, Bui Minh, Hien, Nguyen Thi, Ngoc Quynh, Vu Ngoc, Duy, Nguyen Dinh, Bang
Format: Article
Language:English
Subjects:
Carbon dioxide
Carbon nitride
Catalytic activity
Composite materials
Diffuse reflectance spectroscopy
Electromagnetic absorption
Fourier transforms
Holes (electron deficiencies)
Infrared spectroscopy
Light irradiation
Oxytetracycline
Photocatalysis
Photocatalysts
Photodegradation
Photoelectrons
Spectrum analysis
Synthesis
Titanium carbonitride
Titanium dioxide
X ray photoelectron spectroscopy
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Summary:A series of x% (wt) N-TiO2-δ/g-C3N4 composites was synthesized by calcination and hydrothermal methods (labeled xTiCN, x: 5, 10, and 15). All composites were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, UV-vis diffuse reflectance spectroscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The photocatalytic activity of these composites was evaluated through oxytetracycline hydrochloride (denoted as OTC) photodegradation and CO2 photoreduction. The xTiCN composites exhibited higher OTC photodegradation than bulk g-C3N4. 10TiCN was slightly more active than 5TiCN and 15TiCN, with a photodegradation yield of 97% after 5 h of light irradiation and constant rate of 0.647 h-1. For CO2 photoreduction, it was observed that 5TiCN exhibited the highest activity among the synthesized composites, with 7.0 ppm CH4 formed. This CH4 concentration was 7.8 times higher than the concentration formed by bulk g-C3N4 (0.9 ppm). A Z-scheme mechanism was proposed to explain the enhanced photocatalysis by x% (wt) N-TiO2-δ/g-C3N4 composites. The Z-scheme structure increased redox ability, caused better separation of photogenerated electron-hole pairs, and broadened the light absorption zone of the photocatalysts.
ISSN:0263-6174
2048-4038
DOI:10.1155/2022/3057189