Photocatalytic Properties of Amorphous N-Doped TiO2 Photocatalyst under Visible Light Irradiation

• Published in: Catalysts Vol. 11; no. 8; p. 1010
• Main Authors: Chung, Kyong-Hwan, Kim, Byung-Joo, Park, Young-Kwon, Kim, Sang-Chai, Jung, Sang-Chul
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.08.2021
• Subjects: amorphous TiO2; Anatase; Atoms & subatomic particles; Catalysts; Catalytic activity; Chemical reactions; Decomposition; Energy; Energy gap; Heat; Heat treatment; Hydrogen production; Light; Light irradiation; Liquid phases; Low temperature; Metal oxides; Methylene blue; Nitrogen; nitrogen doping; Optical properties; Particle size; Photocatalysis; Photocatalysts; photocatalytic activity; Sol-gel processes; Spectrum analysis; Titanium dioxide; visible light
• ISSN: 2073-4344; 2073-4344
• DOI: 10.3390/catal11081010

Amorphous TiO2 doped with N was characterized by its photocatalytic activity under visible light irradiation. The amorphous N-doped TiO2 was prepared by the sol-gel method through heat treatment at a low temperature. The photocatalyst showing activity in visible light despite heat treatment at low temperature can be applied to plastics and has excellent utility. The N-doped TiO2 appeared amorphous when heat-treated at 130 °C. It was converted into an anatase-type N-doped TiO2 when this was calcined at 500 °C. The photocatalyst showed photocatalytic activities in the photocatalytic decomposition of formaldehyde and methylene blue under visible light irradiation. The photocatalyst exhibited a higher rate of hydrogen production than that of TiO2 in photocatalytic decomposition of water under liquid-phase plasma irradiation. The bandgap of the amorphous N-doped TiO2 measured by investigation of optical properties was 2.4 eV. The lower bandgap induced the photocatalytic activities under visible light irradiation.