期刊
CATALYSTS
卷 11, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/catal11010109
关键词
N-doped TiO2; precipitation; NOx removal
资金
- R&D Convergence Program of NST (National Research Council of Science & Technology) of the Republic of Korea [CAP-15-02-KBSI]
- National Research Foundation of Korea (NRF) - Korean government (MSIT) [2019R1C1C1007745]
- National Research Foundation of Korea (NRF) - Korean government (Ministry of Science, ICT & Future Planning) [2019R1A4A2001527]
- National Research Foundation of Korea [2019R1C1C1007745] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Titanium oxide (TiO2) is a potential photocatalyst for removing toxic NOx from the atmosphere, but its low absorption of visible light and high charge recombination limit its practical application. Nitrogen-doped TiO2 (TC) shows enhanced visible-light absorption and improved separation/transfer of photo-excited charge carriers, leading to excellent photocatalytic activities in NO oxidation under UV and visible light irradiation.
Titanium oxide (TiO2) is a potential photocatalyst for removing toxic NOx from the atmosphere. Its practical application is, however, significantly limited by its low absorption into visible light and a high degree of charge recombination. The overall photocatalytic activity of TiO2 remains too low since it can utilize only about 4-5% of solar energy. Nitrogen doping into the TiO2 lattice takes advantage of utilizing a wide range of solar radiation by increasing the absorption capability towards the visible light region. In this work, N-doped TiO2, referred to as TC, was synthesized by a simple co-precipitation of tri-thiocyanuric acid (TCA) with P25 followed by heat treatment at 550 degrees C. The resulting nitrogen doping increased the visible-light absorption and enhanced the separation/transfer of photo-excited charge carriers by capturing holes by reduced titanium ions. As a result, TC samples exhibited excellent photocatalytic activities of 59% and 51% in NO oxidation under UV and visible light irradiation, in which the optimum mass ratio of TCA to P25 was found to be 10.
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