Abstract
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.
Highlights
Atmospheric pollution resulting from photochemical oxidants, such as nitrogen oxides (NOx ; NO+NO2 ) and ozone, has been considered one of the critical concerns in urban areas. [1]
TiO2 materials (TCX; TC means N-doped TiO2, X is wt% of thiocyanuric acid (TCA) on TiO2 )
Materials (TCX; TC means N-doped TiO2, X is wt% of TCA on TiO2)
Summary
Atmospheric pollution resulting from photochemical oxidants, such as nitrogen oxides (NOx ; NO+NO2 ) and ozone, has been considered one of the critical concerns in urban areas. [1]. Atmospheric pollution resulting from photochemical oxidants, such as nitrogen oxides (NOx ; NO+NO2 ) and ozone, has been considered one of the critical concerns in urban areas. NOx , a by-product resulting from fossil fuel incineration and photochemical conversion in nature, is mainly considered a dominant contributor to environmental problems such as photochemical smog, acid rain, haze, etc. The atmospheric NOx concentration (annual mean concentrations of 0.01–0.05 ppm in urban areas over the world [4]) has drastically increased over the past few decades due to industrial genesis and automobile development [2]. NOx has stimulating effects on the environment, human and animal health, and plant vegetation [5]. Researchers have manifested various schemes such as direct decomposition [6], selective catalytic/noncatalytic reduction [7], solid–liquid adsorption [8], plasma-assisted catalytic reduction [9], and photocatalytic oxidation (PCO) for effective removal of NOx from the atmosphere
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