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http://dx.doi.org/10.5322/JES.2006.15.6.533

Photocatalytic Oxidation of NOx onCaO/TiO2  

Shin Joong-Hyeok (Department of Environmental Engineering, Dongshin University)
Lim Woong-Mook (Department of Geosystem Engineering, Chonnam National University)
Jun Jin (Department of Environmental Engineering, Dongshin University)
Publication Information
Journal of Environmental Science International / v.15, no.6, 2006 , pp. 533-538 More about this Journal
Abstract
Removal of $NO_x$ on $CaO/TiO_2$ photocatalyst manufactured by the addition of $Ca(OH)_2$ was measured in relation with the amount of $Ca(OH)_2$ and calcination temperature. In case of pure $TiO_2$, the $NO_x$ removal decreased greatly with the increase of calcination temperature from $500^{\circ}C\;to\;700^{\circ}C$, whereas in the photocatalyst added with $Ca(OH)_2$, the removed amount of $NO_x$ was high and constant regardless of calcination temperature. Considering $NO_x$ removal patterns depending on the amount of $Ca(OH)_2$ added(50, 30, 10wt%), high removal rate showed at the photocatalysts containing less than 30wt% of $Ca(OH)_2$, and it was about 30% higher than that of pure $TiO_2$. From the XRD patterns, it is seen that the addition of $Ca(OH)_2$ contributes to maintaining the anatase structure that is favourable to photocatalysis. It also indicates that the possibility of the formation of calcium titanate($CaTiO_3$) by reacting with $TiO_2$ above $700^{\circ}C$. Apart from the favourable crystalline structure, the addition of $Ca(OH)_2$ helped increase the alkalinity of photocatalyst surface, thus promoting the photooxidation reaction of $NO_x$.
Keywords
Photocatalysis; Titanium dioxide; Calcium oxide; $NO_x$ removal;
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