Enhanced photocatalytic degradation of NOx gases by regulating the microstructure of mortar cement modified with titanium dioxide

Photocatalytic NOx abatement by calcium aluminate cements modified with TiO2: Improved NO2 conversion

“…In absolute terms, w-CAC (Fig. 6b) was more effective than d-CAC ( based compounds is well known [36,37], in the case of PC samples, an increase of the NO 2 concentration is usually reported as a consequence of the fast photochemical oxidation of NO [7,9,10,38]. Although the main part of this NO 2 formed is expected to be later oxidized to nitrate ions, the amount of NO 2 evolved and not oxidized could be significant.…”

“…Besides, certain amounts of NO 2 -produced in the photocatalytic process (reaction 6) -have been reported to be evolved and unretained by the PC systems. These amounts of released NO 2 partially counteract the photocatalytic efficiency [7,9,10]. [11].…”

Synthesis and characterization of carbon modified TiO2 nanotube and photocatalytic activity on methylene blue under sunlight

“…As a kind of semiconductor, titania (TiO 2 ) was recognized as the best photocatalyst to decompose the organic compounds for the treatment of waste water and air pollution due to its outstanding performance, such as broad functionality, longterm stability, low energy consumption and non-toxicity [4][5][6]. The nanoscale TiO 2 , especially the TiO 2 nanotube (TNT) has better photocatalytic activity than TiO 2 powders because of its large specific surface area [7,8]. But the forbidden bandwidth of anatase TiO 2 is relatively large, and reduced its photocatalytic efficiency [9][10][11].…”

Investigation on Parameters Affecting the Effectiveness of Photocatalytic Functional Coatings to Degrade NO: TiO2 Amount on Surface, Illumination, and Substrate Roughness

“…In recent years, many studies in the literature have been devoted to understand and improve the degradation of NO x by photocatalysis using TiO 2 -containing materials (TiO 2 is used as an additive and mixed with cement and concrete) or TiO 2 -based dispersions (TiO 2 is used as a coating such as glaze and paint). Focus has especially been made on the NO x photocatalytic oxidation mechanism [15,18], the factors affecting the photocatalysis process [19][20][21][22], the experimental setup at a laboratory scale [23][24][25][26][27][28], and the development of photocatalysts active under visible light and the photocatalysis efficiency at real scale [29][30][31][32][33][34][35].…”