A comparative study of photocatalysis on highly active columnar TiO2 nanostructures in-air and in-solution

Photoinduced processes of adsorbed and associated dye molecules in mesoporous titania coatings

“…[1][2][3][4][5][6][7] In many studies dyes are used as model materials in photocatalytic measurements [8][9][10][11], as they are easily detected by optical spectroscopic methods; furthermore, dyesemiconductor systems have practical importance in the fields of dye-sensitized solar cells (DSSCs) [4,12], and waste water treatment in the textile industry where dyes are major pollutants [13][14][15]. Most studies measure the absorbance decrease of dye solutions containing photoactive materials under ultraviolet (UV) or visible light [9,[16][17][18][19][20][21], and only a fraction of the literature describes measurements on the air-solid interface, which can provide a simple model system and can be especially important for self-cleaning coatings [22][23][24][25][26][27].…”

Photocatalytic Growth of Hierarchical Au Needle Clusters on Highly Active TiO2 Thin Film

“…Therefore, we altered the UV light intensity to understand its influence on the growth of HAuNCs. In order to verify the ability of generating electron–hole pairs in TiO 2 (photocatalytic performance) at different UV light intensities, we immersed the prepared TiO 2 samples in an aqueous methylene blue (MB) solution and monitored the change in its absorption (at 664 nm, as shown in Figure d), as we described in detail previously . Photocatalytic performances (monitored by photocatalytic bleaching of MB) at different light intensities were correlated with the morphology of HAuNCs, as shown by insets given in Figure d (achieved at the corresponding light intensities).…”

“…TiO 2 thin film (deposited on 1 cm 2 Si substrate) was immersed in the 6.5 mL aqueous MB solution (10 × 10 −6 m ) and irradiated with the UV light (365 nm). The change in absorption of MB solution was monitored at 664 nm wavelength by UV–vis spectroscopy (StellarNet EPP2000C‐SR‐50 with SL5‐DH light source) …”

Ag Nanoparticles Decorated TiO2 Thin Films with Enhanced Photocatalytic Activity

“…TiO 2 NPs exhibit a high photocatalytic activity due to their high surface area and confined geometry. Nevertheless, the use of TiO 2 NPs counter with some limitations such as the difficulty of their filtration from the liquid medium to be cleaned up . Additionally, in order to deposit Ag + ions on immobilized TiO 2 NPs, mostly high‐intensity (400 W) UV irradiation is needed since within a liquid medium such NPs are continuously and randomly moving and this hinders effective exposure .…”