Photoluminescence and photocatalytic activity of highly dispersed titanium oxide anchored onto porous Vycor glass

Optical absorption of polydisperse TiO2: Effect of surface doping by transition metal cations

“…First, it is an electron transfer from oxygen (O 2-) to titanium (Ti 4+ ) ions, resulting in formation of excitons. Similar peaks have been observed in the photoluminescence spectra of anatase TiO 2 powder anchored onto porous Vycor glass [9] and in the rutile single crystals at low temperatures [10]. The authors of [9] have attributed these bands to vibrational structure, suggesting that the photon energy absorbed by TiO 2 is mainly localised at Ti-O bonds.…”

Characterization of Surface and Photooxidative Properties of Supported Metal Oxide Photocatalysts Using Solid-State NMR

“…Work by Anpo and coworkers has shown that anatase TiO2 can be formed on the surface of porous Vycor glass (PVG) by anchoring three or more monolayers of TiO2 on the glass surface using chemical vapor deposition or metal ion implantation. [10][11][12] In situ SSNMR has been used to study the surface morphology and photocatalytic activity of one, two, and four monolayers of TiO2 supported on PVG using the adsorption and gas-phase photooxidation of ethanol, acetone, and 2-propanol.…”

Photocatalytic Activity of TiO2-containing Al-Mesoporous Silica Thin Films

“…This fact shows that the TiO 2 thin films on the surface of Al-MSF are assumed to be highly and homogeneously dispersed and minimized up to nanoorder thickness. This hypsochromic shift of the end absorption of the band gap of the semiconductors are well-known as "quantum size effect", which has sometimes observed in cases of the TiO 2 supported on zeolites (15)(16)(17)(18). Moreover, TiO 2 modification of Al-MSF was confirmed by the stretching vibrations of Ti-O observed at 1087 cm -1 and Ti = O at 975 cm -1 , as shown in Fig.…”