Photochemistry and picosecond absorption spectra of aqueous suspensions of a polycrystalline titanium dioxide optically transparent in the visible spectrum

Transition metal ions effect on the properties and photocatalytic activity of nanocrystalline TiO2 prepared in an ionic liquid

“…In order to enhance the photocatalytic activity of TiO 2 , interfacial charge-transfer reaction should be increased and electron-hole recombination decreased by modifying the properties of TiO 2 colloids [7,8]. Several methods have been developed such as increasing its surface to volume ratio, optimization of particle size, coupling of TiO 2 particles with other semiconductor particles, and doping of metals and non-metals [9,10]. The presence of metal ion dopants in the TiO 2 crystalline significantly influences photoreactivity by changing charge carrier recombination rates, and interfacial electron-transfer rates by shifting the band gap of the catalysts into the visible region [11].…”

Nanomaterials for Water Treatment

“…Consequently, the use of quantum-sized semiconductor particles may result in increased photoactivity for systems in which the rate-limiting step is interfacial charge transfer [81]. Hence, semiconductor nanoparticles of sufficient size can possess enhanced photoredox chemistry that might not otherwise exist in bulk materials [73,79,81,[83][84][85][86][87].…”

“…However, even a slight decrease or increase of particle size results in a decrease in efficiency [77,79,86,88,89].…”

Synthesis and characterization of M-fullerene/TiO2 photocatalysts designed for degradation azo dye

“…These efforts include doping with other elements, sensitizing with dyes, and coating the surface with noble metals or other semiconductors [9,10]. The high degree of recombination between the photogenerated electrons and holes in semiconductor particles is a major limiting factor in the photodegradation process [11].…”