Degradation of Toluene Using Modified TiO₂ as Photocatalysts

Abstract

Volatile organic compounds (VOCs), especially toluene as the typical indoor air pollutants, are toxic and environmentally persistent whose removal is undoubtedly becoming increasingly urgent matter over these years. Titania is one of the most promising photocatalysts for the degradation of organic compounds, whereas the large band gap of titania and massive recombination of photogenerated charge carriers limit its overall photocatalytic effciency. These defects can be tackled by modifying the electronic band structure of titania including various strategies like metal deposition, non-metal atoms substitution, transition metal ions doping, and coupling with a narrow band gap semiconductor, etc. This review encompasses several advancements made in these aspects, and also the influence factors such as physical morphologies changing, humidity, as well as the presence of O2 etc, are involved. To be practically considering, TiO2 photocatalysts require being fixed on the bulky supports like silica, alumina, clays and activated carbons. Moreover, photocatalytic coatings deposited on external building materials, like roofing tiles and corrugated sheets, is becoming the attractive application potentials to remove toluene from air.

Functionalized Activated Carbon Derived from Biomass for Photocatalysis Applications Perspective

“…TiO 2 powders contributed to some drawbacks in separating phase in photocatalysis, with the purpose of its emission in the atmosphere because of their small particle size and recovery, the loss of photocatalyst if the separation is not promising, the need of fluidization of the powder in gaseous phase with cost and energy, and the scaling difficulties involved [237,240]. Also, since radiation from the light compromises 47% of visible light, 48% infrared radiation, and 5% UV light, so TiO 2 acts as a benchmark of UV photocatalysis that it goes deactivated under visible light because of its wide band gap [241].…”

Highly Stable Photocatalytic Removal of Paraquat Dichloride using ZnO/TiO2 supported on PVC

“…To increase the reusability of TiO2-catalysts, supported materials such as alumina, silica, zeolites, and activated carbon had been introduced [5,6]. Notably, the selection of supported materials is not straightforward.…”