Synthesis of N and S Co-doped TiO2 Nanotubes for Advanced Photocatalytic Degradation of Volatile Organic Compounds (VOCs) in Gas Phase

TiO2-based catalytic systems for the treatment of airborne aromatic hydrocarbons

“…83,84 Besides, doping TiO 2 lattice with the N element induces new mid-gap energy states/impurity levels (N 2p band over the O 2p valence band of TiO 2 ), which considerably expand the visible-light excitability by narrowing the bandgap of N-TiO 2 to 2.5 eV compared with 3.15 eV for bare TiO 2 . 85,86 Therefore, upon illumination with visible light, the N impurity levels ( e.g. , substitutional (N s ) and interstitial nitrogen state (N i )) were excited, followed by the migration of the photoinduced e − to the CB of TiO 2 .…”

Synthesis of S doped TiO2 (S-TiO2) to enhance photocatalytic degradation of Ciprofloxacin in aqueous solutions under visible light

“…The decrease in Ebg of the S-TiO2 could be explained due to the existence of S dopants in the TiO2 structure. These dopants would modify the potential band of the TiO2 leading to a decrease in Ebg [26]. So it may be promoted S-TiO2 is more active than TiO2 under visible light irradiation…”

Phosphonium ionic liquid-promoted Ce-doped nitrogen-rich TiO2 for degradation gaseous pollutant under visible light irradiation

“…Furthermore, compared with the degradation of liquid phase pollutants, the inevitable problem of gas phase pollutants degradation is that the degradation products accumulate on the catalyst surface, resulting in deactivation [15,16]. As the above problems are unavoidable, it is necessary to improve the previous photocatalytic efficiency, which requires that the photocatalysts used must have a large specific surface area in order to promote the rapid production of active substances [17,18]. Therefore, it is challenge to improve photocatalytic activity and deactivation of TiO 2 for gaseous pollutants under visible light, which is less time-consuming and energy-consuming.…”