Photocatalytic degradation of gaseous benzene using metal oxide nanocomposites

Kinetic Aspects of Benzene Degradation over TiO2-N and Composite Fe/Bi2WO6/TiO2-N Photocatalysts under Irradiation with Visible Light

“…Accumulation of these deposits can substantially reduce the ability of photocatalyst to oxidize benzene molecules due to blocking its adsorption sites. Other transformation routes [ 51 ] include the reactions of photoinduced OH • with adsorbed benzene molecules to form various types of alkyl radicals (e.g., CH 3 • , C 2 H 5 • and C 6 H 5 • ), which also contribute to the overall decomposition of benzene [ 52 ].…”

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

“…1). [63][64][65] The LSPR is collective oscillations of the CB electrons within noble-metal NPs (e.g., Au and Ag) driven by the electromagnetic field of the incident light. The high-energy electrons formed during this process are called ''hot electrons''.…”

“…The direct contact of noble metals with TiO 2 leads to the equilibration of the Fermi energy level. 63,65 As a result, the Schottky junction formed at the metal-TiO 2 interface (through the downward bending of CB of TiO 2 ) endows hot electrons with appropriate energy (E Z DE barrier) to pass through the interface. This process can help boost the catalytic reaction over the TiO 2 surface in the visible region with the efficient separation of the photo-excited charge carriers (e À -h + pairs) (Fig.…”

“…151 Other key performance metrics, such as the quantum yield (QY: molecules photon À1 ; eqn ( 19)), the space-time yield (STY: molecules photon À1 mg À1 ; eqn (20)), and the figure of merit (FOM: L mg À1 mol À1 J À1 ; eqn (21)), were also used and computed to offer a more impartial assessment of the actual performance of the reported photothermocatalysts tested under varying experimental conditions. 27,65 Under the assumption that all irradiated photons are absorbed by the photocatalyst, the QY value can be used to express the ratio between the number of oxidized VOC molecules to the number of photons absorbed or emitted (i.e., light irradiance) during the photocatalytic oxidation process. 152,153 Considering the significant effect of photocatalyst amount on the catalytic reaction, the STY (a comparable metric to the turnover frequency (TOF) values) was also calculated by normalizing the QY value with the amount of catalyst used in the reaction system to assess the number of oxidized VOC molecules over each catalytic This journal is © The Royal Society of Chemistry 2023 site irradiated by the targeted light source.…”

Synergistic Effect of Reactive Oxygen Species in Photothermocatalytic Removal of VOCs from Cooking Oil Fumes over Pt/CeO2/TiO2

“…Regarding the reaction mechanism of synergistic photothermocatalytic oxidation, researchers have proposed different explanations for the effect of different catalysts on VOC elimination. From the point of photocatalysis, we can know that the supported nanoparticles on a semiconductor can change the band structure of a composite, thereby regulating the light absorption and charge transfer capacity. , The heat in the photothermocatalytic reaction promotes formation and transfer of the reactive oxygen species, which is critical for improving the catalytic performance and promoting deep oxidation of the intermediates accumulated on the surface . Many studies have shown that the enhancement in catalytic performance after illumination is not a simple effect of light-driven heating but a more complex photothermocatalytic synergism.…”