A review on catalytic applications of Au/TiO2 nanoparticles in the removal of water pollutant

Tungsten-based nanomaterials (WO 3 & Bi 2 WO 6 ): Modifications related to charge carrier transfer mechanisms and photocatalytic applications

“…The metal deposition on the semiconductor surface is interested not only because of effective charge separation but also ascribed to the extension of visible light absorption arising from the surface plasmon resonance effect of metal NPs [105,106]. The absorption edge of WO 3 (<450 nm) and optical response region of surface Plasmon resonance scarcely overlaps (>450 nm), indicating that solar light can be efficiently exploited without any conflict between their optical responses.…”

“…In such a scenario, surface charge carrier recombination outweighs the interfacial charge transfer Page 21 of 72 A c c e p t e d M a n u s c r i p t 21 process [7,8,118,119]. Conversely, electron trapping by the metal islands may not be apparent at its very low content, while the overlapping aggregates masks the WO 3 via surface plasmon absorption at higher loading and hinders the adsorption of dye molecules besides encouraging the recombination process [8,105,106]. In fact, small sizes of metal island gathers larger electron density and lessen the shadowing effect on the catalyst surface owing to their uniform distribution and that the higher number of metal deposits effectively capture the CB electrons [8].…”

Response surface methodology approach for optimization of methyl orange adsorptive removal by magnetic chitosan nanocomposite

“…Thus, their elimination has become a major concern in recent years [29,30]. In this study, we applied the experimental design as a highly efficient optimization method to optimize the adsorption process for the removal of methyl orange (MO), as a model anionic dye, using a recently introduced magnetic chitosan based core-shell material (chitosan/Al 2 O 3 /Fe 3 O 4 , Cs-AF) [20].…”

Surface Plasmon-Assisted Solar Energy Conversion

“…By varying the size of the nanorods along the major axis, the position of the plasmon absorption peak belonging to oscillations along the major axis shifts its spectral position, whereas the other peak (belonging to oscillations perpendicular to the major axis) is shifted only slightly [91]. In many studies, plasmonic catalysts supported on semiconductors were reported to be highly active and selective for a wide range of reactions including selective oxidation of alcohols [71,92], water splitting [8,18,29,31,93], and pollutant degradation [55,58,67,94] under visible light irradiation. The mechanistic principles responsible for the high selectivities and activities under visible light illumination are the subject of controversial discussions in the literature and remain inconsistent within the field.…”