Synthesis and investigation of crystal structure and optical properties of brookite TiO2 nanoparticles capped with (2-chloroquinoline-3-yl) methanol

Asadollahi, Elham; Youzbashi, A. A.; Keyanpour-Rad, Mansoor

doi:10.1016/j.molstruc.2016.09.032

Cited by 5 publications

(3 citation statements)

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“…Figure 5 reports the photoluminescence (PL) spectra of the investigated samples. The band at 388 nm, assigned to the band-to-band emission of brookite TiO2 [39][40][41], was progressively quenched increasing the amount of cerium oxide on TiO2, pointing to a lower recombination rate between the photoholes and photoelectrons in the TiO2-CeO2 composites. Indeed, the decrease of the PL band intensity is usually related to an enhancement of the charge carrier separation in the photoactive materials [42,43].…”

Section: Brookite Tio 2 -Ceo 2 Composites Characterizationmentioning

confidence: 99%

“…Indeed, the decrease of the PL band intensity is usually related to an enhancement of the charge carrier separation in the photoactive materials [42,43]. In the TiO2-CeO2 composites, also the intensity of the PL brookite band at about 430 nm, due to the self-trapped excitons confined in the TiO6 octahedra [44], decreased, whereas the PL [39][40][41], was progressively quenched increasing the amount of cerium oxide on TiO 2 , pointing to a lower recombination rate between the photoholes and photoelectrons in the TiO 2 -CeO 2 composites. Indeed.…”

Section: Brookite Tio 2 -Ceo 2 Composites Characterizationmentioning

confidence: 99%

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confidence: 99%

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Exploring the Photothermo-Catalytic Performance of Brookite TiO2-CeO2 Composites

et al. 2020

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The thermocatalytic, photocatalytic and photothermo-catalytic oxidation of some volatile organic compounds (VOCs), 2-propanol, ethanol and toluene, was investigated over brookite TiO2-CeO2 composites. The multi-catalytic approach based on the synergistic effect between solar photocatalysis and thermocatalysis led to the considerable decrease in the conversion temperatures of the organic compounds. In particular, in the photothermo-catalytic runs, for the most active samples (TiO2-3 wt% CeO2 and TiO2-5 wt% CeO2), the temperature at which 90% of VOC conversion occurred was about 60 °C, 40 °C and 20 °C lower than in the thermocatalytic tests for 2-propanol, ethanol and toluene, respectively. Furthermore, the addition of cerium oxide to brookite TiO2 favored the total oxidation to CO2 already in the photocatalytic tests at room temperature. The presence of small amounts of cerium oxide allowed to obtain efficient brookite-based composites facilitating the space charge separation and increasing the lifetime of the photogenerated holes and electrons as confirmed by the characterization measurements. The possibility to concurrently utilize the photocatalytic properties of brookite and the redox properties of CeO2, both activated in the photothermal tests, is an attractive approach easily applicable to purify air from VOCs.

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