Band-Gap Engineering of Layered Perovskites by Cu Spacer Insertion as Photocatalysts for Depollution Reaction

A multi-step ion-exchange methodology was developed for the fabrication of Cu(LaTa2O7)2 lamellar architectures capable of wastewater depollution. The (001) diffraction line of RbLaTa2O7 depended on the guest species hosted by the starting material. SEM and TEM images confirmed the well-preserved lam...

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Bibliographic Details
Published in:Catalysts 2022-11, Vol.12 (12), p.1529
Main Authors: Raciulete, Monica, Anastasescu, Crina, Papa, Florica, Atkinson, Irina, Bradu, Corina, Negrila, Catalin, Eftemie, Diana-Ioana, Culita, Daniela C., Miyazaki, Akane, Bratan, Veronica, Pandele-Cusu, Jeanina, Munteanu, Cornel, Dobrescu, Gianina, Sandulescu, Alexandra, Balint, Ioan
Format: Article
Language:English
Subjects:
Catalysis
Catalysts
Catalytic activity
Chemical reactions
Copper
copper spacer
Crystal structure
Current carriers
Doppler effect
Efficiency
Electromagnetic absorption
Energy gap
Insertion
Interlayers
Ion exchange
Lamellar structure
layered perovskite
Light
Perovskites
phenol
Photocatalysis
Photodegradation
Photoelectric effect
Red shift
Semiconductors
simulated solar irradiation
Solar energy
Solar radiation
Wastewater
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Summary:A multi-step ion-exchange methodology was developed for the fabrication of Cu(LaTa2O7)2 lamellar architectures capable of wastewater depollution. The (001) diffraction line of RbLaTa2O7 depended on the guest species hosted by the starting material. SEM and TEM images confirmed the well-preserved lamellar structure for all intercalated layered perovskites. The UV–Vis, XPS, and photocurrent spectroscopies proved that Cu intercalation induces a red-shift band gap compared to the perovskite host. Moreover, the UV–Vis spectroscopy elucidated the copper ions environment in the Cu-modified layered perovskites. H2-TPR results confirmed that Cu species located on the surface are reduced at a lower temperature while those from the interlayer occur at higher temperature ranges. The photocatalytic degradation of phenol under simulated solar irradiation was used as a model reaction to assess the performances of the studied catalysts. Increased photocatalytic activity was observed for Cu-modified layered perovskites compared to RbLaTa2O7 pristine. This behavior resulted from the efficient separation of photogenerated charge carriers and light absorption induced by copper spacer insertion.
ISSN:2073-4344
2073-4344
DOI:10.3390/catal12121529