Strategy for Modifying Layered Perovskites toward Efficient Solar Light-Driven Photocatalysts for Removal of Chlorinated Pollutants

We have explored an efficient strategy to enhance the overall photocatalytic performances of layered perovskites by increasing the density of hydroxyl group by protonation. The experimental procedure consisted of the slow replacement of interlayer Rb+ cation of RbLaTa2O7 Dion-Jacobson (DJ) perovskit...

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Bibliographic Details
Published in:Catalysts 2020-06, Vol.10 (6), p.637
Main Authors: Raciulete, Monica, Papa, Florica, Negrila, Catalin, Bratan, Veronica, Munteanu, Cornel, Pandele-Cusu, Jeanina, Culita, Daniela C., Atkinson, Irina, Balint, Ioan
Format: Article
Language:English
Subjects:
Catalysts
Chemical reactions
Density
Hydroxyl groups
Interlayers
Ion exchange
Light
Morphology
perovskite-type structure
Perovskites
Photocatalysis
Photocatalysts
Photodegradation
Pollutants
Protonation
simulated solar light
Specific surface
Surface area
TCE photodegradation
Trichloroethylene
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Summary:We have explored an efficient strategy to enhance the overall photocatalytic performances of layered perovskites by increasing the density of hydroxyl group by protonation. The experimental procedure consisted of the slow replacement of interlayer Rb+ cation of RbLaTa2O7 Dion-Jacobson (DJ) perovskite by H+ via acid treatment. Two layered perovskites synthesized by mild (1200 °C for 18 h) and harsh (950 and 1200 °C, for 36 h) annealing treatment routes were used as starting materials. The successful intercalation of proton into D-J interlayer galleries was confirmed by FTIR spectroscopy, thermal analyses, ion chromatography and XPS results. In addition, the ion-exchange route was effective to enlarge the specific surface area, thus enhancing the supply of photocharges able to participate in redox processes involved in the degradation of organic pollutants. HLaTa_01 protonated layered perovskite is reported as a efficient photocatalyst for photomineralization of trichloroethylene (TCE) to Cl− and CO2 under simulated solar light. The enhanced activity is attributed to combined beneficial roles played by the increased specific surface area and high density of hydroxyl groups, leading to an efficiency of TCE mineralization of 68% moles after 5 h of irradiation.
ISSN:2073-4344
2073-4344
DOI:10.3390/catal10060637