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Effect of protonation on the photocatalytic activity of the K2La2Ti3O10 layered oxide in the reaction of hydrogen production

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Abstract

The K2La2Ti3O10 layered oxide was synthesized by high-temperature technique. Ion exchange properties of K2La2Ti3O10·H2O were investigated by continuous potentiometric titration of its suspension in KOH with HCl. The shape of the titration curve indicates that the ion-exchange reaction of interlayer K+ to H+ proceeds at pH 7.5–8.5 at the rate as high as 5% min−1. Samples obtained during the titration experiment at pH 9.8, 4.8, and 1.4 were examined by XRD, TG, ICP-AES, and SEM–EDX. Protonation already occurs at pH > 9.8, while at pH 4.8 a substitution degree of 76% is observed. K2La2Ti3O10 was found to be unstable against K+ leaching, which results in irreversible ion-exchange even when the sample is washed with distilled water. The protonation of the layered oxide significantly suppresses its photocatalytic activity in the reaction of hydrogen production from aqueous isopropanol solution, which correlates with the decreasing amount of intercalated water.

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Acknowledgements

This research was supported by the Russian Foundation for Basic Research (Grant nos. 16-33-60044 and 15-03-05981). Authors are grateful to Saint Petersburg State University Research Park. TG studies were carried out in the Center of Thermal Analysis and Calorimetry, XRD studies were carried out in Research Centre for X ray Diffraction Studies, ICP-AES studies were carried out in Centre for chemical analysis and materials research, SEM images were obtained in the Interdisciplinary Resource Centre for Nanotechnology, GC for photocatalytic experiments was provided by the Chemistry Educational Centre. I. Rodionov also is grateful to RFBR Grant no. 14-03-31968.

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Authors and Affiliations

  1. Saint Petersburg State University, 7-9, Universitetskaya nab., St. Petersburg, 199034, Russia

    Ivan A. Rodionov, Elizaveta V. Mechtaeva, Alena A. Burovikhina, Oleg I. Silyukov, Maria A. Toikka & Irina A. Zvereva

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  1. Ivan A. Rodionov
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  2. Elizaveta V. Mechtaeva
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  3. Alena A. Burovikhina
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  4. Oleg I. Silyukov
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  5. Maria A. Toikka
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  6. Irina A. Zvereva
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Correspondence to Irina A. Zvereva.

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Rodionov, I.A., Mechtaeva, E.V., Burovikhina, A.A. et al. Effect of protonation on the photocatalytic activity of the K2La2Ti3O10 layered oxide in the reaction of hydrogen production. Monatsh Chem 149, 475–482 (2018). https://doi.org/10.1007/s00706-017-2105-7

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  • DOI: https://doi.org/10.1007/s00706-017-2105-7

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