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

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Abstract

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. Graphical abstract: [Figure not available: see fulltext.].

Original languageEnglish
Pages (from-to)475-482
Number of pages8
JournalMonatshefte fur Chemie
Volume149
Issue number2
DOIs
Publication statusPublished - 1 Feb 2018

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Protonation
Hydrogen production
Titration
Oxides
Ion exchange
2-Propanol
Water
Leaching
Suspensions
Substitution reactions
Experiments
Temperature

Scopus subject areas

  • Chemistry(all)

Cite this

@article{da699f30113046958f11b189c695364f,
title = "Effect of protonation on the photocatalytic activity of the K2La2Ti3O10 layered oxide in the reaction of hydrogen production",
abstract = "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. Graphical abstract: [Figure not available: see fulltext.].",
keywords = "Catalysis, Perovskite, Phase transformations, Photolysis, Titanate",
author = "Rodionov, {Ivan A.} and Mechtaeva, {Elizaveta V.} and Burovikhina, {Alena A.} and Silyukov, {Oleg I.} and Toikka, {Maria A.} and Zvereva, {Irina A.}",
year = "2018",
month = "2",
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pages = "475--482",
journal = "Monatshefte fur Chemie",
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TY - JOUR

T1 - Effect of protonation on the photocatalytic activity of the K2La2Ti3O10 layered oxide in the reaction of hydrogen production

AU - Rodionov, Ivan A.

AU - Mechtaeva, Elizaveta V.

AU - Burovikhina, Alena A.

AU - Silyukov, Oleg I.

AU - Toikka, Maria A.

AU - Zvereva, Irina A.

PY - 2018/2/1

Y1 - 2018/2/1

N2 - 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. Graphical abstract: [Figure not available: see fulltext.].

AB - 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. Graphical abstract: [Figure not available: see fulltext.].

KW - Catalysis

KW - Perovskite

KW - Phase transformations

KW - Photolysis

KW - Titanate

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DO - 10.1007/s00706-017-2105-7

M3 - Article

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