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

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Effect of protonation on the photocatalytic activity of the K₂La₂Ti₃O₁₀ layered oxide in the reaction of hydrogen production. / Rodionov, Ivan A.; Mechtaeva, Elizaveta V.; Burovikhina, Alena A.; Silyukov, Oleg I.; Toikka, Maria A.; Zvereva, Irina A.

In: Monatshefte fur Chemie, Vol. 149, No. 2, 01.02.2018, p. 475-482.

Research output: Contribution to journal › Article › peer-review

BibTeX

@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, TITANATES, ION-EXCHANGE, PEROVSKITE-LIKE OXIDES, THERMAL-DECOMPOSITION, HYDRATION, RB, NA, LI, NIOBATES, WATER",

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 = feb,

day = "1",

doi = "10.1007/s00706-017-2105-7",

language = "English",

volume = "149",

pages = "475--482",

journal = "Monatshefte fur Chemie",

issn = "0026-9247",

publisher = "Springer Nature",

number = "2",

}

RIS

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

KW - TITANATES

KW - ION-EXCHANGE

KW - PEROVSKITE-LIKE OXIDES

KW - THERMAL-DECOMPOSITION

KW - HYDRATION

KW - RB

KW - NA

KW - LI

KW - NIOBATES

KW - WATER

UR - http://www.scopus.com/inward/record.url?scp=85035341883&partnerID=8YFLogxK

UR - http://www.mendeley.com/research/effect-protonation-photocatalytic-activity-k2la2ti3o10layered-oxide-reaction-hydrogen-production

U2 - 10.1007/s00706-017-2105-7

DO - 10.1007/s00706-017-2105-7

M3 - Article

AN - SCOPUS:85035341883

VL - 149

SP - 475

EP - 482

JO - Monatshefte fur Chemie

JF - Monatshefte fur Chemie

SN - 0026-9247

IS - 2

ER -

ID: 37015925