TY - JOUR

T1 - Photocatalytic Activity and Stability of Organically Modified Layered Perovskite-Like Titanates HLnTiO4 (Ln = La, Nd) in the Reaction of Hydrogen Evolution from Aqueous Methanol

AU - Kurnosenko, Sergei A.

AU - Voytovich, Vladimir V.

AU - Silyukov, Oleg I.

AU - Rodionov, Ivan A.

AU - Zvereva, Irina A.

N1 - Voytovich, V.V.; Silyukov, O.I.; Rodionov, I.A.; Zvereva, I.A. Photocatalytic Activity and Stability of Organically Modified Layered Perovskite-Like Titanates HLnTiO4 (Ln = La, Nd) in the Reaction of Hydrogen Evolution from Aqueous Methanol. Catalysts 2023, 13, 749. https://doi.org/10.3390/ catal13040749

PY - 2023/4/14

Y1 - 2023/4/14

N2 - Two series of hybrid inorganic–organic materials, prepared via interlayer organic modification of protonated Ruddlesden–Popper phases HLnTiO4(Ln = La, Nd) with n-alkylamines andn-alkoxy groups of various lengths, have been systematically studied with respect to photocatalytichydrogen evolution from aqueous methanol under near-ultraviolet irradiation for the first time.Photocatalytic measurements were organized in such a way as to control a wide range of parameters,including the hydrogen generation rate, quantum efficiency of the reaction, potential dark activity ofthe sample, its actual volume concentration in the suspension, pH of the medium and stability ofthe photocatalytic material under the operating conditions. The insertion of the organic modifiersinto the interlayer space of the titanates allowed obtaining new, more efficient photocatalytic materials, being up to 68 and 29 times superior in the activity in comparison with the initial unmodifiedcompounds HLnTiO4 and a reference photocatalyst TiO2 P25 Degussa, respectively. The hydrogen evolution rate over the samples correlates with the extent of their interlayer hydration, as in thecase of the inorganic–organic derivatives of other layered perovskites reported earlier. However, theHLnTiO4-based samples demonstrate increased stability with regard to the photodegradation of theinterlayer organic components as compared with related H2Ln2Ti3O10-based hybrid materials.

AB - Two series of hybrid inorganic–organic materials, prepared via interlayer organic modification of protonated Ruddlesden–Popper phases HLnTiO4(Ln = La, Nd) with n-alkylamines andn-alkoxy groups of various lengths, have been systematically studied with respect to photocatalytichydrogen evolution from aqueous methanol under near-ultraviolet irradiation for the first time.Photocatalytic measurements were organized in such a way as to control a wide range of parameters,including the hydrogen generation rate, quantum efficiency of the reaction, potential dark activity ofthe sample, its actual volume concentration in the suspension, pH of the medium and stability ofthe photocatalytic material under the operating conditions. The insertion of the organic modifiersinto the interlayer space of the titanates allowed obtaining new, more efficient photocatalytic materials, being up to 68 and 29 times superior in the activity in comparison with the initial unmodifiedcompounds HLnTiO4 and a reference photocatalyst TiO2 P25 Degussa, respectively. The hydrogen evolution rate over the samples correlates with the extent of their interlayer hydration, as in thecase of the inorganic–organic derivatives of other layered perovskites reported earlier. However, theHLnTiO4-based samples demonstrate increased stability with regard to the photodegradation of theinterlayer organic components as compared with related H2Ln2Ti3O10-based hybrid materials.

KW - фотокатализ; водород; слоистый перовскит; титанат; интеркаляция; графтинг

KW - photocatalysis

KW - hydrogen

KW - layered perovskite

KW - titanate

KW - intercalation

KW - grafting

UR - https://www.mdpi.com/2073-4344/13/4/749

M3 - Article

VL - 13

JO - Catalysts

JF - Catalysts

SN - 2073-4344

M1 - 749

ER -