Photocatalytic Activity and Stability of Organically Modified Layered Perovskite-like Titanates HLnTiO<sub>4</sub> (Ln = La, Nd) in the Reaction of Hydrogen Evolution from Aqueous Methanol
Two series of hybrid inorganic–organic materials, prepared via interlayer organic modification of protonated Ruddlesden–Popper phases HLnTiO<sub>4</sub> (Ln = La, Nd) with <i>n</i>-alkylamines and <i>n</i>-alkoxy groups of various lengths, have been systematically...
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2023-04-01
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| author | Sergei A. Kurnosenko Vladimir V. Voytovich Oleg I. Silyukov Ivan A. Rodionov Irina A. Zvereva |
| author_facet | Sergei A. Kurnosenko Vladimir V. Voytovich Oleg I. Silyukov Ivan A. Rodionov Irina A. Zvereva |
| author_sort | Sergei A. Kurnosenko |
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| description | Two series of hybrid inorganic–organic materials, prepared via interlayer organic modification of protonated Ruddlesden–Popper phases HLnTiO<sub>4</sub> (Ln = La, Nd) with <i>n</i>-alkylamines and <i>n</i>-alkoxy groups of various lengths, have been systematically studied with respect to photocatalytic hydrogen 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 of the sample, its actual volume concentration in the suspension, pH of the medium and stability of the photocatalytic material under the operating conditions. The insertion of the organic modifiers into 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 unmodified compounds HLnTiO<sub>4</sub> and a reference photocatalyst TiO<sub>2</sub> P25 Degussa, respectively. The hydrogen evolution rate over the samples correlates with the extent of their interlayer hydration, as in the case of the inorganic–organic derivatives of other layered perovskites reported earlier. However, the HLnTiO<sub>4</sub>-based samples demonstrate increased stability with regard to the photodegradation of the interlayer organic components as compared with related H<sub>2</sub>Ln<sub>2</sub>Ti<sub>3</sub>O<sub>10</sub>-based hybrid materials. |
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| spelling | doaj.art-85b3812e58f549e58382c5782d2c6f612023-11-17T18:42:02ZengMDPI AGCatalysts2073-43442023-04-0113474910.3390/catal13040749Photocatalytic Activity and Stability of Organically Modified Layered Perovskite-like Titanates HLnTiO<sub>4</sub> (Ln = La, Nd) in the Reaction of Hydrogen Evolution from Aqueous MethanolSergei A. Kurnosenko0Vladimir V. Voytovich1Oleg I. Silyukov2Ivan A. Rodionov3Irina A. Zvereva4Department of Chemical Thermodynamics and Kinetics, Institute of Chemistry, Saint Petersburg State University, 199034 Saint Petersburg, RussiaDepartment of Chemical Thermodynamics and Kinetics, Institute of Chemistry, Saint Petersburg State University, 199034 Saint Petersburg, RussiaDepartment of Chemical Thermodynamics and Kinetics, Institute of Chemistry, Saint Petersburg State University, 199034 Saint Petersburg, RussiaDepartment of Chemical Thermodynamics and Kinetics, Institute of Chemistry, Saint Petersburg State University, 199034 Saint Petersburg, RussiaDepartment of Chemical Thermodynamics and Kinetics, Institute of Chemistry, Saint Petersburg State University, 199034 Saint Petersburg, RussiaTwo series of hybrid inorganic–organic materials, prepared via interlayer organic modification of protonated Ruddlesden–Popper phases HLnTiO<sub>4</sub> (Ln = La, Nd) with <i>n</i>-alkylamines and <i>n</i>-alkoxy groups of various lengths, have been systematically studied with respect to photocatalytic hydrogen 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 of the sample, its actual volume concentration in the suspension, pH of the medium and stability of the photocatalytic material under the operating conditions. The insertion of the organic modifiers into 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 unmodified compounds HLnTiO<sub>4</sub> and a reference photocatalyst TiO<sub>2</sub> P25 Degussa, respectively. The hydrogen evolution rate over the samples correlates with the extent of their interlayer hydration, as in the case of the inorganic–organic derivatives of other layered perovskites reported earlier. However, the HLnTiO<sub>4</sub>-based samples demonstrate increased stability with regard to the photodegradation of the interlayer organic components as compared with related H<sub>2</sub>Ln<sub>2</sub>Ti<sub>3</sub>O<sub>10</sub>-based hybrid materials.https://www.mdpi.com/2073-4344/13/4/749photocatalysishydrogenlayered perovskitetitanateintercalationgrafting |
| spellingShingle | Sergei A. Kurnosenko Vladimir V. Voytovich Oleg I. Silyukov Ivan A. Rodionov Irina A. Zvereva Photocatalytic Activity and Stability of Organically Modified Layered Perovskite-like Titanates HLnTiO<sub>4</sub> (Ln = La, Nd) in the Reaction of Hydrogen Evolution from Aqueous Methanol Catalysts photocatalysis hydrogen layered perovskite titanate intercalation grafting |
| title | Photocatalytic Activity and Stability of Organically Modified Layered Perovskite-like Titanates HLnTiO<sub>4</sub> (Ln = La, Nd) in the Reaction of Hydrogen Evolution from Aqueous Methanol |
| title_full | Photocatalytic Activity and Stability of Organically Modified Layered Perovskite-like Titanates HLnTiO<sub>4</sub> (Ln = La, Nd) in the Reaction of Hydrogen Evolution from Aqueous Methanol |
| title_fullStr | Photocatalytic Activity and Stability of Organically Modified Layered Perovskite-like Titanates HLnTiO<sub>4</sub> (Ln = La, Nd) in the Reaction of Hydrogen Evolution from Aqueous Methanol |
| title_full_unstemmed | Photocatalytic Activity and Stability of Organically Modified Layered Perovskite-like Titanates HLnTiO<sub>4</sub> (Ln = La, Nd) in the Reaction of Hydrogen Evolution from Aqueous Methanol |
| title_short | Photocatalytic Activity and Stability of Organically Modified Layered Perovskite-like Titanates HLnTiO<sub>4</sub> (Ln = La, Nd) in the Reaction of Hydrogen Evolution from Aqueous Methanol |
| title_sort | photocatalytic activity and stability of organically modified layered perovskite like titanates hlntio sub 4 sub ln la nd in the reaction of hydrogen evolution from aqueous methanol |
| topic | photocatalysis hydrogen layered perovskite titanate intercalation grafting |
| url | https://www.mdpi.com/2073-4344/13/4/749 |
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