THE INFLUENCE OF THE PHASE COMPOSITION OF MIXED-PHASE MESOPOROUS TiO2 ON ITS PHOTOCATALYTIC ACTIVITY IN THE REACTION OF HYDROGEN EVOLUTION FROM AN AQUEOUS-ETHANOL MIXTURE
Two- and three-phase compositions of mesoporous nanocrystalline TiO2 (meso-nc-TiO2) were obtained from sol-gel reaction mixtures (ZGRM) using dibenzo-18-crown-6 (DВ18С6) as a structure-directing agent and titanium tetrabutoxide (TBOT) as a source of titanium in the presence of HCl with (or without)...
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| Date: | 2024 |
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V.I.Vernadsky Institute of General and Inorganic Chemistry
2024
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oai:ojs2.1444248.nisspano.web.hosting-test.net:article-6262024-11-19T15:10:13Z THE INFLUENCE OF THE PHASE COMPOSITION OF MIXED-PHASE MESOPOROUS TiO2 ON ITS PHOTOCATALYTIC ACTIVITY IN THE REACTION OF HYDROGEN EVOLUTION FROM AN AQUEOUS-ETHANOL MIXTURE Ermokhina, Natalia Shvalagin, Vitalii Korzhak, Anna Grebennikov, Volodymyr Romanovska, Natalia Shulzshenko , Alexander Shcherbatyuk , Mykola Klymchuk , Dmytro Manoryk , Petro sol-gel synthesis, mesoporous TiO2anatase-rutile-brookite compositions, H2 release. Two- and three-phase compositions of mesoporous nanocrystalline TiO2 (meso-nc-TiO2) were obtained from sol-gel reaction mixtures (ZGRM) using dibenzo-18-crown-6 (DВ18С6) as a structure-directing agent and titanium tetrabutoxide (TBOT) as a source of titanium in the presence of HCl with (or without) subsequent hydrothermal treatment (HTT) and calcination at 500 oC. It has been shown that the addition of a small amount of dodecyldimethylethylammonium bromide (DDMEABr) and/or lanthanum salts in ZGRM, as well as HTT, has a significant effect on the phase composition and texture of the samples. It was established that the use of HTT before calcination of samples significantly increases their photocatalytic activity (PhA) in the reaction of photocatalytic hydrogen release from an aqueous-ethanol mixture mainly due to changes in their phase composition. The hydrothermally treated sample of the anatase (85%)/rutile (4%)/brookite (11%) phase composition shows the highest photocatalytic activity, which is 2.5 times higher than the corresponding characteristic for the commercial Evonik P25 photocatalyst. It is shown that the size of the specific surface area of the sample is not the dominant factor influencing the photocatalytic activity of the obtained mixed-phase meso-nc-TiO2 samples in the process of hydrogen release from the aqueous-ethanol mixture. V.I.Vernadsky Institute of General and Inorganic Chemistry 2024-01-26 Article Article Physical chemistry Физическая xимия Фізична xімія application/pdf https://ucj.org.ua/index.php/journal/article/view/626 10.33609/2708-129X.89.12.2023.88-109 Ukrainian Chemistry Journal; Vol. 89 No. 12 (2023): Ukrainian Chemistry Journal; 88-109 Украинский химический журнал; Том 89 № 12 (2023): Ukrainian Chemistry Journal; 88-109 Український хімічний журнал; Том 89 № 12 (2023): Ukrainian Chemistry Journal; 88-109 2708-129X 2708-1281 en https://ucj.org.ua/index.php/journal/article/view/626/312 |
| institution |
Ukrainian Chemistry Journal |
| baseUrl_str |
|
| datestamp_date |
2024-11-19T15:10:13Z |
| collection |
OJS |
| language |
English |
| topic_facet |
sol-gel synthesis mesoporous TiO2anatase-rutile-brookite compositions H2 release. |
| format |
Article |
| author |
Ermokhina, Natalia Shvalagin, Vitalii Korzhak, Anna Grebennikov, Volodymyr Romanovska, Natalia Shulzshenko , Alexander Shcherbatyuk , Mykola Klymchuk , Dmytro Manoryk , Petro |
| spellingShingle |
Ermokhina, Natalia Shvalagin, Vitalii Korzhak, Anna Grebennikov, Volodymyr Romanovska, Natalia Shulzshenko , Alexander Shcherbatyuk , Mykola Klymchuk , Dmytro Manoryk , Petro THE INFLUENCE OF THE PHASE COMPOSITION OF MIXED-PHASE MESOPOROUS TiO2 ON ITS PHOTOCATALYTIC ACTIVITY IN THE REACTION OF HYDROGEN EVOLUTION FROM AN AQUEOUS-ETHANOL MIXTURE |
| author_facet |
Ermokhina, Natalia Shvalagin, Vitalii Korzhak, Anna Grebennikov, Volodymyr Romanovska, Natalia Shulzshenko , Alexander Shcherbatyuk , Mykola Klymchuk , Dmytro Manoryk , Petro |
| author_sort |
Ermokhina, Natalia |
| title |
THE INFLUENCE OF THE PHASE COMPOSITION OF MIXED-PHASE MESOPOROUS TiO2 ON ITS PHOTOCATALYTIC ACTIVITY IN THE REACTION OF HYDROGEN EVOLUTION FROM AN AQUEOUS-ETHANOL MIXTURE |
| title_short |
THE INFLUENCE OF THE PHASE COMPOSITION OF MIXED-PHASE MESOPOROUS TiO2 ON ITS PHOTOCATALYTIC ACTIVITY IN THE REACTION OF HYDROGEN EVOLUTION FROM AN AQUEOUS-ETHANOL MIXTURE |
| title_full |
THE INFLUENCE OF THE PHASE COMPOSITION OF MIXED-PHASE MESOPOROUS TiO2 ON ITS PHOTOCATALYTIC ACTIVITY IN THE REACTION OF HYDROGEN EVOLUTION FROM AN AQUEOUS-ETHANOL MIXTURE |
| title_fullStr |
THE INFLUENCE OF THE PHASE COMPOSITION OF MIXED-PHASE MESOPOROUS TiO2 ON ITS PHOTOCATALYTIC ACTIVITY IN THE REACTION OF HYDROGEN EVOLUTION FROM AN AQUEOUS-ETHANOL MIXTURE |
| title_full_unstemmed |
THE INFLUENCE OF THE PHASE COMPOSITION OF MIXED-PHASE MESOPOROUS TiO2 ON ITS PHOTOCATALYTIC ACTIVITY IN THE REACTION OF HYDROGEN EVOLUTION FROM AN AQUEOUS-ETHANOL MIXTURE |
| title_sort |
influence of the phase composition of mixed-phase mesoporous tio2 on its photocatalytic activity in the reaction of hydrogen evolution from an aqueous-ethanol mixture |
| description |
Two- and three-phase compositions of mesoporous nanocrystalline TiO2 (meso-nc-TiO2) were obtained from sol-gel reaction mixtures (ZGRM) using dibenzo-18-crown-6 (DВ18С6) as a structure-directing agent and titanium tetrabutoxide (TBOT) as a source of titanium in the presence of HCl with (or without) subsequent hydrothermal treatment (HTT) and calcination at 500 oC.
It has been shown that the addition of a small amount of dodecyldimethylethylammonium bromide (DDMEABr) and/or lanthanum salts in ZGRM, as well as HTT, has a significant effect on the phase composition and texture of the samples. It was established that the use of HTT before calcination of samples significantly increases their photocatalytic activity (PhA) in the reaction of photocatalytic hydrogen release from an aqueous-ethanol mixture mainly due to changes in their phase composition.
The hydrothermally treated sample of the anatase (85%)/rutile (4%)/brookite (11%) phase composition shows the highest photocatalytic activity, which is 2.5 times higher than the corresponding characteristic for the commercial Evonik P25 photocatalyst. It is shown that the size of the specific surface area of the sample is not the dominant factor influencing the photocatalytic activity of the obtained mixed-phase meso-nc-TiO2 samples in the process of hydrogen release from the aqueous-ethanol mixture. |
| publisher |
V.I.Vernadsky Institute of General and Inorganic Chemistry |
| publishDate |
2024 |
| url |
https://ucj.org.ua/index.php/journal/article/view/626 |
| work_keys_str_mv |
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2025-09-24T17:43:54Z |
| last_indexed |
2025-09-24T17:43:54Z |
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