Formation of cobalt hydroxosilicate in amorphous silica matrix
The synthesis of cobalt hydroxysilicate Co3(Si2O5)2(OH)2 in a matrix of high dispersity amorphous silica has been proposed. It is shown the formation of a hydroxosilicate, which combines coordinated silica and cobalt-oxygen polyhedrons in the overall structure, as well as the availability of surfac...
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| Format: | Article |
| Language: | Russian |
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Tver State University
2022-12-01
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| Series: | Физико-химические аспекты изучения кластеров, наноструктур и наноматериалов |
| Subjects: | |
| Online Access: | https://physchemaspects.ru/2022/doi-10-26456-pcascnn-2022-14-800/?lang=en |
| _version_ | 1797980355340271616 |
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| author | I.S. Medyankina K.I. Svetlakova L.A. Pasechnik |
| author_facet | I.S. Medyankina K.I. Svetlakova L.A. Pasechnik |
| author_sort | I.S. Medyankina |
| collection | DOAJ |
| description | The synthesis of cobalt hydroxysilicate Co3(Si2O5)2(OH)2 in a matrix of high dispersity amorphous silica has been proposed. It is shown the formation of a hydroxosilicate, which combines coordinated silica and cobalt-oxygen polyhedrons in the overall structure, as well as the availability of surface hydroxyl groups, contribute to the preservation of a high specific surface area as is in amorphous SiO2. The hydroxosilicate also contributes to the effective manifestation of photocatalytic properties due to the presence of cobalt (2+), which has a high reactivity. As methods of synthesis of SiO2/Сo composites hydrochemical methods are used by impregnation and autoclave treatment with solution of cobalt formate of silica. The influence of the amount of introduced cobalt on the composition, structure, and properties of a composite material containing Co3(Si2O5)2(OH)2 in a SiO2 matrix has been traced. SiO2/Co composites have been tested in the hydroquinone photooxidation reaction when exposed to ultraviolet radiation. The highest degree of hydroquinone decomposition amounting to 84% in 18 hours was achieved for SiO2/Co at a molar ratio of components Co:Si = 0.01:1. |
| first_indexed | 2024-04-11T05:53:03Z |
| format | Article |
| id | doaj.art-5924da73f89b43038cc9340eafc9c6f2 |
| institution | Directory Open Access Journal |
| issn | 2226-4442 2658-4360 |
| language | Russian |
| last_indexed | 2024-04-11T05:53:03Z |
| publishDate | 2022-12-01 |
| publisher | Tver State University |
| record_format | Article |
| series | Физико-химические аспекты изучения кластеров, наноструктур и наноматериалов |
| spelling | doaj.art-5924da73f89b43038cc9340eafc9c6f22022-12-22T04:42:00ZrusTver State UniversityФизико-химические аспекты изучения кластеров, наноструктур и наноматериалов2226-44422658-43602022-12-011480081010.26456/pcascnn/2022.14.800Formation of cobalt hydroxosilicate in amorphous silica matrixI.S. Medyankina0K.I. Svetlakova1 L.A. Pasechnik2Institute of Solid State Chemistry of the Ural Branch of RAS, Yekaterinburg, RussiaUral Federal University named after the first President of B.N. Yeltsin, RussiaInstitute of Solid State Chemistry of the Ural Branch of RAS, Yekaterinburg, Russia The synthesis of cobalt hydroxysilicate Co3(Si2O5)2(OH)2 in a matrix of high dispersity amorphous silica has been proposed. It is shown the formation of a hydroxosilicate, which combines coordinated silica and cobalt-oxygen polyhedrons in the overall structure, as well as the availability of surface hydroxyl groups, contribute to the preservation of a high specific surface area as is in amorphous SiO2. The hydroxosilicate also contributes to the effective manifestation of photocatalytic properties due to the presence of cobalt (2+), which has a high reactivity. As methods of synthesis of SiO2/Сo composites hydrochemical methods are used by impregnation and autoclave treatment with solution of cobalt formate of silica. The influence of the amount of introduced cobalt on the composition, structure, and properties of a composite material containing Co3(Si2O5)2(OH)2 in a SiO2 matrix has been traced. SiO2/Co composites have been tested in the hydroquinone photooxidation reaction when exposed to ultraviolet radiation. The highest degree of hydroquinone decomposition amounting to 84% in 18 hours was achieved for SiO2/Co at a molar ratio of components Co:Si = 0.01:1. https://physchemaspects.ru/2022/doi-10-26456-pcascnn-2022-14-800/?lang=enamorphous silicacobalt silicatehydrothermal synthesismechanosynthesismicrostructurephotocatalysishydroquinone |
| spellingShingle | I.S. Medyankina K.I. Svetlakova L.A. Pasechnik Formation of cobalt hydroxosilicate in amorphous silica matrix Физико-химические аспекты изучения кластеров, наноструктур и наноматериалов amorphous silica cobalt silicate hydrothermal synthesis mechanosynthesis microstructure photocatalysis hydroquinone |
| title | Formation of cobalt hydroxosilicate in amorphous silica matrix |
| title_full | Formation of cobalt hydroxosilicate in amorphous silica matrix |
| title_fullStr | Formation of cobalt hydroxosilicate in amorphous silica matrix |
| title_full_unstemmed | Formation of cobalt hydroxosilicate in amorphous silica matrix |
| title_short | Formation of cobalt hydroxosilicate in amorphous silica matrix |
| title_sort | formation of cobalt hydroxosilicate in amorphous silica matrix |
| topic | amorphous silica cobalt silicate hydrothermal synthesis mechanosynthesis microstructure photocatalysis hydroquinone |
| url | https://physchemaspects.ru/2022/doi-10-26456-pcascnn-2022-14-800/?lang=en |
| work_keys_str_mv | AT ismedyankina formationofcobalthydroxosilicateinamorphoussilicamatrix AT kisvetlakova formationofcobalthydroxosilicateinamorphoussilicamatrix AT lapasechnik formationofcobalthydroxosilicateinamorphoussilicamatrix |