Hydrothermal Synthesis and Properties of Nanostructured Silica Containing Lanthanide Type Ln–SiO<sub>2</sub> (Ln = La, Ce, Pr, Nd, Eu, Gd, Dy, Yb, Lu)
The nanostructured lanthanide-silica materials of the Ln–SiO<sub>2</sub> type (Ln = La, Ce, Pr, Nd, Eu, Gd, Dy, Yb, Lu) were synthesized by the hydrothermal method at 100 °C, using cetyltrimethylammonium as a structural template, silica gel and sodium silicate as a source of silicon, and...
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MDPI AG
2023-01-01
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| Series: | Nanomaterials |
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| author | Joana M. F. Barros Glauber J. T. Fernandes Marcio D. S. Araujo Dulce M. A. Melo Amanda D. Gondim Valter J. Fernandes Antonio S. Araujo |
| author_facet | Joana M. F. Barros Glauber J. T. Fernandes Marcio D. S. Araujo Dulce M. A. Melo Amanda D. Gondim Valter J. Fernandes Antonio S. Araujo |
| author_sort | Joana M. F. Barros |
| collection | DOAJ |
| description | The nanostructured lanthanide-silica materials of the Ln–SiO<sub>2</sub> type (Ln = La, Ce, Pr, Nd, Eu, Gd, Dy, Yb, Lu) were synthesized by the hydrothermal method at 100 °C, using cetyltrimethylammonium as a structural template, silica gel and sodium silicate as a source of silicon, and lanthanide oxides, with Si/Ln molar ratio = 50. The resulting materials were calcined at 500 °C using nitrogen and air, and characterized by X-ray diffraction (XRD), Fourier-Transform infrared absorption spectroscopy, scanning electron microscopy, thermogravimetry (TG), surface area by the BET method and acidity measurements by n-butylamine adsorption. The XRD and chemical analysis indicated that the SiO<sub>2</sub> presented a hexagonal structure and the incorporation of lanthanides in the structure changes the properties of the Ln–SiO<sub>2</sub> materials. The heavier the lanthanide element, the higher the Si/Ln ratio. The TG curves showed that the decomposition of the structural template occurs in the materials at temperatures below 500 °C. The samples showed variations in specific surface area, mean pore diameter and silica wall thickness, depending on the nature of the lanthanide. The incorporation of different lanthanides in the silica generated acid sites of varied strength. The hydrothermal stability of the Ln–SiO<sub>2</sub> materials evaluated at high temperatures, evidenced that the properties can be controlled for application in adsorption and catalysis processes. |
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| series | Nanomaterials |
| spelling | doaj.art-6747efe76b3b4dc2bb13bf0ef522b7af2023-11-16T17:33:55ZengMDPI AGNanomaterials2079-49912023-01-0113338210.3390/nano13030382Hydrothermal Synthesis and Properties of Nanostructured Silica Containing Lanthanide Type Ln–SiO<sub>2</sub> (Ln = La, Ce, Pr, Nd, Eu, Gd, Dy, Yb, Lu)Joana M. F. Barros0Glauber J. T. Fernandes1Marcio D. S. Araujo2Dulce M. A. Melo3Amanda D. Gondim4Valter J. Fernandes5Antonio S. Araujo6Center of Education and Health, Academic Unit of Biology and Chemistry, Federal University of Campina Grande, Cuite 58175-000, PB, BrazilLaboratory of Catalysis and Petrochemistry, Institute of Chemistry, Federal University of Rio Grande do Norte, Natal 59078-970, RN, BrazilLaboratory of Catalysis and Petrochemistry, Institute of Chemistry, Federal University of Rio Grande do Norte, Natal 59078-970, RN, BrazilInstitute of Chemistry, Federal University of Rio Grande do Norte, Natal 59078-970, RN, BrazilLaboratory of Catalysis and Petrochemistry, Institute of Chemistry, Federal University of Rio Grande do Norte, Natal 59078-970, RN, BrazilLaboratory of Fuels and Lubricants, Institute of Chemistry, Federal University of Rio Grande do Norte, Natal 59078-970, RN, BrazilLaboratory of Catalysis and Petrochemistry, Institute of Chemistry, Federal University of Rio Grande do Norte, Natal 59078-970, RN, BrazilThe nanostructured lanthanide-silica materials of the Ln–SiO<sub>2</sub> type (Ln = La, Ce, Pr, Nd, Eu, Gd, Dy, Yb, Lu) were synthesized by the hydrothermal method at 100 °C, using cetyltrimethylammonium as a structural template, silica gel and sodium silicate as a source of silicon, and lanthanide oxides, with Si/Ln molar ratio = 50. The resulting materials were calcined at 500 °C using nitrogen and air, and characterized by X-ray diffraction (XRD), Fourier-Transform infrared absorption spectroscopy, scanning electron microscopy, thermogravimetry (TG), surface area by the BET method and acidity measurements by n-butylamine adsorption. The XRD and chemical analysis indicated that the SiO<sub>2</sub> presented a hexagonal structure and the incorporation of lanthanides in the structure changes the properties of the Ln–SiO<sub>2</sub> materials. The heavier the lanthanide element, the higher the Si/Ln ratio. The TG curves showed that the decomposition of the structural template occurs in the materials at temperatures below 500 °C. The samples showed variations in specific surface area, mean pore diameter and silica wall thickness, depending on the nature of the lanthanide. The incorporation of different lanthanides in the silica generated acid sites of varied strength. The hydrothermal stability of the Ln–SiO<sub>2</sub> materials evaluated at high temperatures, evidenced that the properties can be controlled for application in adsorption and catalysis processes.https://www.mdpi.com/2079-4991/13/3/382lanthanidessilicahydrothermal synthesisnanostructured materials |
| spellingShingle | Joana M. F. Barros Glauber J. T. Fernandes Marcio D. S. Araujo Dulce M. A. Melo Amanda D. Gondim Valter J. Fernandes Antonio S. Araujo Hydrothermal Synthesis and Properties of Nanostructured Silica Containing Lanthanide Type Ln–SiO<sub>2</sub> (Ln = La, Ce, Pr, Nd, Eu, Gd, Dy, Yb, Lu) Nanomaterials lanthanides silica hydrothermal synthesis nanostructured materials |
| title | Hydrothermal Synthesis and Properties of Nanostructured Silica Containing Lanthanide Type Ln–SiO<sub>2</sub> (Ln = La, Ce, Pr, Nd, Eu, Gd, Dy, Yb, Lu) |
| title_full | Hydrothermal Synthesis and Properties of Nanostructured Silica Containing Lanthanide Type Ln–SiO<sub>2</sub> (Ln = La, Ce, Pr, Nd, Eu, Gd, Dy, Yb, Lu) |
| title_fullStr | Hydrothermal Synthesis and Properties of Nanostructured Silica Containing Lanthanide Type Ln–SiO<sub>2</sub> (Ln = La, Ce, Pr, Nd, Eu, Gd, Dy, Yb, Lu) |
| title_full_unstemmed | Hydrothermal Synthesis and Properties of Nanostructured Silica Containing Lanthanide Type Ln–SiO<sub>2</sub> (Ln = La, Ce, Pr, Nd, Eu, Gd, Dy, Yb, Lu) |
| title_short | Hydrothermal Synthesis and Properties of Nanostructured Silica Containing Lanthanide Type Ln–SiO<sub>2</sub> (Ln = La, Ce, Pr, Nd, Eu, Gd, Dy, Yb, Lu) |
| title_sort | hydrothermal synthesis and properties of nanostructured silica containing lanthanide type ln sio sub 2 sub ln la ce pr nd eu gd dy yb lu |
| topic | lanthanides silica hydrothermal synthesis nanostructured materials |
| url | https://www.mdpi.com/2079-4991/13/3/382 |
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