Effect of time of hydrothermal heat treatment on mesoporous nano-TiO2 synthesis
Abstract Mesoporous TiO2 nanoparticles were synthesized by the sol-gel method and using hydrothermal treatment at 200 ºC during different time intervals, which allowed the evaluation of the time or the treatment on the structural, morphological, and optical properties of the oxides. TEM micrographs...
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| Format: | Article |
| Language: | English |
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Associação Brasileira de Cerâmica
2021-11-01
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| Series: | Cerâmica |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132021000400445&tlng=en |
| _version_ | 1798021927403520000 |
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| author | L. M. Santos D. J. R. da Silva M. R. C. Santos A. E. H. Machado |
| author_facet | L. M. Santos D. J. R. da Silva M. R. C. Santos A. E. H. Machado |
| author_sort | L. M. Santos |
| collection | DOAJ |
| description | Abstract Mesoporous TiO2 nanoparticles were synthesized by the sol-gel method and using hydrothermal treatment at 200 ºC during different time intervals, which allowed the evaluation of the time or the treatment on the structural, morphological, and optical properties of the oxides. TEM micrographs showed that the morphology of the materials was characterized by the presence of spherical clusters, while the crystalline phases of the anatase and brookite mixtures were analyzed by X-ray diffraction and Raman spectroscopy. A type IV profile was identified from the results of specific surface area, which is characteristic of the mesoporous material with strong and weak affinity. The band gap in the range of 3.29 and 3.40 eV, estimated by the Kubelka-Munk function, showed a gradual increase as a result of oxide crystallization. It was found that 8 h of treatment in a hydrothermal system was sufficient to synthesize a photocatalyst with optimal photocatalytic performance. This efficiency was probably based on a good correlation between physical and chemical factors, such as high surface area and porosity, the improved capability of photon adsorption in the visible range, crystallinity, and a favorable content of brookite. |
| first_indexed | 2024-04-11T17:21:28Z |
| format | Article |
| id | doaj.art-b97ac5f077d64580a259cc16793ba7b0 |
| institution | Directory Open Access Journal |
| issn | 1678-4553 |
| language | English |
| last_indexed | 2024-04-11T17:21:28Z |
| publishDate | 2021-11-01 |
| publisher | Associação Brasileira de Cerâmica |
| record_format | Article |
| series | Cerâmica |
| spelling | doaj.art-b97ac5f077d64580a259cc16793ba7b02022-12-22T04:12:28ZengAssociação Brasileira de CerâmicaCerâmica1678-45532021-11-016738444545410.1590/0366-69132021673843084Effect of time of hydrothermal heat treatment on mesoporous nano-TiO2 synthesisL. M. Santoshttps://orcid.org/0000-0002-5570-9899D. J. R. da SilvaM. R. C. SantosA. E. H. MachadoAbstract Mesoporous TiO2 nanoparticles were synthesized by the sol-gel method and using hydrothermal treatment at 200 ºC during different time intervals, which allowed the evaluation of the time or the treatment on the structural, morphological, and optical properties of the oxides. TEM micrographs showed that the morphology of the materials was characterized by the presence of spherical clusters, while the crystalline phases of the anatase and brookite mixtures were analyzed by X-ray diffraction and Raman spectroscopy. A type IV profile was identified from the results of specific surface area, which is characteristic of the mesoporous material with strong and weak affinity. The band gap in the range of 3.29 and 3.40 eV, estimated by the Kubelka-Munk function, showed a gradual increase as a result of oxide crystallization. It was found that 8 h of treatment in a hydrothermal system was sufficient to synthesize a photocatalyst with optimal photocatalytic performance. This efficiency was probably based on a good correlation between physical and chemical factors, such as high surface area and porosity, the improved capability of photon adsorption in the visible range, crystallinity, and a favorable content of brookite.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132021000400445&tlng=entitanium dioxidesol-gel synthesismesoporeshydrothermal treatmentheterogeneous photocatalysis |
| spellingShingle | L. M. Santos D. J. R. da Silva M. R. C. Santos A. E. H. Machado Effect of time of hydrothermal heat treatment on mesoporous nano-TiO2 synthesis Cerâmica titanium dioxide sol-gel synthesis mesopores hydrothermal treatment heterogeneous photocatalysis |
| title | Effect of time of hydrothermal heat treatment on mesoporous nano-TiO2 synthesis |
| title_full | Effect of time of hydrothermal heat treatment on mesoporous nano-TiO2 synthesis |
| title_fullStr | Effect of time of hydrothermal heat treatment on mesoporous nano-TiO2 synthesis |
| title_full_unstemmed | Effect of time of hydrothermal heat treatment on mesoporous nano-TiO2 synthesis |
| title_short | Effect of time of hydrothermal heat treatment on mesoporous nano-TiO2 synthesis |
| title_sort | effect of time of hydrothermal heat treatment on mesoporous nano tio2 synthesis |
| topic | titanium dioxide sol-gel synthesis mesopores hydrothermal treatment heterogeneous photocatalysis |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132021000400445&tlng=en |
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