Impact of TiO<sub>2</sub> Surface Defects on the Mechanism of Acetaldehyde Decomposition under Irradiation of a Fluorescent Lamp
TiO<sub>2</sub> was placed in heat-treatment at the temperature of 400–500 °C under flow of hydrogen gas in order to introduce some titania surface defects. It was observed that hole centers in TiO<sub>2</sub> were created during its heat treatment up to 450 °C, whereas at 50...
Guardado en:
| Autores principales: | , , , , |
|---|---|
| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
|
| Materias: | |
| Acceso en línea: | https://doaj.org/article/d0bb08822333408294ccf86561ae2bd0 |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| id |
oai:doaj.org-article:d0bb08822333408294ccf86561ae2bd0 |
|---|---|
| record_format |
dspace |
| spelling |
oai:doaj.org-article:d0bb08822333408294ccf86561ae2bd02021-11-25T17:05:24ZImpact of TiO<sub>2</sub> Surface Defects on the Mechanism of Acetaldehyde Decomposition under Irradiation of a Fluorescent Lamp10.3390/catal111112812073-4344https://doaj.org/article/d0bb08822333408294ccf86561ae2bd02021-10-01T00:00:00Zhttps://www.mdpi.com/2073-4344/11/11/1281https://doaj.org/toc/2073-4344TiO<sub>2</sub> was placed in heat-treatment at the temperature of 400–500 °C under flow of hydrogen gas in order to introduce some titania surface defects. It was observed that hole centers in TiO<sub>2</sub> were created during its heat treatment up to 450 °C, whereas at 500 °C some Ti<sup>3+</sup> electron surface defects appeared. The type of titania surface defects had a great impact on the mechanism of acetaldehyde decomposition under irradiation of artificial visible light. Formation of O<sup>•−</sup> defects improved both acetaldehyde decomposition and mineralization due to the increased oxidation of adsorbed acetaldehyde molecules by holes. Contrary to that, the presence of electron traps and oxygen vacancies in titania (Ti<sup>3+</sup> centers) was detrimental for its photocatalytic properties towards acetaldehyde decomposition. It was proved that transformation of acetaldehyde on the TiO<sub>2</sub> with Ti<sup>3+</sup> defects proceeded through formation of butene complexes, similar as on rutile-type TiO<sub>2</sub>. Formed acetic acid, upon further oxidation of butene complexes, was strongly bound with the titania surface and showed high stability under photocatalytic process. Therefore, titania sample heat-treated with H<sub>2</sub> at 500 °C showed much lower photocatalytic activity than that prepared at 450 °C. This study indicated the great impact of titania surface defects (hole traps) in the oxidation of acetaldehyde and opposed one in the case of defects in the form of Ti<sup>3+</sup> and oxygen vacancies. Oxidation abilities of TiO<sub>2</sub> seem to be important in the photocatalytic decomposition of volatile organic compounds (VOCs) such as acetaldehyde.Piotr RychtowskiBeata TrybaHubert FuksMaria Ángeles Lillo-RódenasMaria Carmen Román-MartínezMDPI AGarticleTiO<sub>2</sub>oxygen surface defectsFTIRthermal desorptionacetaldehyde decompositionChemical technologyTP1-1185ChemistryQD1-999ENCatalysts, Vol 11, Iss 1281, p 1281 (2021) |
| institution |
DOAJ |
| collection |
DOAJ |
| language |
EN |
| topic |
TiO<sub>2</sub> oxygen surface defects FTIR thermal desorption acetaldehyde decomposition Chemical technology TP1-1185 Chemistry QD1-999 |
| spellingShingle |
TiO<sub>2</sub> oxygen surface defects FTIR thermal desorption acetaldehyde decomposition Chemical technology TP1-1185 Chemistry QD1-999 Piotr Rychtowski Beata Tryba Hubert Fuks Maria Ángeles Lillo-Ródenas Maria Carmen Román-Martínez Impact of TiO<sub>2</sub> Surface Defects on the Mechanism of Acetaldehyde Decomposition under Irradiation of a Fluorescent Lamp |
| description |
TiO<sub>2</sub> was placed in heat-treatment at the temperature of 400–500 °C under flow of hydrogen gas in order to introduce some titania surface defects. It was observed that hole centers in TiO<sub>2</sub> were created during its heat treatment up to 450 °C, whereas at 500 °C some Ti<sup>3+</sup> electron surface defects appeared. The type of titania surface defects had a great impact on the mechanism of acetaldehyde decomposition under irradiation of artificial visible light. Formation of O<sup>•−</sup> defects improved both acetaldehyde decomposition and mineralization due to the increased oxidation of adsorbed acetaldehyde molecules by holes. Contrary to that, the presence of electron traps and oxygen vacancies in titania (Ti<sup>3+</sup> centers) was detrimental for its photocatalytic properties towards acetaldehyde decomposition. It was proved that transformation of acetaldehyde on the TiO<sub>2</sub> with Ti<sup>3+</sup> defects proceeded through formation of butene complexes, similar as on rutile-type TiO<sub>2</sub>. Formed acetic acid, upon further oxidation of butene complexes, was strongly bound with the titania surface and showed high stability under photocatalytic process. Therefore, titania sample heat-treated with H<sub>2</sub> at 500 °C showed much lower photocatalytic activity than that prepared at 450 °C. This study indicated the great impact of titania surface defects (hole traps) in the oxidation of acetaldehyde and opposed one in the case of defects in the form of Ti<sup>3+</sup> and oxygen vacancies. Oxidation abilities of TiO<sub>2</sub> seem to be important in the photocatalytic decomposition of volatile organic compounds (VOCs) such as acetaldehyde. |
| format |
article |
| author |
Piotr Rychtowski Beata Tryba Hubert Fuks Maria Ángeles Lillo-Ródenas Maria Carmen Román-Martínez |
| author_facet |
Piotr Rychtowski Beata Tryba Hubert Fuks Maria Ángeles Lillo-Ródenas Maria Carmen Román-Martínez |
| author_sort |
Piotr Rychtowski |
| title |
Impact of TiO<sub>2</sub> Surface Defects on the Mechanism of Acetaldehyde Decomposition under Irradiation of a Fluorescent Lamp |
| title_short |
Impact of TiO<sub>2</sub> Surface Defects on the Mechanism of Acetaldehyde Decomposition under Irradiation of a Fluorescent Lamp |
| title_full |
Impact of TiO<sub>2</sub> Surface Defects on the Mechanism of Acetaldehyde Decomposition under Irradiation of a Fluorescent Lamp |
| title_fullStr |
Impact of TiO<sub>2</sub> Surface Defects on the Mechanism of Acetaldehyde Decomposition under Irradiation of a Fluorescent Lamp |
| title_full_unstemmed |
Impact of TiO<sub>2</sub> Surface Defects on the Mechanism of Acetaldehyde Decomposition under Irradiation of a Fluorescent Lamp |
| title_sort |
impact of tio<sub>2</sub> surface defects on the mechanism of acetaldehyde decomposition under irradiation of a fluorescent lamp |
| publisher |
MDPI AG |
| publishDate |
2021 |
| url |
https://doaj.org/article/d0bb08822333408294ccf86561ae2bd0 |
| work_keys_str_mv |
AT piotrrychtowski impactoftiosub2subsurfacedefectsonthemechanismofacetaldehydedecompositionunderirradiationofafluorescentlamp AT beatatryba impactoftiosub2subsurfacedefectsonthemechanismofacetaldehydedecompositionunderirradiationofafluorescentlamp AT hubertfuks impactoftiosub2subsurfacedefectsonthemechanismofacetaldehydedecompositionunderirradiationofafluorescentlamp AT mariaangeleslillorodenas impactoftiosub2subsurfacedefectsonthemechanismofacetaldehydedecompositionunderirradiationofafluorescentlamp AT mariacarmenromanmartinez impactoftiosub2subsurfacedefectsonthemechanismofacetaldehydedecompositionunderirradiationofafluorescentlamp |
| _version_ |
1718412742183878656 |