Imparato, Claudio
(2018)
Titanium dioxide based hybrid materials for advanced oxidation processes.
[Tesi di dottorato]
| Tipologia del documento: |
Tesi di dottorato
|
| Lingua: |
English |
| Titolo: |
Titanium dioxide based hybrid materials for advanced oxidation processes |
| Autori: |
| Autore | Email |
|---|
| Imparato, Claudio | claudio.imparato@unina.it |
|
| Data: |
11 Dicembre 2018 |
| Numero di pagine: |
188 |
| Istituzione: |
Università degli Studi di Napoli Federico II |
| Dipartimento: |
Ingegneria Chimica, dei Materiali e della Produzione Industriale |
| Dottorato: |
Ingegneria dei prodotti e dei processi industriali |
| Ciclo di dottorato: |
31 |
| Coordinatore del Corso di dottorato: |
| nome | email |
|---|
| Mensitieri, Giuseppe | [non definito] |
|
| Tutor: |
| nome | email |
|---|
| Aronne, Antonio | [non definito] |
|
| Data: |
11 Dicembre 2018 |
| Numero di pagine: |
188 |
| Parole chiave: |
TiO2; sol-gel; xerogel; thin film; synthesis; characterization; EPR; heterogeneous catalysis; ROS; superoxide radical; oxidative degradation; organic pollutants; charge transfer; photocatalysis; photosensitization; photoreforming. |
| Settori scientifico-disciplinari del MIUR: |
Area 03 - Scienze chimiche > CHIM/07 - Fondamenti chimici delle tecnologie |
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| Depositato il: |
07 Gen 2019 23:42 |
| Ultima modifica: |
22 Giu 2020 09:06 |
| URI: |
http://www.fedoa.unina.it/id/eprint/12620 |
Abstract
A simple and versatile sol-gel route was designed and optimized to synthesize hybrid inorganic-organic TiO2 materials with complexing organic molecules (diketones, enediols, carboxylic acids) in the form of gels, small particles or stable sols. A wide characterization of the structural, morphological, optical, electronic and photoelectrochemical properties of xerogels and thin films was carried out. The physicochemical and photoresponsive properties vary strongly depending on the organic component.
Ligand-to-metal charge transfer complexes in the amorphous hybrid gels allow a direct photosensitization, a recently studied mechanism of visible light activation of TiO2. Some classes of organic ligands induce the generation of superoxide radicals and their extraordinarily stable adsorption (several months) on the surface of hybrid samples. This results in oxidative catalytic activity of the materials toward aqueous pollutants in the dark, mediated by reactive oxygen species.
Moreover, a simple thermal annealing of TiO2-acetylacetonate hybrid gels produces non-stoichiometric anatase samples containing structural defects and exhibiting remarkable performances in photocatalytic hydrogen production without a metal co-catalyst.
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