Título: | CHARGE TRANSFER COMPLEXES WITH HIGH SURFACE AREA BASED ON TIO2 NANOPARTICLES MODIFIED WITH BIDENTATE LIGANDS: SYNTHESIS, CHARACTERIZATION AND PHOTOCATALYTIC ACTIVITY UNDER LOW-POWER VISIBLE LIGHT | ||||||||||||
Autor: |
LUCAS ARAUJO LIMA ALMEIDA |
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Colaborador(es): |
BOJAN MARINKOVIC - Orientador |
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Catalogação: | 21/NOV/2023 | Língua(s): | ENGLISH - UNITED STATES |
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Tipo: | TEXT | Subtipo: | THESIS | ||||||||||
Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
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Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=65010&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=65010&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.65010 | ||||||||||||
Resumo: | |||||||||||||
Visible light-sensitive TiO2-based nanomaterials are among the most
promising alternatives for photocatalytic applications, such as environmental
remediation. The charge transfer complexes (CTCs) between nano-TiO2 and
bidentate ligands, an alternative, have been widely studied. However, the
photodegradation efficiency and role of reactive oxidizing species (ROS) are not
fully understood. In addition, the development of CTCs based on TiO2 modified
with malonic acid (MoA) have not yet been investigated, as far as the authors know.
In this study, TiO2-Acetylacetone (ACAC) and TiO2-MoA CTCs with high surface
area were synthesized via sol-gel route. Both as-prepared TiO2-based CTCs were
subjected to tetracycline and chlorophenol photocatalytic degradation tests with and
without ROS scavengers under low-power visible light (26 W). The TiO2-MoA
CTCs were fully characterized by XRPD, MS-TGA, FTIR, N2 adsorption-desorption, DRS, PL, EPR and XPS analysis. The sol-gel synthesis and the
calcination process adopted produced CTCs of nano-TiO2 anatase strongly bond
(covalent bond) with acetylacetone and malonic acid, capable of absorbing along
the visible spectrum when calcined at 300 degrees C (TiO2-ACAC-300) and 270 degrees C (TiO2-
MoA-270). Both calcined CTCs present single electron trapped in oxygen vacancy
(SETOV / F +color center). The TiO2-MoA-270 CTCs showed very high surface
areas (>306 m2.g-1), mesopore volumes (>0.339 mL.g-1) and the highest photocatalytic activity, degrading approximately 100 percent of the TC after 6 h. The TiO2-MoA-270 and TiO2-A300 CTCs were an efficient source of *O2- radicals and inefficient generation of OH*
radicals. The findings of this research can be applied to the synthesis, via sol-gel, of other CTCs, such as dicarboxylic acids, and explored in further studies on air purification and hydrogen production.
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