An approach for photodegradation mechanism at TiO2/SrTiO3 interface

Autor(es)

Coleto, Jr., Ubirajara ^{[1, 2]} ; Amoresi, Rafael A. C. ^{[1, 3]} ; Teodoro, Vinicius ^[4] ; Iani, Isabela M. ^[1] ; Longo, Elson ^[4] ; Zaghete, Maria A. ^[1] ; Perazolli, Leinig A. ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ UNESP, LIEC Chem Inst, Araraquara, SP - Brazil

^[2] Fed Inst Sao Paulo IFSP, Dept Chem, Catanduva, SP - Brazil

^[3] Fac Engn Guaratingueta UNESP, Sao Paulo, SP - Brazil

^[4] Univ Fed Sao Carlos UFSCAR, LIEC Dept Chem, Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS; v. 29, n. 23, p. 20329-20338, DEC 2018.
• Citações Web of Science: 3

Resumo

TiO2/SrTiO3 heterojunction powders were obtained and characterized, and their photocatalytic potential was evaluated. The formation of the solid-solid interface was evidenced by secondary-phase formation in the interface region, which was observed using transmission electron microscopy. The photocatalytic efficiency of the TiO2/SrTiO3 heterojunction was higher than that of pure TiO2 and SrTiO3 samples. The photocatalytic behavior was investigated via scavenger experiments, which indicated that the mechanism of charge transfer for the heterojunction was the direct transfer of the electrons at the interface. A surface compositional analysis of the materials revealed that effective electronic-transfer properties of the materials are more important than the content of pre-adsorbed species on the surface for redox reactions. Photoluminescence spectroscopy analyses showed a reduction in the photoluminescent intensity for the heterojunction and emission in distinct regions depending on the defects formed in the heterojunction. These differences in behavior may be related to the different photocatalytic responses observed for pure compounds and heterojunctions; a broad analysis indicates that the mono ionized vacancies affect the performance of the photocatalyst in the degradation of micropollutants. (AU)

• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 17/19143-7 - Uma abordagem teórico-experimental dos mecanismos de condução e defeitos de interface em heteroestruturas sensoras baseados em semicondutores P-N e N-N a partir de matrizes de CeO2
• Beneficiário: Rafael Aparecido Ciola Amoresi
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado