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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

An approach for photodegradation mechanism at TiO2/SrTiO3 interface

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Author(s):
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]
Total Authors: 7
Affiliation:
[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
Total Affiliations: 4
Document type: Journal article
Source: JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS; v. 29, n. 23, p. 20329-20338, DEC 2018.
Web of Science Citations: 3
Abstract

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)

FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 17/19143-7 - An experimental theoretical approach of conduction mechanisms and interface defects of heterostructure sensors based on P-N and N-N semiconductors from CeO2 matrices
Grantee:Rafael Aparecido Ciola Amoresi
Support Opportunities: Scholarships in Brazil - Post-Doctoral