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Photocatalytic activity evaluation and degradation mechanism of doped semiconductor and graphene heterostructure

Grant number: 15/04511-5
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): August 01, 2015
Effective date (End): July 31, 2018
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
Cooperation agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
Principal Investigator:Elson Longo da Silva
Grantee:Gabriela Byzynski Soares
Home Institution: Instituto de Química (IQ). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil
Associated research grant:13/07296-2 - CDMF - Center for the Development of Functional Materials, AP.CEPID


Photocatalytic processes have been extensively studying due to the elevated potential application, among others organic pollution degradation as pesticides and dyes. Although dopant effect in the efficiency alteration of this process is already known, as the efficiency photocatalytic increasing for heterostructured semiconductor uses, the redox mechanism involved in photocatalytic activity and the use of heterostructured with graphene are not well understood. Thus, the central purpose of this study is to investigate the relative defects contributions, caused in the crystal lattice of different semiconductors by doping element, in the radicals production and sensitization process in organic molecules degradation process. Besides, the evaluation photocatalytic efficiency using heterostructureed of TiO2 or ZnO with graphene to better understand the mechanism involved in photoactive (eg Rhodamine B with maximum absorption at 564 nm) and not photoactive compounds (eg Ametrine, maximum absorption at 230 nm) were done, in order to understand these effects in the sensitization process, with UV and visible light. Spectroscopic and electroanalytical techniques are used to evaluate the efficiency of charge separation and characterization of the heterostructure. (AU)

Scientific publications (6)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
GOTTARDO, BIANCA; LEMES, THIAGO H.; BYZYNSKI, GABRIELA; PAZIANI, MARIO H.; VON-ZESKA-KRESS, MARCIA R.; DE ALMEIDA, MARGARETE T. G.; VOLANTI, DIOGO P. One-Pot Synthesis and Antifungal Activity of Nontoxic Silver-Loaded Hydroxyapatite Nanocomposites against Candida Species. ACS APPLIED NANO MATERIALS, v. 2, n. 4, p. 2112-2120, APR 2019. Web of Science Citations: 1.
BYZYNSKI, GABRIELA; VOLANTI, DIOGO P.; RIBEIRO, CAU; MASTELARO, VALMOR R.; LONGO, ELSON. Direct photo-oxidation and superoxide radical as major responsible for dye photodegradation mechanism promoted by TiO2-rGO heterostructure. JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS, v. 29, n. 19, p. 17022-17037, OCT 2018. Web of Science Citations: 4.
BYZYNSKI, GABRIELA; PEREIRA, ANDREZA PRADO; VOLANTI, DIOGO P.; RIBEIRO, CAUE; LONGO, ELSON. High-performance ultraviolet-visible driven ZnO morphologies photocatalyst obtained by microwave-assisted hydrothermal method. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, v. 353, p. 358-367, FEB 15 2018. Web of Science Citations: 7.
RASCHETTI, MARINA; BYZYNSKI, GABRIELA; RIBEIRO, CAUE; LONGO, ELSON. N-doping SrTiO3@SrCO3 heterostructure electrode: Synthesis, electrochemical characterization, and varistor application. CERAMICS INTERNATIONAL, v. 43, n. 15, p. 11722-11732, OCT 15 2017. Web of Science Citations: 1.
ANGELO PIPI; GABRIELA BYZYNSKI; LUIS RUOTOLO. Photocatalytic Activity and RNO Dye Degradation of Nitrogen-doped TiO2 Prepared by Ionothermal Synthesis. MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS, v. 20, n. 3, p. 628-638, Jun. 2017. Web of Science Citations: 2.
BYZYNSKI, GABRIELA; MELO, CAMILA; VOLANTI, DIOGO P.; FERRER, MATEUS M.; GOUVEIA, AMANDA F.; RIBEIRO, CAUE; ANDRES, JUAN; LONGO, ELSON. The interplay between morphology and photocatalytic activity in ZnO and N-doped ZnO crystals. MATERIALS & DESIGN, v. 120, p. 363-375, APR 15 2017. Web of Science Citations: 26.

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