Photoactivity of N-doped ZnO nanoparticles in oxidative and reductive reactions

Autor(es)

Oliveira, Jessica A. ^{[1, 2]} ; Nogueira, Andre E. ^[1] ; Goncalves, Maria C. P. ^[2] ; Paris, Elaine C. ^[1] ; Ribeiro, Caue ^[1] ; Poirier, Gael Y. ^[2] ; Giraldi, Tania R. ^[2]

Afiliação do(s) autor(es)

^[1] Embrapa Instrumentacao, Rua 15 Novembro 1452, BR-13560970 Sao Carlos, SP - Brazil

^[2] Univ Fed Alfenas, Programa Posgrad Ciencia & Engn Mat, Rodovia Jose Aurelio Vilela 11999, Cidade Univ, BR-37715400 Pocos De Caldas, MG - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Applied Surface Science; v. 433, p. 879-886, MAR 1 2018.
• Citações Web of Science: 16

Resumo

N-doped ZnO is a prospective material for photocatalytic reactions. However, only oxidative paths are well investigated in the literature. This paper describes a comparative study about ZnO and ZnO:N potential for oxidative and reductive reactions, probed by rhodamine B dye photodegradation and CO2 photoreduction. The materials were prepared by the polymeric precursor method, using urea as a nitrogen source, and different heat treatments were used to observe their effects on surface decontamination, crystallinity, particle sizes and shapes, and photocatalytic performance. ZnO and ZnO:N presented a wurtzite crystalline structure and nanometric-scale particles. Samples submitted to higher temperatures showed lower specific surface areas, but higher crystallinity and lower contents of species adsorbed on their surfaces. On the other hand, the photocatalysts annealed in shorter times presented smaller crystallite sizes and lower crystallinity. These factors influenced the photoactivity in both conditions, i.e., oxidation and reduction reactions, under the ultraviolet and visible light, indicating that structural factors influenced the adequate charge separation and consequent photocatalytic activity since the as-synthesized samples were versatile photocatalysts in both redox reactions. (C) 2017 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 14/09014-7 - Estudo do potencial de nano-heteroestruturas de óxidos de cobre e nióbio para aplicação em fotossíntese artificial
• Beneficiário: André Esteves Nogueira
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 15/14330-8 - Estudos sobre a síntese e aplicação de heteroestruturas de nanocristais semicondutores em processos de fotossíntese artificial
• Beneficiário: Cauê Ribeiro de Oliveira
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Regular