Investigation on the photocatalytic performance of Ag4P2O7 microcrystals for the degradation of organic pollutants

Autor(es)

Pereira, Wyllamanney da S. ^[1] ; Gozzo, Cipriano B. ^[1] ; Longo, Elson ^[1] ; Leite, Edson R. ^{[1, 2]} ; Sczancoski, Julio C. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos UFSCar, Dept Chem, Sao Carlos, SP - Brazil

^[2] CNPEM, Brazilian Nanotechnol Natl Lab LNNano, Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Applied Surface Science; v. 493, p. 1195-1204, NOV 1 2019.
• Citações Web of Science: 0

Resumo

The silver-based metal oxides have been considered good photocatalysts for the removal of organic dyes in wastewater treatments. In our knowledge, for the first time, the photoluminescence and photocatalytic properties of silver pyrophosphate (Ag4P2O7) synthesized by the precipitation method have been investigated. The long- and short-range structural ordering was analyzed by means of X-ray diffraction and, Raman and infrared spectroscopies, respectively. The broadband photoluminescence spectrum revealed a typical profile arising from electronic transitions involving intermediary energy levels in the band gap. The photocatalytic efficiency of Ag4P2O7 was monitored for the degradation of rhodamine B and 6G under ultraviolet light irradiation. The reusability and stability of this material as photocatalyst were checked by recycling tests. Different radical scavengers were introduced into reaction medium to detect the main active species involved in the degradation process of rhodamine 6G. Based on our results, a photodegradation mechanism for this synthetic organic dye by using Ag4P2O7 photocatalyst was proposed in detail. (AU)

• Processo FAPESP: 15/11917-8 - Estudo das Propriedades Fotoluminescentes e Fotocatalíticas do Ag4P2O7, Ag3-2xNixPO4 e Ag3-2xCuxPO4
• Beneficiário: Wyllamanney da Silva Sczancoski
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 16/23663-3 - Nanopartículas de pirofosfatos estabilizados por aminoácidos controladas por auto-montagem
• Beneficiário: Wyllamanney da Silva Sczancoski
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• 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: 12/14004-5 - Investigação das propriedades fotoluminescentes e fotocatalíticas de pós de BaWO4 e BaMoO4 puros e dopados com Mn, Cu e Zn
• Beneficiário: Júlio César Sczancoski
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado