Influence of Cu substitution on the structural ordering, photocatalytic activity and photoluminescence emission of Ag3-2xCuxPO4 powders

Autor(es)

Pereira, Wyllamanney da S. ^[1] ; Sczancoski, Julio C. ^[1] ; Calderon, Yormary N. C. ^[2] ; Mastelaro, Valmor R. ^[2] ; Botelho, Gleice ^[3] ; Machado, Thales R. ^[1] ; Leite, Edson R. ^[1] ; Longo, Elson ^[1]

Afiliação do(s) autor(es)

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

^[2] Univ Sao Paulo, Inst Fis Sao Carlos, Sao Carlos, SP - Brazil

^[3] UFT, Quim Ambiental, Gurupi, TO - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Applied Surface Science; v. 440, p. 61-72, MAY 15 2018.
• Citações Web of Science: 5

Resumo

Materials presenting high photocatalytic performance and interesting photoluminescence emissions are promising candidates for photodegradation of organic pollutants discharged into natural waters as well as for development of new electro-optical devices, respectively. In this study, Ag3-2xCuxPO4 (x = 0.00, 0.01, 0.02, 0.04 and 0.08) powders were synthesized by the precipitation method. The long- and short-range structural ordering was affected when the copper (Cu) content was increased in the lattice, as identified by X-ray diffraction patterns, Fourier transform infrared spectroscopy and Raman spectroscopy, respectively. The field emission scanning electron microscope and transmission electron microscope revealed a particle system composed of irregular spherical-like microcrystals. The presence of Cu as well as its real amount in the samples were confirmed by means of X-ray photoelectron spectroscopy and inductively coupled plasma-atomic emission spectrometry, respectively. On increasing Cu level, a slight variation was noted on the photocatalytic activity of Ag3-2xCuxPO4 powders for degradation of rhodamine B under visible light irradiation. A photodegradation mechanism was proposed in details. The photoluminescence emissions were explained by electronic transitions involving intermediary energy levels in the band gap. The origin these energy levels was related to defects caused by the substitution of Ag by Cu in the crystalline structure. (C) 2018 Elsevier B.V. All rights reserved. (AU)

• 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
• 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