Photocatalytic Activity and Antibacterial Effect of Ag3PO4 Powders Against Methicillin-resistant Staphylococcus aureus

Autor(es)

Botelho, Gleice ^[1] ; de Foggi, Camila Cristina ^[2] ; Vergani, Carlos Eduardo ^[2] ; Pereira, Wyllamanney Silva ^[3] ; Junior, Ricardo Kaminishi dos Santos ^[1] ; Longo, Elson ^[3]

Afiliação do(s) autor(es)

^[1] Fed Univ Tocantins, Dept Environm Chem, POB 66, BR-77402970 Gurupi, TO - Brazil

^[2] Sao Paulo State Univ, Dept Dent Mat & Prosthodont, POB 355, BR-14801903 Araraquara, SP - Brazil

^[3] Univ Fed Sao Carlos, INCTMN UFSCar, POB 676, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ORBITAL-THE ELECTRONIC JOURNAL OF CHEMISTRY; v. 13, n. 3, p. 241-249, APR-JUN 2021.
• Citações Web of Science: 0

Resumo

In this study, silver phosphate (Ag3PO4) was successfully prepared through a simple precipitation method, and its structural, optical, and morphological properties were characterized by X-ray diffraction, Rietveld refinement, Fourier transform infrared spectroscopy, UV-vis diffuse reflectance spectroscopy, photoluminescence measurements, and field emission scanning electron microscopy (FE-SEM). Thereafter, the photocatalytic activity for the degradation of rhodamine B (RhB) dye and the antibacterial effect against methicillin-resistant Staphylococcus aureus (MRSA) were analyzed. Ag3PO4 was highly photocatalytic, degrading approximately 100% of the RhB after 25 min of visible light exposure. The photocatalytic mechanism was evaluated by trapping experiments indicating that photogenerated holes and superoxide radicals were the principal species present in the photocatalytic system. In addition, Ag3PO4 is a potential bacterial agent as it reduced the MRSA population even at sub-inhibitory concentrations. Morphological changes of the MRSA cells exposed to Ag3PO4 powder were investigated by the FE-SEM analysis, and a possible mechanism involving the release of dissolved Ag+, together with the production of reactive photocatalytic oxygen species is proposed based on the experimental results. (AU)

• Processo FAPESP: 17/12594-3 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Camila Cristina de Foggi
• Modalidade de apoio: Bolsas no Brasil - Pós-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: 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