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

Author(s)

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

Affiliation

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

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

• Document type: Journal article
• Source: Applied Surface Science; v. 493, p. 1195-1204, NOV 1 2019.
• Web of Science Citations: 0

Abstract

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)

• FAPESP's process: 15/11917-8 - Study of photoluminescent properties and photocatalytic of Ag4P2O7, Ag3-2xNixPO4 and Ag3-2xCuxPO4
• Grantee: Wyllamanney da Silva Sczancoski
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 16/23663-3 - Amino acids-stabilized pyrophosphates nanoparticles controlled by self-assembly
• Grantee: Wyllamanney da Silva Sczancoski
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
• FAPESP's process: 12/14004-5 - Investigation of the photoluminescence and photocatalytic properties of pure and Mn, Cu, and Zn-doped BaWO4 and BaMoO4 powders
• Grantee: Júlio César Sczancoski
• Support Opportunities: Scholarships in Brazil - Post-Doctoral