Structure, optical properties, and photocatalytic activity of alpha-Ag2W0.75Mo0.25O4

Author(s):Show less -

Penha, M. D. ^[1] ; Gouveia, A. F. ^[2] ; Teixeira, M. M. ^[1] ; de Oliveira, R. C. ^[3] ; Assis, M. ^[1] ; Sambrano, J. R. ^[3] ; Yokaichya, F. ^[4] ; Santos, C. C. ^[1] ; Goncalves, R. F. ^[5] ; Li, M. Siu ^[6] ; San-Miguel, M. A. ^[2] ; Andres, J. ^[7] ; Longo, E. ^[1]

Affiliation

^[1] Univ Fed Sao Carlos, CDMF, POB 676, BR-13565905 Sao Carlos - Brazil

^[2] Univ Estadual Campinas, Inst Chem, UNICAMP, BR-13083970 Campinas, SP - Brazil

^[3] Sao Paulo State Univ, UNESP, Modeling & Mol Simulat Grp, Bauru, SP - Brazil

^[4] Helmholtz Zentrum Berlin, D-14109 Berlin - Germany

^[5] Fed Univ Catalao, SetorUniv, UFCat, BR-75704020 Catalao - Brazil

^[6] Univ Sao Paulo, IFSC, POB 369, BR-13560970 Sao Carlos - Brazil

^[7] Univ Jaume 1, Dept Analyt & Phys Chem, Castellon de La Plana 12071 - Spain

• Document type: Journal article
• Source: Materials Research Bulletin; v. 132, DEC 2020.
• Web of Science Citations: 0

Abstract

This article describes the synthesis of alpha-Ag2W0.75Mo0.25O4 using a coprecipitation method followed by microwave irradiation for different times. The samples were characterized using X-ray and neutron diffractions with Rietveld refinement, Raman spectroscopy, X-ray fluorescence, and ultraviolet-visible diffused reflectance spectroscopy, as well as by photoluminescence emissions. To complement and rationalize the experimental results, first-principles calculations were performed. The formation and growth of metallic Ag nanoparticles on the surfaces of alpha-Ag2W0.75Mo0.25O4 were studied by transmission electron microscopy and energy dispersive X-ray spectroscopy. Results show that alpha-Ag2WO4/beta-Ag2MoO4 samples obtained correspond to alpha-Ag2W0.75Mo0.25O4 heterostructure, and the posterior microwave irradiation favors the process of substituting W by Mo, with subsequent formation of a solid solution. Photocatalytic tests were performed to verify the photocatalytic efficiency against the Rhodamine B. Photoluminescence emissions and photocatalytic results showed that the samples obtained at the longest microwave irradiation time promoted the formation of structural defects and enhanced the material properties. (AU)

• FAPESP's process: 16/23891-6 - Computer modeling of condensed matter
• Grantee: Alex Antonelli
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 19/01732-1 - Photocatalytic activity of multifunctional semiconductors: influence of morphology and electron injection
• Grantee: Amanda Fernandes Gouveia
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 19/08928-9 - Modeling and simulations of porous inorganic nanotubes functionalization
• Grantee: Julio Ricardo Sambrano
• Support Opportunities: Regular Research Grants
• 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