Penha, M. D.
Gouveia, A. F.
Teixeira, M. M.
de Oliveira, R. C.
Sambrano, J. R.
Santos, C. C.
Goncalves, R. F.
Li, M. Siu
San-Miguel, M. A.
Total Authors: 13
 Univ Fed Sao Carlos, CDMF, POB 676, BR-13565905 Sao Carlos - Brazil
 Sao Paulo State Univ, UNESP, Modeling & Mol Simulat Grp, Bauru, SP - Brazil
 Helmholtz Zentrum Berlin, D-14109 Berlin - Germany
 Fed Univ Catalao, SetorUniv, UFCat, BR-75704020 Catalao - Brazil
 Univ Sao Paulo, IFSC, POB 369, BR-13560970 Sao Carlos - Brazil
 Univ Jaume 1, Dept Analyt & Phys Chem, Castellon de La Plana 12071 - Spain
Total Affiliations: 7
Materials Research Bulletin;
Web of Science Citations:
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)