We initially reported the synthesis, characterization of structural, optical, morphological, and photocatalytic properties of Ag 1.98 Cu 0.02 WO 4 solid solution in this work. The results were compared with the same characterizations performed in pure silver tungstate. Both materials exhibited an orthorhombic structure, with a high degree of crystallinity and purity. Although, a small number of copper atoms in the orthorhombic unit cell of Ag 1.98 Cu 0.02 WO 4 were detected by changes in the X-ray diffraction peak intensity and shift in peak positions corroborates with changes observed in micro-Raman active modes. The decrease in the optical band gap, α-Ag 2 WO 4 (3.05 ± 0.03 eV) to α-Ag 1.98 Cu 0.02 WO 4 (2.93 ± 0.01 eV), determined by diffuse reflectance spectroscopy, confirms the insertion of intermediate levels between valence and conduction bands that could be associated with the Jahn−Teller effect of copper. Field-emission scanning electron microscopy images show several rod-like microcrystals for α-Ag 2 WO 4 , while there are heterogeneous microcrystals for Ag 1.98 Cu 0.02 WO 4 solid solution with an inherent polyhedral shape. The highest photocatalytic performance of α-Ag 1.98 Cu 0.02 WO 4 in the degradation of RhB molecules under visible blue light-emitting device irradiation was achieved at the end of 120 min, therefore 10.61 times faster than pure α-Ag 2 WO 4 and 37.77 times than the photolysis experiment. Through the photocatalytic experiments using the scavenger radicals, the contribution of holes (h + ), singlet oxygen ( 1 O 2 ), superoxide radicals (O 2•− ), and hydroxyl radicals ( • OH) were evaluated, where the holes (h + ), singlet oxygen ( 1 O 2 ), and superoxide radicals (O 2•− ) show the main contribution in the photocatalytic degradation of the RhB molecules to colorless organic compounds, carbon dioxide (CO 2 ), and water (H 2 O).
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