Boosted Photocatalytic Activities of Ag₂CrO₄ through Eu³⁺-Doping Process

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Souza, Josiane C. ; Lemos, Samantha C. S. ; Assis, Marcelo ; Fernandes, Carlos H. M. ; Ribeiro, Lara K. ; Nunez-de la Rosa, Yeison ; Teodoro, Marcio D. ; Gracia, Lourdes ; Andres, Juan ; Mascaro, Lucia H. ; Longo, Elson

• Tipo de documento: Artigo Científico
• Fonte: ACS OMEGA; v. 9, n. 33, p. 11-pg., 2024-08-07.

Resumo

Ag2CrO4 is a representative member of a family of Ag-containing semiconductors with highly efficient visible-light-driven responsive photocatalysts. The doping process with Eu3+ is known to effectively tune their properties, thus opening opportunities for investigations and application. Here, we report the enhancement of the photocatalytic activity and stability of Ag2CrO4 by introducing Eu(3+)cations. The structural, electronic, and photocatalytic properties of Ag2CrO4:xEu(3+ )(x = 0, 0.25, 0.5, 1%) synthesized using the coprecipitation method were systematically discussed, and their photodegradation activity against rhodamine B (RhB), ciprofloxacin hydrochloride monohydrate (CIP), and 4-nitrophenol (4-NP) was evaluated. Structural analyses reveal a short-range symmetry breaking in the Ag2CrO4 lattice after Eu3+ doping, influencing the material morphology, size, and electronic properties. XPS analysis confirmed the incorporation of Eu3+ and alteration of the surface oxygen species. Furthermore, photoluminescence measurements indicated that the doping process was responsible for reducing recombination processes. The sample doped with 0.25% Eu3+ exhibited superior photocatalytic performance compared to pure Ag2CrO4. Scavenger experiments revealed an increase in the degradation via center dot OH reactive species for the sample doped with 0.25% Eu3+. DFT calculations provided atomic-scale insights into the structural and electronic changes induced by the Eu(3+ )doping process in the Ag2CrO4 host lattice. This study confirms that Eu3+ doping alters the band structure, enabling different degradation paths and boosting the separation/transfer of photogenerated charges, thereby improving the overall photocatalytic performance. (AU)

• Processo FAPESP: 23/12399-7 - Influência do doping de terras raras na estrutura do fotoânodo de BiVO4 para degradação de biomassa e geração de combustíveis
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