Dataset Information

Boosted Photocatalytic Activities of Ag₂CrO₄ through Eu³⁺-Doping Process.

ABSTRACT: 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 Eu³⁺cations. The structural, electronic, and photocatalytic properties of Ag₂CrO₄:xEu³⁺ (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 ^•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 Eu³⁺ 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.

SUBMITTER: Souza JC

PROVIDER: S-EPMC11339825 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature

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Boosted Photocatalytic Activities of Ag2CrO4 through Eu3+-Doping Process.

Souza Josiane C JC Lemos Samantha C S SCS Assis Marcelo M Fernandes Carlos H M CHM Ribeiro Lara K LK Núñez-de la Rosa Yeison Y Teodoro Márcio D MD Gracia Lourdes L Andrés Juan J Mascaro Lucia H LH Longo Elson E

ACS omega 20240807 33

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 Eu3+cations. The structural, electronic, an ...[more]

PMID: 39184500

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Project description:Photocatalyst is the core of photocatalysis and directly determines photocatalytic performance. However, low quantum efficiency and low utilization of solar energy are important technical problems in the application of photocatalysis. In this work, a series of polyoxometalates (POMs) [H3PW12O40] (PW12)-doped titanium dioxide (TiO2) nanofibers modified with various amount of silver (Ag) nanoparticles (NPs) were prepared by utilizing electrospinning/photoreduction strategy, and were labelled as x wt% Ag/PW12/TiO2 (abbr. x% Ag/PT, x = 5, 10, and 15, respectively). The as-prepared materials were characterized with a series of techniques and exhibited remarkable catalytic activities for visible-light degradation tetracycline (TC), enrofloxacin (ENR), and methyl orange (MO). Particularly, the 10% Ag/PT catalyst with a specific surface area of 155.09 m2/g and an average aperture of 4.61 nm possessed the optimal photodegradation performance, with efficiencies reaching 78.19% for TC, 93.65% for ENR, and 99.29% for MO, which were significantly higher than those of PW12-free Ag/TiO2 and PT nanofibers. Additionally, various parameters (the pH of the solution, catalyst usage, and TC concentration) influencing the degradation process were investigated in detail. The optimal conditions are as follows: catalyst usage: 20 mg; TC: 20 mL of 20 ppm; pH = 7. Furthermore, the photodegradation intermediates and pathways were demonstrated by HPLC-MS measurement. We also investigated the toxicity of products generated during TC removal by employing quantitative structure-activity relationship (QSAR) prediction through a toxicity estimation software tool (T.E.S.T. Version 5.1.2.). The mechanism study showed that the doping of PW12 and the modification of Ag NPs on TiO2 broadened the visible-light absorption, accelerating the effective separation of photogenerated carriers, therefore resulting in an enhanced photocatalytic performance. The research provided some new thoughts for exploiting efficient and durable photocatalysts for environmental remediation.

Dataset Information

Boosted Photocatalytic Activities of Ag₂CrO₄ through Eu³⁺-Doping Process.

Publications

Boosted Photocatalytic Activities of Ag<sub>2</sub>CrO<sub>4</sub> through Eu<sup>3+</sup>-Doping Process.

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