Investigation on the photocatalytic performance of Ag4P2O7 microcrystals for the degradation of organic pollutants

Pereira, Wyllamanney da Silva; Gozzo, Cipriano B.; Longo, E.; Leite, E. R.; Sczancoski, J. C.

doi:10.1016/j.apsusc.2019.07.148

Cited by 19 publications

(12 citation statements)

References 74 publications

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“…For the used BFO/APO composite, diffraction peaks at 2θ value of 32.21, 38.20, 46.31° could be assigned to the (1 1 1 2), (2 2 2), (2 2 1 2) crystal plane of Ag 4 P 2 O 7 (PDF#37‐0187), respectively. Because of the distortions on P−O bonds of P 2 O 7 4− , Ag 4 P 2 O 7 has a wide bandgap (3.1–3.3 eV) and fails to be excited by visible light according to previous literature [28,42] . In this way, the partial phase transition between Ag 3 PO 4 and Ag 4 P 2 O 7 occurred during the first cycle and the comparison of BFO and Ag 4 P 2 O 7 would reduce the photo‐response to the visible‐light source.…”

Section: Resultsmentioning

confidence: 95%

Preparation and Characterization of Bi₂Fe₄O₉/Ag₃PO₄ Composite Photocatalyst for Degradation of EE2

Liu

et al. 2021

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Bi2Fe4O9/Ag3PO4 (BFO/APO) composites as a kind of new material were successfully prepared through the hydrothermal‐precipitation method and employed for degrading 17α‐ethynyl estradiol (EE2). Upon illumination, the total removal efficiency of EE2 reached 98.68 % and the reaction rate constant K value of 1 : 6 BFO/APO (0.05111 min−1) was respectively 7, 5 and 55 times that of BFO (0.01074 min−1), APO (0.007260 min−1) and conventional photocatalysis (9.38×10−4 min−1). The combination with BFO also effectively prevented the occurrence of APO photo corrosion reactions. According to the capture experiments, .O2−, holes and .OH are considered major or minor important respectively to the photocatalytic reaction. This work provides a new insight in construct the direct Z‐scheme photocatalyst for EE2 degradation.

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Section: Resultsmentioning

confidence: 95%

Preparation and Characterization of Bi₂Fe₄O₉/Ag₃PO₄ Composite Photocatalyst for Degradation of EE2

Liu

et al. 2021

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“…Cubic Ag 3 PO 4 was identified (COD 00-101-0324) in all cases: the reflections of the Ag 3 PO 4 were located at 2θ° ≈ 21.1°, ≈29.8°, ≈33.3°, ≈36.7°, ≈42.6°, ≈47.9°, ≈52.8°, ≈55.2°, and ≈57.3°, which were assigned to (110), (200), (210), (211), (220), (310), (222), (320), and (321) crystallographic planes ( Figure 2 a). Additional reflections were also observed in the Ag 3 PO 4 _NaH 2 PO 4 sample series located at 2θ° ≈ 27.0°, ≈30.6° and ≈32.1° ( Figure 2 a), which could be associated with the typical reflections of Ag 4 P 2 O 7 [ 20 ]. These observations are consistent with the presumed mechanism ( Figure 1 ).…”

Section: Resultsmentioning

confidence: 99%

Rapid Synthesis Method of Ag3PO4 as Reusable Photocatalytically Active Semiconductor

et al. 2022

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The widespread use of Ag3PO4 is not surprising when considering its higher photostability compared to other silver-based materials. The present work deals with the facile precipitation method of silver phosphate. The effects of four different phosphate sources (H3PO4, NaH2PO4, Na2HPO4, Na3PO4·12 H2O) and two different initial concentrations (0.1 M and 0.2 M) were investigated. As the basicity of different phosphate sources influences the purity of Ag3PO4, different products were obtained. Using H3PO4 did not lead to the formation of Ag3PO4, while applying NaH2PO4 resulted in Ag3PO4 and a low amount of pyrophosphate. The morphological and structural properties of the obtained samples were studied by X-ray diffractometry, diffuse reflectance spectroscopy, scanning electron microscopy, infrared spectroscopy, and X-ray photoelectron spectroscopy. The photocatalytic activity of the materials and the corresponding reaction kinetics were evaluated by the degradation of methyl orange (MO) under visible light. Their stability was investigated by reusability tests, photoluminescence measurements, and the recharacterization after degradation. The effect of as-deposited Ag nanoparticles was also highlighted on the photostability and the reusability of Ag3PO4. Although the deposited Ag nanoparticles suppressed the formation of holes and reduced the degradation of methyl orange, they did not reduce the performance of the photocatalyst.

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“…Much worse stability was observed for pristine Ag 3 PO 4 , where a decrease in activity from 50% to ca. 5% was noticed (Photocorrosion of Ag 3 PO 4 and Ag 4 P 2 O 7 is a well-known problem [134,135]). As another example of BaFe 12 O 19 ferrite combined with an Ag-based photocatalyst, Xie et al proposed a BaFe 12 O 19 /AgBr composite for visible-light degradation of 2-mercaptobenzothiazole-MBT (λ ≥ 420 nm) [136].…”

Section: Hexaferrites Compositesmentioning

confidence: 99%

Application of Spinel and Hexagonal Ferrites in Heterogeneous Photocatalysis

et al. 2021

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Semiconducting materials display unique features that enable their use in a variety of applications, including self-cleaning surfaces, water purification systems, hydrogen generation, solar energy conversion, etc. However, one of the major issues is separation of the used materials from the process suspension. Therefore, chemical compounds with magnetic properties have been proposed as crucial components of photocatalytic composites, facilitating separation and recovery of photocatalysts under magnetic field conditions. This review paper presents the current state of knowledge on the application of spinel and hexagonal ferrites in heterogeneous photocatalysis. The first part focuses on the characterization of magnetic (nano)particles. The next section presents the literature findings on the single-phase magnetic photocatalyst. Finally, the current state of scientific knowledge on the wide variety of magnetic-photocatalytic composites is presented. A key aim of this review is to indicate that spinel and hexagonal ferrites are considered as an important element of heterogeneous photocatalytic systems and are responsible for the effective recycling of the photocatalytic materials.

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Investigation on the photocatalytic performance of Ag4P2O7 microcrystals for the degradation of organic pollutants

Cited by 19 publications

References 74 publications

Preparation and Characterization of Bi₂Fe₄O₉/Ag₃PO₄ Composite Photocatalyst for Degradation of EE2

Preparation and Characterization of Bi₂Fe₄O₉/Ag₃PO₄ Composite Photocatalyst for Degradation of EE2

Rapid Synthesis Method of Ag3PO4 as Reusable Photocatalytically Active Semiconductor

Application of Spinel and Hexagonal Ferrites in Heterogeneous Photocatalysis

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Investigation on the photocatalytic performance of Ag4P2O7 microcrystals for the degradation of organic pollutants

Cited by 19 publications

References 74 publications

Preparation and Characterization of Bi2Fe4O9/Ag3PO4 Composite Photocatalyst for Degradation of EE2

Preparation and Characterization of Bi2Fe4O9/Ag3PO4 Composite Photocatalyst for Degradation of EE2

Rapid Synthesis Method of Ag3PO4 as Reusable Photocatalytically Active Semiconductor

Application of Spinel and Hexagonal Ferrites in Heterogeneous Photocatalysis

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Preparation and Characterization of Bi₂Fe₄O₉/Ag₃PO₄ Composite Photocatalyst for Degradation of EE2

Preparation and Characterization of Bi₂Fe₄O₉/Ag₃PO₄ Composite Photocatalyst for Degradation of EE2