Novel formation of Bi@BiFe-glycolate hollow spheres and their conversion into Bi2O3/BiFeO3 composite hollow spheres with enhanced activity and durability in visible photocatalysis

Xu, Yang; Meng, Junsheng; Wang, Yu; Meng, Qingqiang; Hu, Yong; Di, Andi; Wu, Yuehan; Chen, Gang

doi:10.1039/c8nj00949j

Cited by 13 publications

(3 citation statements)

References 40 publications

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“…The synthesized spheres are higher catalytically active than corresponding BiFeO

nanoparticles. The formation of Bi

/BiFeO

composite hollow spheres by annealing Bi@BiFe-glycolate precursors was reported by Chen and co-workers [ 35 ]. The obtained hollow spheres exhibited enhanced photocatalytic activity and stability under visible-light irradiation due to their special morphology.…”

Section: Introductionmentioning

confidence: 74%

Hydrothermal Synthesis of Bismuth Ferrite Hollow Spheres with Enhanced Visible-Light Photocatalytic Activity

et al. 2023

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In recent years, semiconductor hollow spheres have gained much attention due to their unique combination of morphological, chemical, and physico-chemical properties. In this work, we report for the first time the synthesis of BiFeO3 hollow spheres by a facile hydrothermal treatment method. The mechanism of formation of pure phase BiFeO3 hollow spheres is investigated systematically by variation of synthetic parameters such as temperature and time, ratio and amount of precursors, pressure, and calcination procedures. The samples were characterized by X-ray powder diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, and UV-vis diffuse reflectance spectroscopy. We observe that the purity and morphology of the synthesized materials are very sensitive to synthesis parameters. In general, the chemically and morphologically very robust hollow spheres have diameters in the range of 200 nm to 2 μm and a wall thickness of 50–200 nm. The synthesized BiFeO3 hollow spheres were applied as catalysts in the photodegradation of the model pollutant Rhodamine B under visible-light irradiation. Notably, the photocatalyst demonstrated exceptionally high removal efficiencies leading to complete degradation of the dye in less than 150 min at neutral pH. The superior efficiencies of the synthesized material are attributed to the unique features of hollow spheres. The active species in the photocatalytic process have been identified by trapping experiments.

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“…The synthesized spheres are higher catalytically active than corresponding BiFeO

nanoparticles. The formation of Bi

/BiFeO

Section: Introductionmentioning

confidence: 74%

Hydrothermal Synthesis of Bismuth Ferrite Hollow Spheres with Enhanced Visible-Light Photocatalytic Activity

et al. 2023

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“…The fact that SrTiO 3 /Ag/rGO/SPCE exhibits the shortest semicircle when compared to other modified electrodes suggests that the integration of rGO and Ag can alter the electrical properties of a SrTiO 3 . The smaller R ct values were observed for the SrTiO 3 /Ag/rGO composite because of the diffusion control reaction occurred at the electrode–electrolyte interface, transfer efficiency, electronic conductivity, and large surface area. − Therefore, the SrTiO 3 /Ag/rGO composite provides excellent electrochemical activity compared to other samples.…”

Section: Results and Discussionmentioning

confidence: 99%

Electrochemical Detection of 4-Nitrophenol Using a Novel SrTiO₃/Ag/rGO Composite

M. Visagamani,

Harb,

Kaviyarasu

et al. 2023

ACS Omega

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In this study, an eco-friendly strategy was used to prepare a novel SrTiO 3 / Ag/rGO composite. A SrTiO 3 /Ag/rGO composite-modified screen-printed carbon electrode (SPCE) was applied for the electrochemical detection of 4-nitrophenol. A simple ultrasonic method with an ultrasonic frequency of 20 kHz was used for the synthesis of SrTiO 3 /Ag/rGO composite material. The obtained SrTiO 3 /Ag/rGO composite was characterized by X-ray diffraction, Fourier transform infrared, Raman spectroscopy, field emission electron microscopy, and UV−visible spectroscopy. Electrochemical impedance spectroscopy was used to determine the electrical conductivity of the SrTiO 3 /Ag/rGO composite. The electrochemical properties of the modified electrode were studied using cyclic voltammetry as well as linear sweep voltammetry techniques. In comparison to SrTiO 3 /SPCE, SrTiO 3 /Ag/SPCE, and SrTiO 3 /rGO/SPCE electrodes, SrTiO 3 /Ag/rGO/SPCE demonstrates a considerable increase in 4-nitrophenol redox peak current. At optimum conditions, a large linear response range of 0.1−1000 M, with a relatively low limit of detection (0.03 M), outperforms the previously published modified electrode for 4-nitrophenol. Moreover, the SrTiO 3 /Ag/rGO/SPCE electrode-based 4-nitrophenol sensor is distinguished by good selectivity, high stability, and repeatability. Furthermore, SrTiO 3 /Ag/rGO/SPCE contributed to the detection of 4-nitrophenol in river water and drinking water with the recovery range from 97.5 to 98.7%. The experimental finding was supported by density functional theory calculation.

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“…18,19 To the best of our knowledge, the photocatalytic behavior of the Bi 2 O 3 /BiFeO 3 heterostructure has been studied a few times in literature. In these very recent publications, 22,23 authors prepared this heterostructure using the costly nitrates precursors and the conventional sol−gel or hydrothermal methods. In this study, we provide, for the first time, the traditional melt technique for combining the highly photoactive metastable βand γ-Bi 2 O 3 phases with BiFeO 3 in one glass-ceramic material.…”

Section: ■ Introductionmentioning

confidence: 99%

Bi₂O₃–BiFeO₃ Glass-Ceramic: Controllable β-/γ-Bi₂O₃ Transformation and Application as Magnetic Solar-Driven Photocatalyst for Water Decontamination

et al. 2020

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Glass and glass-ceramic materials containing photoactive and magnetic crystalline phases were prepared from Fe2O3 and Bi2O3 using the conventional melt method. All samples were characterized in terms of formed phases, morphological analyses, optical properties, and magnetic properties. Formation of the photoactive tetragonal β- and body-centered cubic γ-Bi2O3 phases along with the magnetic BiFeO3 and Fe3O4 phases was revealed. However, the crystalline structure relied on the composition and the applied heat-treatment time. β-/γ-Bi2O3 transformation could be controlled by the heat-treatment time. The samples exhibited variable magnetic properties depending on their composition. All of the samples showed excellent absorbance in visible light with an optical band gap of 1.90–2.22 eV, making them ideal for solar-light-driven photocatalysis. The best performance was recorded for the sample containing equal amounts of Fe2O3 and Bi2O3 due to the formation of γ-Bi2O3/BiFeO3 heterojunction in this sample.

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Novel formation of Bi@BiFe-glycolate hollow spheres and their conversion into Bi₂O₃/BiFeO₃ composite hollow spheres with enhanced activity and durability in visible photocatalysis

Abstract: Novel passion fruit-like Bi@BiFe-glycolate hollow spheres are synthesized and explained by an interesting mechanism of “spit and swallow” process.

Cited by 13 publications

References 40 publications

Hydrothermal Synthesis of Bismuth Ferrite Hollow Spheres with Enhanced Visible-Light Photocatalytic Activity

Hydrothermal Synthesis of Bismuth Ferrite Hollow Spheres with Enhanced Visible-Light Photocatalytic Activity

Electrochemical Detection of 4-Nitrophenol Using a Novel SrTiO₃/Ag/rGO Composite

Bi₂O₃–BiFeO₃ Glass-Ceramic: Controllable β-/γ-Bi₂O₃ Transformation and Application as Magnetic Solar-Driven Photocatalyst for Water Decontamination

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Novel formation of Bi@BiFe-glycolate hollow spheres and their conversion into Bi2O3/BiFeO3 composite hollow spheres with enhanced activity and durability in visible photocatalysis

Abstract: Novel passion fruit-like Bi@BiFe-glycolate hollow spheres are synthesized and explained by an interesting mechanism of “spit and swallow” process.

Cited by 13 publications

References 40 publications

Hydrothermal Synthesis of Bismuth Ferrite Hollow Spheres with Enhanced Visible-Light Photocatalytic Activity

Hydrothermal Synthesis of Bismuth Ferrite Hollow Spheres with Enhanced Visible-Light Photocatalytic Activity

Electrochemical Detection of 4-Nitrophenol Using a Novel SrTiO3/Ag/rGO Composite

Bi2O3–BiFeO3 Glass-Ceramic: Controllable β-/γ-Bi2O3 Transformation and Application as Magnetic Solar-Driven Photocatalyst for Water Decontamination

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Product

Resources

About

Novel formation of Bi@BiFe-glycolate hollow spheres and their conversion into Bi₂O₃/BiFeO₃ composite hollow spheres with enhanced activity and durability in visible photocatalysis

Electrochemical Detection of 4-Nitrophenol Using a Novel SrTiO₃/Ag/rGO Composite

Bi₂O₃–BiFeO₃ Glass-Ceramic: Controllable β-/γ-Bi₂O₃ Transformation and Application as Magnetic Solar-Driven Photocatalyst for Water Decontamination