Stannates, titanates and tantalates modified with carbon and graphene quantum dots for enhancement of visible-light photocatalytic activity

Paszkiewicz-Gawron, Marta; Kowalska, Ewa; Endo‐Kimura, Maya; Zwara, Julia; Pancielejko, Anna; Wang, Kunlei; Lisowski, Wojciech; Łuczak, Justyna; Zaleska-Medynska, Adriana; Grabowska-Musiał, Ewelina

doi:10.1016/j.apsusc.2020.148425

Cited by 21 publications

(12 citation statements)

References 93 publications

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“…Tsega et al have reported the emission spectrum which is quite similar in pattern to the one reported here but the intensity of blue band was overwhelmingly large when compared to other bands in their samples . The emission spectrum reported here is quite similar to the one reported for SrSnO 3 . The blue band is of the same intensity as the other bands, in our case.…”

Section: Results and Discussionsupporting

confidence: 89%

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Light Harvesting from Oxygen Vacancies and A- and B-Site Dopants in CaSnO₃ Perovskite through Efficient Photon Utilization and Local Site Engineering

Gupta

Modak

Das

et al. 2021

ACS Appl. Electron. Mater.

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Significant research has been carried out in ABO 3 perovskites during last decades in tailoring their luminescence properties for advanced optoelectronics. However, research related to exploring contribution of defects, both cation and anion vacancies in photoluminescence for multicolor photon emission has never been explored. Here, in this work, we have harnessed the full gamut of light emission from violet-blue to deep red originating from oxygen vacancies (OVs) in undoped CaSnO 3 (CSO) and Eu@CaO 8 and Eu@SnO 6 sites in the doped CaSnO 3 :Eu 3+ (CSOE) perovskite. Any contribution of Sn 2+ and Eu 2+ , respectively, in photoluminescence of CSO and CSOE has been completely ruled out through Xray absorption near-edge structure. Synchrotron radiation-based extended Xray absorption fine structure and positron annihilation lifetime spectroscopy showed simultaneous distribution of Eu 3+ ions at both asymmetric CaO 8 and symmetric SnO 6 sites owing to a very high negative formation energy value of −6.56 eV for the same. By efficient photon utilization arising from two different charge transfer bands, axial oxygen of SnO 6 octahedra O1 → Eu 3+ CTB (∼250 nm) preferentially transfers energy to Eu@CaO 8 leading to intense electric dipole transition, whereas equatorial oxygen of SnO 6 octahedra O2 → Eu 3+ CTB (∼300 nm) excites Eu@SnO 6 leading to intense magnetic dipole transition. This analogy is confirmed by DFT, wherein it was found that the calculated energy difference between the valence band maxima and conduction band minima is 4.77 eV (∼250 nm) and 4.3 eV (∼300 nm) for Eu@Ca and Eu@Sn sites, respectively. This concept of site-selective excitation and local site engineering can be applied to a variety of optical materials, which provides a unique strategy for tuning other properties of multifunctional crystals that are highly sensitive to the dopant's local environment.

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Section: Results and Discussionsupporting

confidence: 89%

“…59 The emission spectrum reported here is quite similar to the one reported for SrSnO 3 . 60 The blue band is of the same intensity as the other bands, in our case.…”

Section: Resultssupporting

confidence: 68%

Light Harvesting from Oxygen Vacancies and A- and B-Site Dopants in CaSnO₃ Perovskite through Efficient Photon Utilization and Local Site Engineering

Gupta

Modak

Das

et al. 2021

ACS Appl. Electron. Mater.

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“…Previous studies have pointed out that carbon quantum dots (CQDs)-modified semiconductors are promising photocatalysts and can be used as sustainable environmental pollutant-purification materials. Paszkiewicz-Gawron M. et al [55] synthesized spherical, Previous studies have pointed out that carbon quantum dots (CQDs)-modified semiconductors are promising photocatalysts and can be used as sustainable environmental pollutant-purification materials. Paszkiewicz-Gawron M. et al [55] synthesized spherical, rod-shaped, and faceted nanomaterials with a wide energy band perovskite doped by CQDs, graphene quantum dots, Er: SrTiO 3 (titanate), SrSnO 3 (stannate), and AgTaO 3 (tantalate) via thermal the solvent method, which were used to study the degradation of toluene.…”

Section: C-dopedmentioning

confidence: 99%

Nano Metal-Containing Photocatalysts for the Removal of Volatile Organic Compounds: Doping, Performance, and Mechanisms

et al. 2022

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Volatile organic compounds (VOCs) in indoor air are considered a major threat to human health and environmental safety. The development of applicable technologies for the removal of VOCs is urgently needed. Nowadays, photocatalytic oxidation (PCO) based on metal-containing photocatalysts has been regarded as a promising method. However, unmodified photocatalysts are generally limited in applications because of the narrow light response range and high recombination rate of photo-generated carriers. As a result, nano metal-containing photocatalysts doped with elements or other materials have attracted much attention from researchers and has developed over the past few decades. In addition, different doping types cause different levels of catalyst performance, and the mechanism for performance improving is also different. However, there are few reviews focusing on this aspect, which is really important for catalyst design and application. This work aims to give a comprehensive overview of nano metal-containing photocatalysts with different doping types for the removal of VOCs in an indoor environment. First, the undoped photocatalysts and the basic mechanism of PCO is introduced. Then, the application of metal doping, non-metal doping, co-doping, and other material doping in synthetic metal-containing photocatalysts are discussed and compared, respectively, and the synthesis methods, removal efficiency, and mechanisms are further investigated. Finally, a development trend for using nano metal-containing photocatalysts for the removal of VOCs in the future is proposed. This work provides a meaningful reference for selecting effective strategies to develop novel photocatalysts for the removal of VOCs in the future.

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“…Jiang et al have revealed that when Cu/ZnO@rGO reacts with bacterial cells, the composite induces the electron donor on the cell surface to react with oxygen molecules to generate and accumulate • O 2 − , causing the oxidative stress (e.g., membrane damage and protein leakage), as shown in Figure 14 [123]. The modification of titania with rGO improves the photocatalytic efficiency due to enhanced charge separation, hindered charge carriers' recombination and vis absorbance (due to the mid-gap states above the valence band of titania) [130,131]. Interestingly, Cruz-Ortiz et al have revealed the dominant ROS formed on TiO 2 -rGO for the bactericidal effect, i.e., H 2 O 2 , • OH, and singlet oxygen under UV-vis, and only singlet oxygen under vis [126].…”

Section: Antimicrobial Properties Of Graphene-based Composite Photocatalystsmentioning

confidence: 99%

Novel Structures and Applications of Graphene-Based Semiconductor Photocatalysts: Faceted Particles, Photonic Crystals, Antimicrobial and Magnetic Properties

et al. 2021

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Graphene, graphene oxide, reduced graphene oxide and their composites with various compounds/materials have high potential for substantial impact as cheap photocatalysts, which is essential to meet the demands of global activity, offering the advantage of utilizing “green” solar energy. Accordingly, graphene-based materials might help to reduce reliance on fossil fuel supplies and facile remediation routes to achieve clean environment and pure water. This review presents recent developments of graphene-based semiconductor photocatalysts, including novel composites with faceted particles, photonic crystals, and nanotubes/nanowires, where the enhancement of activity mechanism is associated with a synergistic effect resulting from the presence of graphene structure. Moreover, antimicrobial potential (highly needed these days), and facile recovery/reuse of photocatalysts by magnetic field have been addresses as very important issue for future commercialization. It is believed that graphene materials should be available soon in the market, especially because of constantly decreasing prices of graphene, vis response, excellent charge transfer ability, and thus high and broad photocatalytic activity against both organic pollutants and microorganisms.

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Stannates, titanates and tantalates modified with carbon and graphene quantum dots for enhancement of visible-light photocatalytic activity

Cited by 21 publications

References 93 publications

Light Harvesting from Oxygen Vacancies and A- and B-Site Dopants in CaSnO₃ Perovskite through Efficient Photon Utilization and Local Site Engineering

Light Harvesting from Oxygen Vacancies and A- and B-Site Dopants in CaSnO₃ Perovskite through Efficient Photon Utilization and Local Site Engineering

Nano Metal-Containing Photocatalysts for the Removal of Volatile Organic Compounds: Doping, Performance, and Mechanisms

Novel Structures and Applications of Graphene-Based Semiconductor Photocatalysts: Faceted Particles, Photonic Crystals, Antimicrobial and Magnetic Properties

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Stannates, titanates and tantalates modified with carbon and graphene quantum dots for enhancement of visible-light photocatalytic activity

Cited by 21 publications

References 93 publications

Light Harvesting from Oxygen Vacancies and A- and B-Site Dopants in CaSnO3 Perovskite through Efficient Photon Utilization and Local Site Engineering

Light Harvesting from Oxygen Vacancies and A- and B-Site Dopants in CaSnO3 Perovskite through Efficient Photon Utilization and Local Site Engineering

Nano Metal-Containing Photocatalysts for the Removal of Volatile Organic Compounds: Doping, Performance, and Mechanisms

Novel Structures and Applications of Graphene-Based Semiconductor Photocatalysts: Faceted Particles, Photonic Crystals, Antimicrobial and Magnetic Properties

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Light Harvesting from Oxygen Vacancies and A- and B-Site Dopants in CaSnO₃ Perovskite through Efficient Photon Utilization and Local Site Engineering

Light Harvesting from Oxygen Vacancies and A- and B-Site Dopants in CaSnO₃ Perovskite through Efficient Photon Utilization and Local Site Engineering