Environmental remediation properties of Bi2WO6 hierarchical nanostructure: A joint experimental and theoretical investigation

Chaves, Marisa de Jesus Silva; Lima, Gênesis de Oliveira; Assis, Marcelo; Mendonça, Cáritas de Jesus Silva; Pinatti, Ivo M.; Gouveia, Amanda Fernandes; Rosa, Ieda L. V.; Longo, Elson; Almeida, M. A. P.; Franco, Teresa Cristina Rodrigues dos Santos

doi:10.1016/j.jssc.2019.03.031

Cited by 23 publications

(2 citation statements)

References 35 publications

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“…Figure d shows the results of scavenger tests performed for the CeO 2 NCs used to unveil the RhB photodegradation process. To investigate its mechanism selective scavengers of different reactive species e – (silver nitrate), h + (ammonium oxalate), ·OH ( tert -butyl alcohol), and ·O 2 – ( p -benzoquinone) were added to the RhB solutions. − While no significant changes were observed on the samples synthesized in ethanol since their photocatalytic efficiency is very close to actual photolysis, on the sample synthesized in acetone, a reduction for all scavengers can be observed, especially the ·O 2 – radical. Hence, we know that, in the degradation process, all reactive species participate in breaking down the RhB molecule, and there is a greater contribution of ·O 2 – radicals.…”

Section: Resultsmentioning

confidence: 99%

The Relationship between Photoluminescence Emissions and Photocatalytic Activity of CeO₂ Nanocrystals

et al. 2023

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In this work, we focus on understanding the morphology and photocatalytic properties of CeO2 nanocrystals (NCs) synthesized via a microwave-assisted solvothermal method using acetone and ethanol as solvents. Wulff constructions reveal a complete map of available morphologies and a theoretical-experimental match with octahedral nanoparticles obtained through synthesis using ethanol as solvent. NCs synthesized in acetone show a greater contribution of emission peaks in the blue region (∼450 nm), which may be associated with higher Ce3+ concentration, originating shallow-level defects within the CeO2 lattice while for the samples synthesized in ethanol a strong orange-red emission (∼595 nm) suggests that oxygen vacancies may originate from deep-level defects within the optical bandgap region. The superior photocatalytic response of CeO2 synthesized in acetone compared to that of CeO2 synthesized in ethanol may be associated with an increase in long-/short-range disorder within the CeO2 structure, causing the E gap value to decrease, facilitating light absorption. Furthermore, surface (100) stabilization in samples synthesized in ethanol may be related to low photocatalytic activity. Photocatalytic degradation was facilitated by the generation of ·OH and ·O2 – radicals as corroborated by the trapping experiment. The mechanism of enhanced photocatalytic activity has been proposed suggesting that samples synthesized in acetone tend to have lower e′h· pair recombination, which is reflected in their higher photocatalytic response.

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Section: Resultsmentioning

confidence: 99%

The Relationship between Photoluminescence Emissions and Photocatalytic Activity of CeO₂ Nanocrystals

et al. 2023

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“…Within this category, Janus structures, heterojunctions, and ferroelectric materials stand out due to their distinctive capabilities in enhancing photocatalytic performance. [13][14][15][16][17][18] Monolayer Janus structures, with their asymmetrical composition, offer a unique platform for directional (out-of-plane) charge separation, pushing the electrons and holes on different surfaces for redox reactions. Bilayer heterojunctions, by stacking two different semiconducting materials, create interfaces that facilitate effective charge carrier dynamics, leading to effective separation of electrons and holes within two materials.…”

Section: Introductionmentioning

confidence: 99%

Polar materials for photocatalytic applications: A critical review

Liu,

Zhang,

Wang

et al. 2024

Interdisciplinary Materials

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The critical challenges of the energy crisis and environmental degradation promote innovative approaches for energy conversion. Semiconductor‐based photocatalytic technology, which transforms solar energy into chemical energy, emerges as a promising solution. However, the practical application of this technology faces several challenges, such as the rapid recombination of photogenerated electrons and holes, significantly limiting photocatalytic efficiency. In this review, we provide a detailed discussion, an insightful perspective, and a critical evaluation of recent advances, challenges, and opportunities in the field of photocatalysis using polar materials. We present a comprehensive examination of the photocatalytic mechanisms, activity, and diverse applications of photocatalysts based on polar materials. We also briefly discuss the engineering design of polar photocatalysis in experiments and its scalability in the industry. This review outlines future trends and potential breakthroughs in the photocatalytic field using polar materials, projecting their transformative impact on environmental chemistry and energy engineering.

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Introducing Structural Diversity: Fe₂(MoO₄)₃ Immobilized in Chitosan Films as an Efficient Catalyst for the Selective Oxidation of Sulfides to Sulfones

et al. 2023

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This work reports how the immobilization of Fe 2 (MoO4) 3 in chitosan films affects the oxidation reaction of sulfide derivatives to sulfates in the dark, resulting in good yields and excellent selectivity. As demonstrated, a variety of substituted sulfides were tolerated even in the presence of oxidativesensitive functional groups, leading to a regioselective application of the catalyst under mild reaction conditions and guaranteeing its reuse for at least 6 cycles without losing its catalytic performance. Specifically, films containing 1 mg of Fe 2 (MoO 4 ) 3 per ml of chitosan showed a yield and selectivity of 99 %. The key success of the selective oxidation was associated with the presence of the hydroxyl radical, •OH, and the Fe 3 + / Fe 2 + Fenton-like process. As a proof of concept, the selective oxidation of sulfides to the corresponding sulfones was performed to demonstrate the synergistic effect between Fe 2 (MoO 4 ) 3 and chitosan. This work offers a design strategy for efficient catalysts that may extend to other semiconductors and oxidation processes.

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Environmental remediation properties of Bi2WO6 hierarchical nanostructure: A joint experimental and theoretical investigation

Cited by 23 publications

References 35 publications

The Relationship between Photoluminescence Emissions and Photocatalytic Activity of CeO₂ Nanocrystals

The Relationship between Photoluminescence Emissions and Photocatalytic Activity of CeO₂ Nanocrystals

Polar materials for photocatalytic applications: A critical review

Introducing Structural Diversity: Fe₂(MoO₄)₃ Immobilized in Chitosan Films as an Efficient Catalyst for the Selective Oxidation of Sulfides to Sulfones

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Environmental remediation properties of Bi2WO6 hierarchical nanostructure: A joint experimental and theoretical investigation

Cited by 23 publications

References 35 publications

The Relationship between Photoluminescence Emissions and Photocatalytic Activity of CeO2 Nanocrystals

The Relationship between Photoluminescence Emissions and Photocatalytic Activity of CeO2 Nanocrystals

Polar materials for photocatalytic applications: A critical review

Introducing Structural Diversity: Fe2(MoO4)3 Immobilized in Chitosan Films as an Efficient Catalyst for the Selective Oxidation of Sulfides to Sulfones

Contact Info

Product

Resources

About

The Relationship between Photoluminescence Emissions and Photocatalytic Activity of CeO₂ Nanocrystals

The Relationship between Photoluminescence Emissions and Photocatalytic Activity of CeO₂ Nanocrystals

Introducing Structural Diversity: Fe₂(MoO₄)₃ Immobilized in Chitosan Films as an Efficient Catalyst for the Selective Oxidation of Sulfides to Sulfones