Fibrous red phosphorus as a non-metallic photocatalyst for the effective reduction of Cr(VI) under direct sunlight

Athira, T.K.; Roshith, M.; Babu, T G Satheesh; Kumar, Darbha V. Ravi

doi:10.1016/j.matlet.2020.128750

Cited by 16 publications

(13 citation statements)

References 13 publications

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“…The sufficiently negative potential of the CB electrons in BOC (−0.77 V vs. NHE) suggests that they can reduce Cr( vi ) into Cr( iii ) ( E θ (Cr 2 O 7 2− /Cr 3+ ) = +1.33 V vs. NHE 70 ). The CB electrons in BOC can also react with the adsorbed O 2 on the photocatalyst surface to produce ˙O 2 − radicals ( E θ (O 2 /˙O 2 − ) = −0.13 V vs. NHE 66 ).…”

Section: Resultsmentioning

confidence: 99%

Template-free synthesis of Bi₂O₂CO₃ hierarchical nanotubes self-assembled from ordered nanoplates for promising photocatalytic applications

Sun

Tang

et al. 2022

Phys. Chem. Chem. Phys.

105

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Section: Resultsmentioning

confidence: 99%

Template-free synthesis of Bi₂O₂CO₃ hierarchical nanotubes self-assembled from ordered nanoplates for promising photocatalytic applications

Sun

Tang

et al. 2022

Phys. Chem. Chem. Phys.

105

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“…Fibrous RP composed of a parallel arrangement of pentagonal tubes with P 8 and P 9 structural units were prepared by a solid-state reaction route mediated by I 2 . 336 Intertubular and intratubular vibrations of fibrous RP were observed through the existence of low frequency (below 175 cm −1 ) and high frequency (above 175 cm −1 ) XRD peaks, respectively. The strengthened optical absorption properties of fibrous RP within the solar spectrum were also consolidated by the UV−visible DRS analysis which depicted a strong absorption edge at ∼670 nm.…”

Section: Photocatalytic Applications For Pollutants Degradationmentioning

confidence: 99%

“…Moreover, in an acidic environment, the protonation of photocatalytic surface aided the powerful electrostatic interaction between the negatively charged hydrogen chromate ion (HCrO 4 − ) and protonated surface of the fibrous RP, which favored the photocatalytic reduction of Cr(VI) under direct solar light. 336 Bi-based semiconductors, namely BiOX (where X = I, Br, and Cl), BiVO 4 and Bi 2 WO 6 are eminent members of the photocatalysis family due to their enticing semiconducting characteristics such as suitable Fermi energy levels, suppressed electronic mass impact and appropriate electronic band structure. 337 Among the Bi-based materials, bismuth(III) oxide (Bi 2 O 3 ) with a band gap ranging between 2.60 and 2.90 eV emerged as the photocatalyst of choice owing to its excellent dielectric permittivity, superlative refractive index and notable photoconductivity.…”

Section: Photocatalytic Applications For Pollutants Degradationmentioning

confidence: 99%

Red Phosphorus: An Up-and-Coming Photocatalyst on the Horizon for Sustainable Energy Development and Environmental Remediation

Fung

Tan

et al. 2021

Chem. Rev.

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Photocatalysis is a perennial solution that promises to resolve deep-rooted challenges related to environmental pollution and energy deficit through harvesting the inexhaustible and renewable solar energy. To date, a cornucopia of photocatalytic materials has been investigated with the research wave presently steered by the development of novel, affordable, and effective metal-free semiconductors with fascinating physicochemical and semiconducting characteristics. Coincidentally, the recently emerged red phosphorus (RP) semiconductor finds itself fitting perfectly into this category ascribed to its earth abundant, low-cost, and metal-free nature. More notably, the renowned red allotrope of the phosphorus family is spectacularly bestowed with strengthened optical absorption features, propitious electronic band configuration, and ease of functionalization and modification as well as high stability. Comprehensively detailing RP’s roles and implications in photocatalysis, this review article will first include information on different RP allotropes and their chemical structures, followed by the meticulous scrutiny of their physicochemical and semiconducting properties such as electronic band structure, optical absorption features, and charge carrier dynamics. Besides that, state-of-the-art synthesis strategies for developing various RP allotropes and RP-based photocatalytic systems will also be outlined. In addition, modification or functionalization of RP with other semiconductors for promoting effective photocatalytic applications will be discussed to assess its versatility and feasibility as a high-performing photocatalytic system. Lastly, the challenges facing RP photocatalysts and future research directions will be included to propel the feasible development of RP-based systems with considerably augmented photocatalytic efficiency. This review article aspires to facilitate the rational development of multifunctional RP-based photocatalytic systems by widening the cognizance of rational engineering as well as to fine-tune the electronic, optical, and charge carrier properties of RP.

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“…Biofriendly metal-free photocatalysts are expected to replace metal photocatalysts to address the unsustainability of BAHs ( Athira et al, 2021 ). As a potential representative, carbon nitride (CN x ) has attracted widespread attention with its advantages of medium bandgap, non-toxicity, and powerful photocatalytic potential ( Mishra et al, 2019 ; Hao et al, 2020 ; Adekoya et al, 2021 ).…”

Section: Introductionmentioning

confidence: 99%

Sustained Biotic-Abiotic Hybrids Methanogenesis Enabled Using Metal-Free Black Phosphorus/Carbon Nitride

Ren

et al. 2022

Front. Microbiol.

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Biotic-abiotic hybrid systems (BAHs) constructed by integrating biological methanogens with photocatalysts offer novel approaches for the effective solar-driven conversion of CO2 to CH4, providing significant inspiration for achieving carbon neutrality and alleviating the energy crisis. As metal photocatalysts would cause photocorrosion that damages microbial cells and lead to system imbalance. Therefore, exploring suitable metal-free photocatalysts is of particular importance in the search for more efficient and sustainable BAHs to improve the actual operability and applicability. Herein, black phosphorus/carbon nitride (BPCNx) as an alternative metal-free heterostructure was combined with Methanosarcina barkeri (M. barkeri) to construct M. barkeri-BPCNx hybrid systems, and their cyclic methanogenesis performance was investigated. Our results demonstrated that BPCNx promotes the separation of photogenerated charges and enhances the quantum yield, providing a sustained energy source for the cyclically driven M. barkeri reduction of CO2 to CH4 under visible light. Our system achieved a total CH4 yield of 1087.45 ± 29.14 μmol gcat–1 after three cycles, 1.96 times higher than that of M. barkeri-Ni@CdS. M. barkeri-BPCNx overcame the defects of the metal photocatalyst and kept cell permeability, achieving cyclic stability and effectively maintaining the activity of M. barkeri. These results highlight the viable role of BPCNx as a metal-free photocatalysts in the construction of BAHs for the sustained and efficient methanation of CO2, which is conducive to the development of an environmentally-friendly, low-cost, and efficient strategy for the conversion of CO2 to CH4.

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Fibrous red phosphorus as a non-metallic photocatalyst for the effective reduction of Cr(VI) under direct sunlight

Cited by 16 publications

References 13 publications

Template-free synthesis of Bi₂O₂CO₃ hierarchical nanotubes self-assembled from ordered nanoplates for promising photocatalytic applications

Template-free synthesis of Bi₂O₂CO₃ hierarchical nanotubes self-assembled from ordered nanoplates for promising photocatalytic applications

Red Phosphorus: An Up-and-Coming Photocatalyst on the Horizon for Sustainable Energy Development and Environmental Remediation

Sustained Biotic-Abiotic Hybrids Methanogenesis Enabled Using Metal-Free Black Phosphorus/Carbon Nitride

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Fibrous red phosphorus as a non-metallic photocatalyst for the effective reduction of Cr(VI) under direct sunlight

Cited by 16 publications

References 13 publications

Template-free synthesis of Bi2O2CO3 hierarchical nanotubes self-assembled from ordered nanoplates for promising photocatalytic applications

Template-free synthesis of Bi2O2CO3 hierarchical nanotubes self-assembled from ordered nanoplates for promising photocatalytic applications

Red Phosphorus: An Up-and-Coming Photocatalyst on the Horizon for Sustainable Energy Development and Environmental Remediation

Sustained Biotic-Abiotic Hybrids Methanogenesis Enabled Using Metal-Free Black Phosphorus/Carbon Nitride

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Template-free synthesis of Bi₂O₂CO₃ hierarchical nanotubes self-assembled from ordered nanoplates for promising photocatalytic applications

Template-free synthesis of Bi₂O₂CO₃ hierarchical nanotubes self-assembled from ordered nanoplates for promising photocatalytic applications