Photocatalytic reduction of mono, di, and tri-nitrophenols over a Bi2MoO6/carbon nitride heterojunction

We employed a solvothermal and thermal pyrolysis approach to prepare a heterojunction of oxide perovskite (Bi2MoO6) dispersed on polymeric carbon nitride (PCN) sheets. The introduction of Bi2MoO6 particles onto the PCN sheets improved the light absorption characteristics of the Bi2MoO6/PCN heterojun...

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Bibliographic Details
Published in:New journal of chemistry 2023-10, Vol.47 (38), p.17775-17782
Main Authors: Cho, Phyu Phyu, Mon, Phyu Phyu, Vidyasagar, Devthade, Madras, Giridhar, Subrahmanyam, Ch
Format: Article
Language:English
Subjects:
Carbon
Carbon nitride
Carrier recombination
Chemical reduction
Current carriers
Electromagnetic absorption
Heterojunctions
Light irradiation
Nitrophenol
Perovskites
Phenols
Photocatalysis
Photocatalysts
Pyrolysis
Reducing agents
Surface area
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Summary:We employed a solvothermal and thermal pyrolysis approach to prepare a heterojunction of oxide perovskite (Bi2MoO6) dispersed on polymeric carbon nitride (PCN) sheets. The introduction of Bi2MoO6 particles onto the PCN sheets improved the light absorption characteristics of the Bi2MoO6/PCN heterojunction. The as synthesized Bi2MoO6/PCN heterojunction exhibited a larger surface area of 24 m2 g−1, compared to the individual Bi2MoO6 (18 m2 g−1) and PCN (7 m2 g−1), respectively. This enhanced surface area provided newer catalytic sites for the heterojunction. The resulting heterojunction was employed as a photocatalyst for the reduction of a series of toxic mono, di, and tri-nitrophenols, namely 2-nitrophenol, 3-nitrophenol, 4-nitrophenol, 2,4-dinitrophenol, and 2,4,6-trinitrophenol, into industrially important amino phenols. By utilizing visible light irradiation and NaBH4 as a reducing agent, the Bi2MoO6/PCN photocatalyst demonstrated accelerated reduction kinetics compared to the individual catalysts. This enhanced performance was attributed to the larger surface area and suppressed charge carrier recombination of the Bi2MoO6/PCN heterojunction, which facilitated efficient photoreduction. Overall, this study sheds light on the promising application of oxide perovskite/PCN heterojunction systems in photocatalytic reduction reactions, offering a viable solution for mitigating emerging pollutants.
ISSN:1144-0546
1369-9261
DOI:10.1039/d3nj03243d