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S-scheme MnIn2S4/COF heterojunction for visible-light-driven H2O2 generation: toward green and efficient water disinfection.

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Title: S-scheme MnIn2S4/COF heterojunction for visible-light-driven H2O2 generation: toward green and efficient water disinfection.
Authors: Lai, Xiaofang1 (AUTHOR), Lin, Yuling1 (AUTHOR), Yang, Wenjun1 (AUTHOR), Chen, Ziyan1 (AUTHOR), Chen, Qiaoshan1 (AUTHOR), Huang, Guocheng1 (AUTHOR) huanggch@fzu.edu.cn, Bi, Jinhong1,2 (AUTHOR) bijinhong@fzu.edu.cn
Source: Chemical Engineering Science. Dec2025, Vol. 318, pN.PAG-N.PAG. 1p.
Subjects: Hydrogen peroxide, Water disinfection, Photocatalysis, Water purification, Photocatalysts, Bacterial inactivation, Heterojunctions
Abstract: [Display omitted] • MnIn 2 S 4 /COF heterojunctions enable H 2 O 2 generation and disinfection in diverse systems. • S-scheme charge transfer confirmed by in-situ XPS and KPFM. • Enhanced internal electric field promotes photogenerated carrier separation. • H 2 O 2 and O 2 − synergistically achieve bacterial inactivation. • Bacterial death results from oxidative stress and metabolic disruption. Hydrogen peroxide (H 2 O 2) is recognized as an environmentally benign oxidant with widespread applications in the water treatment and disinfection industry. However, conventional anthraquinone-based methods for H 2 O 2 production are characterized by high energy consumption and the generation of hazardous byproducts, necessitating the development of more sustainable alternatives. In this study, we present an S-scheme heterojunction constructed from MnIn 2 S 4 and a covalent organic framework (COF), which exhibits an enhanced internal electric field (IEF) to facilitate efficient photocatalytic H 2 O 2 synthesis without the use of sacrificial agents. This heterojunction demonstrates superior charge separation and transfer capabilities, achieving a remarkably high H 2 O 2 production rate of 4007 μmol·g−1·h−1 under visible light irradiation and an unprecedented apparent quantum yield of 7.14%. Mechanistic investigations reveal that the S-scheme charge transfer pathway optimizes redox reactions, while the photosynthesized H 2 O 2 and its precursors, superoxide radicals, synergistically disrupt bacterial defense mechanisms by inhibiting key antioxidant enzymes (e.g., superoxide dismutase, catalase, and glutathione) and impairing energy metabolism, ultimately leading to bacterial cell death. Notably, the optimal sample exhibits sustained performance in diverse real water matrices, including river and seawater, under natural sunlight conditions, with negligible effluent toxicity. This work provides a sustainable strategy for H 2 O 2 production and water purification, offering insights into the rational design of advanced photocatalytic materials for the water disinfection industry. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:[Display omitted] • MnIn 2 S 4 /COF heterojunctions enable H 2 O 2 generation and disinfection in diverse systems. • S-scheme charge transfer confirmed by in-situ XPS and KPFM. • Enhanced internal electric field promotes photogenerated carrier separation. • H 2 O 2 and O 2 − synergistically achieve bacterial inactivation. • Bacterial death results from oxidative stress and metabolic disruption. Hydrogen peroxide (H 2 O 2) is recognized as an environmentally benign oxidant with widespread applications in the water treatment and disinfection industry. However, conventional anthraquinone-based methods for H 2 O 2 production are characterized by high energy consumption and the generation of hazardous byproducts, necessitating the development of more sustainable alternatives. In this study, we present an S-scheme heterojunction constructed from MnIn 2 S 4 and a covalent organic framework (COF), which exhibits an enhanced internal electric field (IEF) to facilitate efficient photocatalytic H 2 O 2 synthesis without the use of sacrificial agents. This heterojunction demonstrates superior charge separation and transfer capabilities, achieving a remarkably high H 2 O 2 production rate of 4007 μmol·g−1·h−1 under visible light irradiation and an unprecedented apparent quantum yield of 7.14%. Mechanistic investigations reveal that the S-scheme charge transfer pathway optimizes redox reactions, while the photosynthesized H 2 O 2 and its precursors, superoxide radicals, synergistically disrupt bacterial defense mechanisms by inhibiting key antioxidant enzymes (e.g., superoxide dismutase, catalase, and glutathione) and impairing energy metabolism, ultimately leading to bacterial cell death. Notably, the optimal sample exhibits sustained performance in diverse real water matrices, including river and seawater, under natural sunlight conditions, with negligible effluent toxicity. This work provides a sustainable strategy for H 2 O 2 production and water purification, offering insights into the rational design of advanced photocatalytic materials for the water disinfection industry. [ABSTRACT FROM AUTHOR]
ISSN:00092509
DOI:10.1016/j.ces.2025.122177