Internal electric field steering S-scheme charge transfer in ZnIn2S4/COF boosts H2O2 photosynthesis from water and air for sustainable disinfection

IF 10.4 1区工程技术 Q1 ENGINEERING, CHEMICAL npj Clean Water Pub Date : 2025-01-21 DOI:10.1038/s41545-025-00437-7

Linlin Zhuo, Shaofeng Dong, Yik Tung Sham, Jinpeng Zhang, Xiaoying Xu, Kenrick Chun Kiu Ho, Min Pan, Qiaoshan Chen, Guocheng Huang, Jinhong Bi

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Abstract

The global need for clean water and sanitation drives the development of eco-friendly and efficient water treatment technologies to combat biological pollution from pathogens. In this study, a novel heterojunction photocatalyst was synthesized by incorporating ZnIn₂S₄ into covalent organic frameworks (COFs) to enable environmentally friendly hydrogen peroxide (H₂O₂) photosynthesis and explore its potential for in situ disinfection. The ZnIn₂S₄/COF photocatalyst achieved remarkable H₂O₂ yields of 1325 µmol∙g⁻¹∙h⁻¹, surpassing pristine COF and ZnIn₂S₄ by factors of 3.12 and 16.2, respectively. The produced H₂O₂ was efficiently activated into hydroxyl radicals (·OH) through reaction with Fe(II), enabling rapid sterilization via a photocatalysis-self-Fenton system. Mechanistic insights, supported by physicochemical characterizations and theoretical calculations, highlighted the role of the internal electric field (IEF) in enhancing carrier separation and transfer, thereby boosting photosynthesis efficiency. This work presents a sustainable approach to H₂O₂ photosynthesis and activation for disinfection, offering a promising solution to global water treatment challenges.

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内部电场引导 ZnIn2S4/COF 中的 S 型电荷转移，促进水和空气中 H2O2 的光合作用，实现可持续消毒

全球对清洁水和卫生设施的需求推动了生态友好和高效水处理技术的发展，以对抗病原体的生物污染。在本研究中，将ZnIn2S4加入共价有机框架（COFs）合成了一种新型异质结光催化剂，以实现环境友好的过氧化氢（H2O2）光合作用，并探索其原位消毒的潜力。ZnIn2S4/COF光催化剂的H2O2产率为1325µmol∙g−¹∙h−¹，比原始COF和ZnIn2S4分别高出3.12和16.2倍。生成的H2O2通过与Fe（II）的反应有效地活化成羟基自由基（·OH），实现了光催化-自fenton系统的快速杀菌。在物理化学表征和理论计算的支持下，机制见解强调了内部电场（IEF）在增强载流子分离和转移方面的作用，从而提高了光合作用效率。这项工作提出了一种可持续的H2O2光合作用和活化消毒方法，为全球水处理挑战提供了一个有希望的解决方案。

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来源期刊

npj Clean Water Environmental Science-Water Science and Technology

CiteScore

15.30

自引率

2.60%

发文量

审稿时长

5 weeks

期刊介绍： npj Clean Water publishes high-quality papers that report cutting-edge science, technology, applications, policies, and societal issues contributing to a more sustainable supply of clean water. The journal's publications may also support and accelerate the achievement of Sustainable Development Goal 6, which focuses on clean water and sanitation.