Photo-Fenton enhanced self-floating Z-scheme Prussian blue/Mn3O4 heterojunction for efficient levofloxacin degradation: Mechanism, pathway and DFT analysis

IF 5.4 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2025-10-11 DOI:10.1016/j.colsurfa.2025.138653

Fenfen Xi , Mengyuan Yue , Jinhui Zhao , Kongliang Xie , Jianfeng Ma , Xiyu Song , Liping Liang , Aiqin Hou

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Abstract

This study constructed a Z-scheme p-n heterojunction (M-PB) using n-type Prussian blue (PB) and p-type Mn₃O₄, immobilized on cellulose aerogel (M-PB-AG), for levofloxacin (LVF) degradation via photo-Fenton technology. Optical and electrochemical characterization confirmed the successful Z-scheme heterojunction formation, with optimized band alignment enabling efficient electron transfer from PB to Mn₃O₄ while suppressing charge recombination. The experimental results demonstrated a strong synergistic effect between Mn₃O₄ and PB (74.2 %), photocatalysis (Vis) and the Fenton reaction (H₂O₂) (65.8 %). In Vis/H₂O₂/M-PB-AG system at pH = 5, M-PB-AG achieve 93.9 % LVF degradation in 60 min. The Vis/H₂O₂/M-PB-AG system degraded LVF mainly via non-radical ¹O₂, with additional h⁺/e⁻ and O₂^•− contributions. Fe/Mn valence cycling enabled continuous reactive oxygen species (ROS) generation, maintaining 80.1 % efficiency after 5 cycles. Continuous flow experiments confirmed practical application potential. The process remained effective regardless of pH, ions, organics, or oxygen. DFT and LC-MS revealed degradation pathways and product toxicity. This work provides new insights for developing efficient photocatalysts for water treatment.

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光- fenton增强自漂浮Z-scheme普鲁士蓝/Mn3O4异质结高效降解左氧氟沙星：机理、途径和DFT分析

本研究以n型普鲁士蓝（PB）和p型Mn3O4为材料，在纤维素气凝胶（M-PB- ag）上固定化，构建了z型p-n异质结（M-PB），用于光- fenton技术降解左氧氟沙星（LVF）。光学和电化学表征证实了Z-scheme异质结的成功形成，优化的能带对准使电子从PB向Mn3O4有效转移，同时抑制了电荷重组。实验结果表明，Mn3O4与PB（74.2 %）、光催化（Vis）和Fenton反应（H2O2）（65.8% %）之间具有较强的协同效应。在pH = 5的Vis/H2O2/M-PB-AG体系中，M-PB-AG在60 min内对LVF的降解率达到93.9 %。Vis/H2O2/M-PB-AG体系主要通过非自由基1O2降解LVF，并有额外的h+/e−和O2•−贡献。Fe/Mn价循环使活性氧（ROS）持续生成，5次循环后效率保持在80.1 %。连续流动实验证实了实际应用潜力。无论pH值、离子、有机物或氧气如何，这个过程都是有效的。DFT和LC-MS揭示了降解途径和产物毒性。这项工作为开发高效的水处理光催化剂提供了新的思路。

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来源期刊

Colloids and Surfaces A: Physicochemical and Engineering Aspects 化学-物理化学

CiteScore

8.70

自引率

9.60%

发文量

2421

审稿时长

56 days

期刊介绍： Colloids and Surfaces A: Physicochemical and Engineering Aspects is an international journal devoted to the science underlying applications of colloids and interfacial phenomena. The journal aims at publishing high quality research papers featuring new materials or new insights into the role of colloid and interface science in (for example) food, energy, minerals processing, pharmaceuticals or the environment.