无机/有机S型异质结构建及高级氧化技术协同光热降解抗生素研究

doi:10.1016/j.actphy.2025.100187

摘要/Abstract

摘要：

通过合理设计能够同时利用太阳能和高级氧化工艺(AOPs)的无机/有机催化剂，对抗生素污染物的降解具有重要前景。本研究采用超声辅助技术开发了具有氧空位的MoO_2-x/g-C₃N₄ (MOCN) S型异质结，并将其作为太阳能驱动的过一硫酸盐(PMS)催化剂用于抗生素降解。利用密度泛函理论、飞秒瞬态吸收光谱和原位XPS分析，证实了MoO_2-x与g-C₃N₄之间内建电场的形成以及S型异质结中的电荷转移路径。同时，MOCN异质结的氧空位和光热效应进一步加速了电子迁移速率。与原始MoO_2-x和g-C₃N₄相比，优化后的MOCN-2催化剂在20 min内对四环素(TC)去除率达到了90.9%。连续流实验和抗菌活性实验共同验证了该催化剂在水处理应用中的实际可行性。基于上述分析，提出了TC降解的可能机制。本研究为合成S型异质结以改善废水处理提供了新策略。

关键词: 高级氧化技术, 无机/有机异质结, S型机制, 抗生素降解, 光热效应

Abstract:

The rational engineering of inorganic/organic catalysts capable of concomitant utilization of solar energy and advanced oxidation processes (AOPs) holds significant promise for the degradation of antibiotic contaminants. The study developed MoO_2-x/g-C₃N₄ (MOCN) S-scheme heterojunctions with oxygen vacancies using an ultrasonic-assisted integration technique, employing them as solar-driven peroxymonosulfate (PMS) catalysts for the degradation of antibiotics. The formation of an internal electric field between MoO_2-x and g-C₃N₄, along with the charge transfer pathway in the S-scheme heterojunction, was confirmed using density functional theory, femtosecond transient absorption spectroscopy, and in-situ XPS analysis. Meanwhile, the oxygen vacancy and photothermal effect of the MOCN heterojunction further accelerate the electron migration rate. The optimized MOCN-2 catalyst achieved 90.9 % tetracycline (TC) removal within 20 min compared to pristine MoO_2-x and g-C₃N₄. Continuous flow experiments and bactericidal activity experiments together validated the practical feasibility of this catalyst for water treatment applications. The analysis above led to the proposal of a possible mechanism for TC degradation. This research brings forward new strategies for the synthesis of S-scheme heterojunctions to improve wastewater treatment.

Key words: Advanced oxidation technology, Inorganic/organic heterojunction, S-scheme mechanism, Antibiotics degradation, Photothermal effect

程强, 李静萍, 柯振东, 李嘉明, 王楷. 无机/有机S型异质结构建及高级氧化技术协同光热降解抗生素研究[J]. 物理化学学报, 2026, 42(5), 100187. doi: 10.1016/j.actphy.2025.100187

Qiang Cheng, Jingping Li, Zhendong Ke, Jiaming Li, Kai Wang. Advanced oxidation technology synergistic photothermal degradation of antibiotics over inorganic/organic S-scheme heterojunction[J]. Acta Phys. -Chim. Sin. 2026, 42(5), 100187. doi: 10.1016/j.actphy.2025.100187

链接本文: https://www.whxb.pku.edu.cn/CN/10.1016/j.actphy.2025.100187

https://www.whxb.pku.edu.cn/CN/Y2026/V42/I5/100187

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