Microcystin-LR (MC-LR) is susceptible to degradation by singlet oxygen (¹O₂) attack due to multiple unsaturated olefinic bond sites. In this study, the Z-scheme heterojunction α-Fe₂O₃/tubular g-C₃N₄ with C defects (α-Fe₂O₃/TDCN) was synthesized via hydrothermal and cocalcination methods. The efficient generation of ¹O₂ was realized by enhancing the photogenerated carrier separation and oxygen adsorption capabilities and was used to investigate the degradation process and mechanism of MC-LR. The results show that the degradation rate of MC-LR can reach nearly 100% within 60 min under visible light irradiation, and α-Fe₂O₃/TDCN possesses good stability and environmental friendliness. The relationship between photocatalyst performance and ¹O₂ generation was analyzed by density functional theory (DFT) calculations. Based on probe experiments, LC–MS data, and DFT calculations, the mineralization process of MC-LR dominated by ¹O₂ was analyzed. This study provides a reference for addressing MC-LR pollution in eutrophic aquatic environments and the direction of specific control of MC-LR mineralization.

中文翻译：

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具有 C 缺陷的 Z 型异质结 α-Fe2O3/管状 g-C3N4 用于光催化降解水中微囊藻毒素-LR：关键物种 1O2 的产生和影响

由于存在多个不饱和烯键位点，微囊藻毒素-LR (MC-LR) 很容易受到单线态氧 ( ¹ O ₂ ) 攻击而降解。本研究通过水热和共煅烧方法合成了具有C缺陷的Z型异质结α-Fe ₂ O ₃ /管状gC ₃ N ₄ (α-Fe ₂ O _{3 /TDCN)。通过增强光生载流子分离和氧吸附能力实现了}¹ O ₂的高效生成，并用于研究MC-LR的降解过程和机理。结果表明，可见光照射下60 min内MC-LR的降解率接近100%，α-Fe ₂ O ₃ /TDCN具有良好的稳定性和环境友好性。通过密度泛函理论(DFT)计算分析了光催化剂性能与¹ O ₂生成之间的关系。基于探针实验、LC-MS数据和DFT计算，分析了以¹ O ₂为主的MC-LR的矿化过程。该研究为解决富营养化水环境MC-LR污染和针对性控制MC-LR矿化提供了参考。