物理化学学报 >> 2026, Vol. 42 >> Issue (1): 100135.doi: 10.1016/j.actphy.2025.100135

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废弃医用口罩衍生的碳量子点增强BiOBr/g-C3N4 S型异质结光催化降解聚对苯二甲酸乙二醇酯(PET)

陈轼逸, 付家龙, 裘建平, 常国菊, 郝仕油*()   

  1. 浙江师范大学行知学院, 化学与材料科学学院, 浙江 金华 321004
  • 收稿日期:2025-06-22 修回日期:2025-07-19 录用日期:2025-07-23 发布日期:2025-11-01
  • 通讯作者: Email: sky54@zjnu.cn (郝仕油)

Waste medical mask-derived carbon quantum dots enhance the photocatalytic degradation of polyethylene terephthalate (PET) over BiOBr/g-C3N4 S-scheme heterojunction

Shiyi Chen, Jialong Fu, Jianping Qiu, Guoju Chang, Shiyou Hao*()   

  1. Xingzhi College, College of Chemistry and Materials Science, Zhejiang Normal University, Jinhua 321004, Zhejiang Province, China
  • Received:2025-06-22 Revised:2025-07-19 Accepted:2025-07-23 Published:2025-11-01
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摘要：

2019冠状病毒病(COVID-19)的大流行增加了医用口罩的需求，迄今为止，许多废弃口罩未经再处理就被丢弃，造成了环境的破坏。PET作为一种常用的塑料产品，其自然降解存在一定的障碍。在本研究中，通过简单的溶剂热法将废弃医用口罩转化为具有蓝色荧光发射的碳量子点(MCQDs)，然后将其掺杂到BiOBr/g-C3N4复合材料中，构建S型异质结用于PET降解。密度泛函理论(DFT)计算表明，g-C3N4和BiOBr之间形成了界面电场(IEF)。研究结果表明，MCQDs作为电子传输和存储的助催化剂，促进了S型异质结进一步分离光生电子和空穴。左氧氟沙星(LEV)被用作分子探针，直观地比较了各种催化剂的催化活性。这些具有不同光催化活性的催化剂随后被用于降解PET。研究结果表明，BiOBr/g-C3N4/3MCQDs在海水中对于PET的降解效率为39.88% ± 1.04% (重量损失)，比BiOBr/g-C3N4高1.37倍，并且优于大多数文献报道的结果。自由基捕获实验、静电场轨道阱高分辨率气相色谱质谱联用(HRGC-MS)和超高效液相色谱质谱联用(UPLC-MS)实验数据揭示并简要分析了PET光催化降解过程中的关键产物，以及PET光催化降解的相关机理。降解产物有望成为进一步生产聚合物和药物等的前体。本研究为开发用于PET生态友好降解的创新光催化剂提供了新的视角，有助于进一步减少微塑料(MPs)造成的环境损害，并提高资源的可持续性。

关键词: 废弃医用口罩, 光催化, 微塑料, PET降解, 碳量子点, S型异质结

Abstract:

The coronavirus disease 2019 (COVID-19) pandemic has increased the necessity of medical masks, and to date, many waste masks have been discarded without being reprocessed, causing environmental harm. PET, a commonly used plastic product, presents certain hurdles to its natural degradation. In this work, waste medical masks were converted into carbon quantum dots (MCQDs) with blue fluorescence emissions using a simple solvothermal process and then doped into BiOBr/g-C3N4 composite material to construct S-scheme heterojunctions for PET degradation. Density functional theory (DFT) calculations revealed that an interfacial electric field (IEF) was formed between g-C3N4 and BiOBr. The findings demonstrate that the MCQDs, as a cocatalyst for electron transmission and storage, encourage S-scheme heterojunctions to further separate photogenerated electrons and holes. Levofloxacin (LEV) was used as a molecular probe to visually compare the catalytic activities of various catalysts. These catalysts with different photocatalytic activity were then used to degrade PET. The findings demonstrate that the degradation efficiency of PET over the BiOBr/g-C3N4/3MCQDs in seawater is 39.88 ± 1.04% (weight loss), which is 1.37 times higher than that of BiOBr/g-C3N4, and also better than those reported in most of the literature. Free radical capture tests, electrostatic field orbital trap high-resolution gas chromatography-mass spectrometry (HRGC-MS), and ultra-performance liquid chromatography-mass spectrometry (UPLC-MS) experiments uncovered and briefly revealed the key products in the photocatalytic degradation of PET, as well as the relevant mechanism of photocatalytic degradation of PET. The degradation products are expected to become precursors for the further production of polymers and medicines, etc. This study offers fresh perspectives for the creation of innovative photocatalysts for the ecologically benign breakdown of PET, which helps to further lessen environmental damage caused by microplastics (MPs) and enhance resource sustainability.

Key words: Waste medical mask, Photocatalysis, Microplastics, PET degradation, Carbon quantum dots, S-scheme heterojunctions