Constructing a novel photocatalyst to realize both pollutant oxidation and evolved CO₂ reduction in one photoredox cycle can significantly reframe the role of pollutant management. Here, self-floating poly(bismaleimide-co-divinylbenzene) porous microspheres (PBMs) are filled with ZnSnO₃ quantum dots (ZSO QDs) to construct a polymer composite microreactor with an S-scheme heterojunction (ZSO QDs/AP-PBMs). This microreactor realizes efficient catalytic oxidation and degradation of antibiotic pollutants under light, and the CO₂ generated in this process is reduced to high value-added CO, allowing for the direct conversion of pollutants to a resource in one photoredox cycle. The high specific surface area of the PBMs enables the rapid and efficient adsorption of levofloxacin (LVX), and the self-floating porous design effectively solves the problem of CO₂ adsorption and mass transfer in the gas–liquid–solid three-phase system, while the S-scheme heterostructure enhances charge carrier separation. As a result, ZSO QDs/AP-PBMs achieves complete degradation of LVX in one redox cycle with 100% selectivity to produce 100.3 µmol g⁻¹ CO, and further draw a conclusion that fluoroquinones antibiotics as excellent electron donors can significantly enhance co-catalytic effect with CO₂, which is not previously reported. Theoretical calculations and characterization experiments provide information on S-scheme heterojunction transfer mechanism and possible degradation pathways, allowing for the rational design of photoredox bifunctional catalysts.

中文翻译：

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自漂浮聚合物微反应器可在一个光氧化还原循环中高效协同 CO2 光还原和抗生素降解


构建一种新型光催化剂，在一个光氧化还原循环中实现污染物氧化和CO ₂ 还原，可以显着重塑污染物管理的作用。这里，自浮式聚（双马来酰亚胺-共-二乙烯基苯）多孔微球（PBM）填充ZnSnO ₃ 量子点（ZSO QD），构建具有S型异质结（ZSO QD）的聚合物复合微反应器/AP-PBM）。该微反应器实现了光下抗生素污染物的高效催化氧化降解，且该过程中产生的CO ₂ 被还原为高附加值的CO，实现了污染物在一次光氧化还原中直接转化为资源循环。 PBM的高比表面积能够快速高效地吸附左氧氟沙星（LVX），自浮式多孔设计有效解决了气液循环中CO ₂ 的吸附和传质问题。固体三相体系，而S型异质结构增强了载流子分离。结果，ZSO QDs/AP-PBMs在一个氧化还原循环中实现了LVX的完全降解，选择性为100%，产生100.3 µmol g ⁻¹ CO，并进一步得出结论：氟醌类抗生素作为优异的电子供体可以显着增强与CO ₂ 的共催化效果，这是以前未报道过的。理论计算和表征实验提供了有关S型异质结转移机制和可能的降解途径的信息，从而可以合理设计光氧化还原双功能催化剂。