Tuning visible light-driven photocatalytic NO removal: Insights from glucose-derived CQDs/ZnO nanorods composite
The potential of visible light photocatalysis in mitigating environmental pollutants has gained significant attention. In this study, we investigate the photocatalytic NO removal efficiency of oxygen defect-rich zinc oxide nanorods (ZnO NRs), facilitated by the incorporation of carbon quantum dots (...
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Veröffentlicht in: | Journal of environmental chemical engineering 2023-12, Vol.11 (6), p.111561, Article 111561 |
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Sprache: | eng |
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Zusammenfassung: | The potential of visible light photocatalysis in mitigating environmental pollutants has gained significant attention. In this study, we investigate the photocatalytic NO removal efficiency of oxygen defect-rich zinc oxide nanorods (ZnO NRs), facilitated by the incorporation of carbon quantum dots (CQDs) under mild conditions. The successful integration of CQDs with ZnO NRs represents a novel and sustainable approach for efficient NO removal under visible light irradiation. Notably, the CQDs/ZnO NRs shows a substantial increase in NO removal efficiency (71.9%), low toxicity (2.7%) and durability (only 7.7% efficiency reduction after five cycles). The synergetic effects of CQDs and oxygen defects within the ZnO NRs structure, which broadens the light absorption spectrum, facilitates electron separation, thus enhanced photocatalytic NO removal. Furthermore, photoluminescence, active species trapping experiments, and electron spin resonance analysis have confirmed the generation of hydroxyl radicals (•OH) and superoxide radicals (•O2–) during the excitation of electrons. Finally, the synergetic mechanism of CQDs and oxygen defects in ZnO NRs for amplifying visible-light-driven photocatalytic NO removal was elucidated.
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•CQDs/ZnO nanorods (NRs) were synthesized by one-step solvothermal in mild condition.•Addition of CQDs successfully increased ZnO NRs NOx degradation performance by 9.7%.•Synergistic effects of CQDs and oxygen defects played a key role in improved photocatalytic performance.•The photocatalytic mechanism of incorporation of CQDs into oxygen-rich defects ZnO nanorods have been elucidated.•CQDs/ZnO NRs have low toxicity, high stability & reusability under visible light. |
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ISSN: | 2213-3437 |
DOI: | 10.1016/j.jece.2023.111561 |