Effective degradation of multiple antibiotics by 0D/3D/2D dual Z-heterojunction photocatalyst CdS QDs/Bi2WO6/g-C3N4 and study of degradation mechanism

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science Pub Date : 2025-03-17 DOI:10.1016/j.apsusc.2025.163004

Ying Du, Linfei Li, Yanting Tang, Juan Li, Quanhui Guo, Guikuan Yue

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Abstract

With the production and application of antibiotics, the generated substandard antibiotic wastewater has brought unprecedented damage to the environment and finally the health of human beings. To alleviate this problem, photocatalytic degradation was proposed, and various catalysts have been developed with high efficiency and low cost. Herein, a novel 0D/3D/2D dual Z-heterojunction photocatalyst CdS QDs/Bi₂WO₆/g-C₃N₄ was constructed by in-situ growth method in order to efficiently degrade multiple antibiotic pollutants. The combination of multi-dimensional materials is more conducive to the close contact between materials and the effective transport of photogenerated carriers. Results reveal that the sample of 75%CdS QDs/Bi₂WO₆/g-C₃N₄ (denoted as 0.75CSBC) showed the best degradation activity and stability for tetracycline (TC), and the degradation rate could reach 80.83 % within 12 min under visible light irradiation. Based on the detailed analysis of the results from free radical trapping experiment, Mott-Schottky test and liquid chromatography-mass spectrometry (LC-MS) test, the photocatalytic degradation mechanism and pathway were proposed. Besides, 0.75CSBC showed excellent degradation activity for levofloxacin (LVFX), oxytetracycline hydrochloride (OTC) and norfloxacin (NFLX), confirming its good universality. The multi-dimensional dual Z-heterojunction photocatalyst not only provides more active sites but also promotes the efficient migration of photogenerated charge, together with an excellent stability, indicating its wide practical application in the field of photocatalytic wastewater treatment. This work also provides an interesting method for the preparation of multi-dimensional heterogeneous catalysts.

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随着抗生素的生产和应用，产生的不合格抗生素废水给环境带来了前所未有的破坏，最终危害人类健康。为了缓解这一问题，人们提出了光催化降解技术，并开发出了各种高效、低成本的催化剂。本文采用原位生长法构建了一种新型的 0D/3D/2D 双 Z 型异质结光催化剂 CdS QDs/Bi2WO6/g-C3N4，以高效降解多种抗生素污染物。多维材料的组合更有利于材料间的紧密接触和光生载流子的有效传输。结果表明，75%CdS QDs/Bi2WO6/g-C3N4 样品（记为 0.75CSBC）对四环素（TC）的降解活性和稳定性最好，在可见光照射下 12 分钟内降解率可达 80.83%。基于对自由基捕获实验、Mott-Schottky 试验和液相色谱-质谱（LC-MS）试验结果的详细分析，提出了光催化降解机理和途径。此外，0.75CSBC 对左氧氟沙星（LVFX）、盐酸土霉素（OTC）和诺氟沙星（NFLX）均表现出优异的降解活性，证实了其良好的普适性。多维双 Z 型异质结光催化剂不仅提供了更多的活性位点，而且促进了光生电荷的有效迁移，同时还具有优异的稳定性，这表明它在光催化废水处理领域具有广泛的实际应用前景。这项工作还为制备多维异质催化剂提供了一种有趣的方法。

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来源期刊

Applied Surface Science 工程技术-材料科学：膜

CiteScore

12.50

自引率

7.50%

发文量

3393

审稿时长

67 days

期刊介绍： Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.