High-Quantum-Yield Carbon Nitride Quantum Dots via Water Vapor Intercalation-Exfoliation for Efficient Tetracycline Hydrochloride Degradation

文献类型： 外文期刊

第一作者： Song, Wanlong

作者： Song, Wanlong;Zhang, Niuniu;Ma, Xiaojun;Li, Dongna;Li, Jie;Li, Jianing;Ma, Xiaojun

作者机构：

关键词： CNQDs; intercalation-exfoliation; nitrogen defects; oxygen doping; tetracycline hydrochloride degradation

期刊名称：SMALL （ 影响因子：12.1； 五年影响因子：12.5 ）

ISSN： 1613-6810

年卷期： 2025 年 21 卷 36 期

页码：

收录情况： SCI

摘要： Graphitic carbon nitride (g-C3N4) has demonstrated potential applications in addressing energy shortages and preserving water ecosystem stability due to its high efficiency in degrading antibiotics. However, the mediocre catalytic performance of bulk g-C3N4 is attributed to inefficient carrier transport and a high complexation rate of photogenerated electron-hole pairs. Herein, a method for fabricating carbon nitride quantum dots (CNQDs) via water vapor intercalation-exfoliation during high-temperature thermo-polymerization of g-C3N4 is proposed. The resulting CNQDs exhibit a high quantum yield (49.8%), reduced bandgap, and pH-dependent properties. Structural nitrogen defects and doping of oxygen-containing functional groups contribute to improved charge-transfer efficiency and enhanced photooxidation capacity of CNQDs from water vapor intercalation-exfoliation. Remarkably, the optimal CNQDs-650 demonstrates excellent photodegradation activity of tetracycline hydrochloride (TCH), approximate to 2.7 times higher than that of g-C3N4. Additionally, the photo degradation pathways of TCH are proposed based on identified intermediates. This study introduces a new and efficient approach to synthesizing CNQDs with high photocatalytic performance.

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