Abstract Nitrogen and phosphorus co-doped graphene quantum dot-modified Bi5O7I (NPG/Bi5O7I) nanorods were fabricated via a simple solvothermal method. The morphology, structure, and optical properties of the as-prepared samples were investigated by X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy (XPS), and diffused reflectance spectroscopy. The photocatalytic performance was estimated by degrading the broad-spectrum antibiotics tetracycline and enrofloxacin under visible light irradiation. The photodegradation activity of Bi5O7I improved after its surface was modified with NPGs, which was attributed to an increase in the photogenerated charge transport rate and a decrease in the electron-hole pair recombination efficiency. From the electron spin resonance spectra, XPS valence band data, and free radical trapping experiment results, the main active substances involved in the photocatalytic degradation process were determined to be photogenerated holes and superoxide radicals. A possible photocatalytic degradation mechanism for NPG/Bi5O7I nanorods was proposed.

中文翻译：

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氮磷共掺杂石墨烯量子点/Bi5O7I复合材料的构建加速电荷分离和增强光催化降解性能

摘要 通过简单的溶剂热法制备了氮磷共掺杂石墨烯量子点修饰的 Bi5O7I (NPG/Bi5O7I) 纳米棒。通过 X 射线衍射、扫描电子显微镜、高分辨率透射电子显微镜、X 射线光电子能谱 (XPS) 和漫反射光谱研究了所制备样品的形貌、结构和光学性质。通过在可见光照射下降解广谱抗生素四环素和恩诺沙星来评估光催化性能。用NPGs修饰Bi5O7I表面后，其光降解活性提高，这归因于光生电荷传输速率的增加和电子-空穴对复合效率的降低。从电子自旋共振谱，XPS价带数据和自由基捕获实验结果表明，参与光催化降解过程的主要活性物质为光生空穴和超氧自由基。提出了一种可能的 NPG/Bi5O7I 纳米棒光催化降解机制。