In this work, p-phenylenediamine and L-cysteine were used as raw materials, and water-soluble N, S co-doped carbon dots (N, S-CDs) with excellent performance were prepared through a one-step solvothermal method. The morphology and structure of N, S-CDs were characterized by transmission electron microscope, X-ray diffraction, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy, and the basic photophysical properties were investigated via UV-Vis absorption spectra and fluorescence spectra. Meanwhile, the N, S-CDs have excellent luminescence stability with pH, ionic strength, radiation time, and storage time. Experimental results illustrated the present sensor platform exhibited high sensitivity and selectivity in response to baicalein with a detection limit of 85 nmol·L^-1. The quenching mechanism is proved to be the inner filter effect. In addition, this sensor can also detect baicalein in biofluids (serum and urine) with good accuracy and reproducibility.

为提升氯氧铋/硅藻土(BiOCl/D)的可见光催化性能，引入了碳量子点(CQDs)，以温和水解法成功构建了CQDs/BiOCl/D三元复合体系，并研究了其在可见光下对水中抗生素环丙沙星(CIP)的光降解性能。结果表明，当CQDs加入量为催化剂总质量的3%时，所制备的3%CQDs/BiOCl/D在90 min可见光照射后，对CIP的降解率为90.1%，同时发现在80 min照射后，CIP的抑菌活性可消除。捕获剂实验和电子顺磁共振(EPR)结果证实，3%CQDs/BiOCl/D光降解反应中主要活性物种为空穴(h⁺)、羟基自由基(·OH)和超氧自由基(·O₂^-)。通过超高效液相色谱-质谱联用(UPLC-MS/MS)数据确认了CIP降解过程的中间产物并推测其降解路径。CQDs的上转换荧光性能、催化剂的稳态和瞬态荧光光谱及其相应的光电化学测试证明，3%CQDs/BiOCl/D光催化性能提升归功于CQDs的上转换作用、电子接收性能、转移性能和光热效应以及CQDs、硅藻土与BiOCl之间的协同作用。