A novel nitrogen doped carbon quantum dots (N-CQDs) mediated Ag₃PO₄/BiVO₄ Z-scheme photocatalyst was synthesized through a solvothermal-precipitation method. The as-prepared photocatalysts were comprehensive characterized by X-ray diffraction, X-ray photo-electron spectroscopy, scanning electron microscopy, transmission electron micrograph, UV–vis diffuse reflection spectroscopy, vis photoluminescence and electron spin resonance analysis. The photocatalytic performances of as-prepared photocatalysts were used for degradation of tetracycline (TC) under visible-light illumination. Results exhibited the increased photocatalytic efficiency of BiVO₄/N-CQDs/Ag₃PO₄-10 (Ag₃PO₄ with the mass ratio of BiVO₄/N-CQDs/Ag₃PO₄ = 10%) to photodegrade TC is up to 88.9% in 30 min and 59.8% mineralization in 90 min. The degradation reaction coefficient (k) is about 6.00, 2.78 and 1.80 times higher than that of BiVO_4, N-CQDs/BiVO₄ and Ag₃PO₄/BiVO₄, respectively. The excellent photocatalytic performance of the Z-scheme BiVO₄/N-CQDs/Ag₃PO₄ was attributed to the construction of Z-scheme system, increased light harvesting capacity and improved molecular oxygen activation ability. Moreover, the photocatalytic activity of BiVO₄/N-CQDs/Ag₃PO₄ remained 79.9% after five cycling runs, indicating the high stability and reusability of the as-prepared photocatalyst. Additionally, a possible photocatalytic mechanism of the novel Z-scheme BiVO₄/N-CQDs/Ag₃PO₄ was proposed.

通过溶剂热沉淀法合成了一种新型的氮掺杂碳量子点（N-CQDs）介导的Ag ₃ PO ₄ / BiVO ₄ Z-方案光催化剂。所制备的光催化剂通过X射线衍射，X射线光电子能谱，扫描电子显微镜，透射电子显微镜，UV-可见漫反射光谱，可见光致发光和电子自旋共振分析进行了全面表征。将所制备的光催化剂的光催化性能用于可见光下的四环素（TC）降解。结果显示BiVO ₄ / N-CQDs / Ag ₃ PO ₄ -10（Ag ₃PO ₄与BiVO的质量比₄ / N-CQDs /银₃ PO ₄  = 10％）光降解TC是高达88.9％，30分钟和59.8％矿化中90分钟。降解反应系数（k）分别是BiVO _4， N-CQDs / BiVO ₄和Ag ₃ PO ₄ / BiVO _4的6.00倍，2.78倍和1.80倍。Z型BiVO ₄ / N-CQDs / Ag ₃ PO ₄的优异光催化性能归因于Z方案系统的构建，增加的光收集能力和提高的分子氧活化能力。此外，BiVO ₄ / N-CQDs / Ag ₃ PO ₄的光催化活性在五个循环运行后仍保持79.9％，表明所制备的光催化剂具有很高的稳定性和可重复使用性。此外，提出了一种新颖的Z-方案BiVO ₄ / N-CQDs / Ag ₃ PO ₄的可能的光催化机理。