【摘要】 采用煅烧-沉积法制备了非金属硫（S）和单质银（Ag⁰）改性的g-C₃N₄,对改性的催化剂进行了详细的表征.将改性的g-C₃N₄应用于光催化降解常用的抗生素——四环素,可见光下短短的28 min,就可将四环素完全降解.同时,也能快速完全降解其他有机污染物,如（15 min）罗丹明B （RhB）、（12 min）甲基橙（MO）和（150 min）卡马西平（CBZ）.合成催化剂的高效光催化性能主要归因于:g-C₃N₄氧化还原电位的调节、可见光利用率的提升、复合物比表面积的增大及电子-空穴的分离率的增强.活性物种捕获实验表明,·O^-₂是最主要的反应活性物种,提出了复合物光催化快速降解四环素反应可能的机制.此外,复合催化剂具有良好的重复使用率和结构稳定性.更多还原

【Abstract】 The photocatalyst of Ag⁰ deposition in sulfur doped g-C₃N₄（Ag-S-CN） was synthesized and characterized in detail, and the Ag-S-CN was applied to eliminate the refractory pollutant-Tetracycline. In merely 28 min, tetracycline could be completely degradated under visible-light irradiation. This excellent photocatalytic performance of the as-synthesized photocatalysts might be attributed to that the redox band potentials were modulated, the visible light utilization rate was improved, the specific surface area was increased and the separation rate of photogenic carrier separation was enhanced. In addition, the possible reaction mechanism of tetracycline degradation was proposed. Repeated experiments and structural analysis of photocatalyst demonstrated that the photocatalyst exhibits good stability and reusability. This study provides a new insight into realizing rapid degradation of refractory pollutant under visible light.更多还原