Li Feng, Zhu Peng, Wang Songmei, Xu Xiuquan, Zhou Zijun, Wu Chundu
Affiliated Hospital of Jiangsu University Zhenjiang 212001 China.
School of Pharmacy, Jiangsu University Zhenjiang 212013 China
RSC Adv. 2019 Jul 2;9(36):20633-20642. doi: 10.1039/c9ra02411e. eCollection 2019 Jul 1.
Low visible light response and rapid recombination of photogeneration charge carriers have always been the main factors limiting the advanced application of g-CN (CN). Element doping has been confirmed to be an efficient method to improve the photocatalytic performance of CN. Here, a series of Cu and O co-doped porous g-CN (Cu/O-PCN) nanomaterials were successfully fabricated by a facile one-pot thermal polymerization approach for the first time. Compared to pure CN, the resulting Cu/O-PCN exhibited remarkably enhanced visible-light-driven photocatalytic activity towards levofloxacin (LEVO) degradation. The optimized sample of 0.5% Cu doped (Cu/O-PCN-3) presented the highest degradation rate constant of 0.0676 min, which was about 6.2 times higher than that of CN. Furthermore, a substantial decrease in the residual toxicity against was observed after photocatalytic degradation treatment. The superior photocatalytic performance of Cu/O-PCN was mainly attributed to the synergistic advantages of stronger visible light response, larger specific surface area, and the more effective separation and transfer of photogenerated charge carriers. Moreover, according to the trapping experiments, ·O and h were the major oxygen active species in the photocatalytic degradation process. Finally, the possible enhanced photocatalytic mechanism over Cu/O-PCN was proposed.
可见光响应低和光生载流子快速复合一直是限制g-CN（CN）进一步应用的主要因素。元素掺杂已被证实是提高CN光催化性能的有效方法。在此，首次通过简便的一锅热聚合方法成功制备了一系列铜和氧共掺杂的多孔g-CN（Cu/O-PCN）纳米材料。与纯CN相比，所得的Cu/O-PCN对左氧氟沙星（LEVO）降解表现出显著增强的可见光驱动光催化活性。0.5%铜掺杂的优化样品（Cu/O-PCN-3）呈现出最高的降解速率常数0.0676 min，约为CN的6.2倍。此外，光催化降解处理后观察到对……的残留毒性大幅降低。Cu/O-PCN优异的光催化性能主要归因于更强的可见光响应、更大的比表面积以及光生载流子更有效的分离和转移的协同优势。此外，根据捕获实验，·O 和h是光催化降解过程中的主要氧活性物种。最后，提出了Cu/O-PCN上可能增强的光催化机理。
