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首页> 外文期刊>RSC Advances >One-pot construction of Cu and O co-doped porous g-C3N4 with enhanced photocatalytic performance towards the degradation of levofloxacin
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One-pot construction of Cu and O co-doped porous g-C3N4 with enhanced photocatalytic performance towards the degradation of levofloxacin

机译：一锅式构造的Cu和O共掺杂多孔g-C3N4，具有增强的光催化性能，可降解左氧氟沙星

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Low visible light response and rapid recombination of photogeneration charge carriers have always been the main factors limiting the advanced application of g-C _(3) N _(4) (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-C _(3) N _(4) (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 ~(?1) , which was about 6.2 times higher than that of CN. Furthermore, a substantial decrease in the residual toxicity against E. coli 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 _(2) ~(?) 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.
机译：低可见光响应和光生载流子的快速重组一直是限制g-C _（3）N _（4）（CN）先进应用的主要因素。已经证实元素掺杂是改善CN的光催化性能的有效方法。在这里，首次通过简便的一锅式热聚合方法成功制备了一系列Cu和O共掺杂的多孔g-C _（3）N _（4）（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）降解表现出明显增强的可见光驱动的光催化活性。优化的0.5％Cu掺杂样品（Cu / O-PCN-3）的最高降解速率常数为0.0676 min〜（？1），约为CN的6.2倍。此外，在光催化降解处理后，观察到对大肠杆菌的残留毒性显着降低。 Cu / O-PCN的优异光催化性能主要归因于协同效应，即可见光响应更强，比表面积更大以及光生电荷载流子更有效地分离和转移。此外，根据捕获实验，·O _（2）〜（？）和h〜（+）是光催化降解过程中的主要氧活性物种。最后，提出了可能的增强Cu / O-PCN光催化作用的机理。

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