The establishment of a heterojunction between two semiconductors possessing compatible band structures holds significant promise for facilitating the separation and migration of photogenerated carriers, thereby engendering robust photooxidation–reduction capabilities. Herein, a novel S-scheme heterojunction material (PP-CCN), comprising polyimide (PI) and phosphate-doped porous coralline carbon nitride (P-CCN), was meticulously engineered via an in situ wet chemical synthesis approach. The sunlight photocatalytic degradation of ofloxacin in freshwater aquaculture wastewater achieved high efficiency, which was 22.22-fold and 3.61-fold higher than that of pure PI and P-CCN, respectively. The charge transfer mechanism within the S-scheme heterojunction was corroborated through in situ X-ray photoelectron spectroscopy, electron paramagnetic resonance, and theoretical calculations. Furthermore, the PP-CCN/solar photocatalytic system exhibited exceptional versatility across a broad spectrum of concentration gradients, pH conditions, mineralization capacities, and challenging ionic environments or water matrices. Subsequent assessments of reusability and degradation efficacy against 26 kinds of organic pollutants underscored its potential as an efficient treatment modality for multifarious pollution scenarios.

中文翻译：

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聚酰亚胺/磷酸盐掺杂多孔珊瑚氮化碳S型异质结高效光催化降解氧氟沙星


在具有兼容能带结构的两种半导体之间建立异质结对于促进光生载流子的分离和迁移具有重大前景，从而产生强大的光氧化还原能力。在此，通过原位湿化学合成方法精心设计了一种新型S型异质结材料（PP-CCN），包含聚酰亚胺（PI）和磷酸盐掺杂的多孔珊瑚氮化碳（P-CCN）。太阳光光催化降解淡水养殖废水中的氧氟沙星取得了较高的效率，分别比纯PI和P-CCN高22.22倍和3.61倍。通过原位X射线光电子能谱、电子顺磁共振和理论计算证实了S型异质结内的电荷转移机制。此外，PP-CCN/太阳能光催化系统在广泛的浓度梯度、pH 条件、矿化能力以及具有挑战性的离子环境或水基质中表现出卓越的多功能性。随后对 26 种有机污染物的可重复使用性和降解功效的评估强调了其作为多种污染场景的有效处理方式的潜力。