School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China.
School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China; School of Environment, State Key Joint Laboratory of Environmental Simulation and Pollution Control (SKLESPC), Beijing Key Laboratory for Emerging Organic Contaminants Control, Tsinghua University, Beijing, 100084, China.
Chemosphere. 2020 Nov;258:127343. doi: 10.1016/j.chemosphere.2020.127343. Epub 2020 Jun 11.
Hydroxyl radicals (OH) have robust non-selective oxidizing properties to effectively degrade organic pollutants. However, graphitic carbon nitride (g-CN) is restricted to directly generate OH due to its intrinsic valence band. In this study, we report a facile environmental-friendly self-modification strategy to synthesize reduced graphitic carbon nitride (RCN), with nitrogen vacancies and CN functional groups. The incorporation of CN enabled to downshift the valence band level, which endowed RCN with the capacity to directly generate OH via h. Experimental and instrumental analyses revealed the critical roles of nitrogen vacancies and CN groups in the modification of the RCN band structure to improve its visible light absorption and oxidizing capacity. With these superior properties, the RCN was significantly enhanced for the photocatalytic degradation of DCF under visible light irradiation. The self-modification strategy articulated in this study has strong potential for the creation of customized g-CN band structures with enhanced oxidation performance.
羟基自由基 (OH) 具有强大的非选择性氧化特性，可有效降解有机污染物。然而，由于其本征价带，石墨相氮化碳 (g-CN) 被限制直接生成 OH。在本研究中，我们报告了一种简便的环保自修饰策略，用于合成具有氮空位和 CN 官能团的还原石墨相氮化碳 (RCN)。CN 的掺入使价带能级向下移动，使 RCN 能够通过 h 直接生成 OH。实验和仪器分析揭示了氮空位和 CN 基团在修饰 RCN 能带结构以提高其可见光吸收和氧化能力方面的关键作用。由于这些优越的性能，RCN 在可见光照射下显著增强了 DCF 的光催化降解性能。本研究中阐述的自修饰策略具有很强的潜力，可以创建具有增强氧化性能的定制 g-CN 能带结构。
