Tang Yonggong, Zhang Ziran, Wu Fan, Xu Tao, Li Yelei, Zhou Xin, Pan Yuwei, Wu Guangyu
College of Ecology and Environment, Co-Innovation Center for the Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037, China.
Co-Innovation Center for Efficient Processing and Utilization of Forest Resources, College of Chemical Engineering, Nanjing Forestry University, Nanjing, 210037, China.
Environ Res. 2025 Jul 1;284:122279. doi: 10.1016/j.envres.2025.122279.
Developing heterojunction photocatalysts represents a promising strategy to improve photocatalytic efficiency in wastewater treatment and address the greenhouse effect. This investigation involved the creation of a new FeO/g-CN heterojunction photocatalyst (FC-X) through a simple hydrothermal process to overcome these obstacles. The optimized FC-8 composite exhibited a high photocatalytic activity, achieving a 95.5 % degradation of RhB within 180 min and a CH production rate of 19.72 μmol g·h when exposed to visible light, demonstrating a reaction rate constant of 7.02∗10 min, which is 1.63 and 1.75 times greater than pure FeO and g-CN, respectively. Additionally, FC-8 exhibited an enhanced CO reduction rate, producing CH at 19.72 μmol g·h, surpassing FeO and g-CN by 1.91 and 8.12 times, respectively. Structural, optical, and electrochemical characterizations confirmed that the enhanced performance originates from efficient charge separation and a lower carrier recombination rate at the heterojunction interface. Active species trapping experiments showed singlet oxygen (O), superoxide radicals (O) and hydroxyl radicals (OH) drive RhB degradation, with O being the dominant contributor. The FC-8 photocatalyst also exhibited excellent stability, retaining over 90 % efficiency after four cycles. This study introduces an encouraging approach to developing heterojunction photocatalysts aimed at sustainable wastewater treatment and CO transformation.
开发异质结光催化剂是提高废水处理中光催化效率和应对温室效应的一种有前景的策略。本研究通过简单的水热法制备了一种新型的FeO/g-CN异质结光催化剂（FC-X），以克服这些障碍。优化后的FC-8复合材料表现出高光催化活性，在可见光照射下180分钟内实现了95.5%的罗丹明B降解率，CH生成速率为19.72 μmol g·h，反应速率常数为7.02∗10 min，分别是纯FeO和g-CN的1.63倍和1.75倍。此外，FC-8的CO还原速率增强，CH生成速率为19.72 μmol g·h，分别超过FeO和g-CN 1.91倍和8.12倍。结构、光学和电化学表征证实，性能的提高源于异质结界面处有效的电荷分离和较低的载流子复合率。活性物种捕获实验表明，单线态氧（O）、超氧自由基（O）和羟基自由基（OH）驱动罗丹明B降解，其中O是主要贡献者。FC-8光催化剂还表现出优异的稳定性，四个循环后仍保持超过90%的效率。本研究为开发旨在实现可持续废水处理和CO转化的异质结光催化剂引入了一种令人鼓舞的方法。
