Abstract A novel visible-light-driven Fe and Ce bimetallic co-doped g-C3N4 (Fe-Ce/CN) photocatalyst was successfully fabricated by a straightforward method. Experimental results indicated that no matter in the single pollutant system or mixed pollutants system containing Cr(Ⅵ) and an organic dye, Fe-Ce/CN exhibits super photocatalytic activity. It is mainly caused by the synergistic effect of Fe and Ce ions. Fe inserted into the lattice of g-C3N4 could narrow the band gap and inhibit combination of photogenerated electron-hole pairs. More importantly, the existence of Fe and Ce would improve the redox cycle with each other which is benefit for further increasing charge separation, light absorption and quantum efficiency. Furthermore, the controlled experiments and electron spin resonance (ESR) were performed to identify the relevant reactive species. Possible photocatalytic process of simultaneously removing mixed pollutants and mechanism were proposed. In general, this work provides a facile method to improve the photocatalytic activity of photocatalyst.

中文翻译：

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铁和铈共掺杂g-C3N4的简便合成具有协同效应以提高可见光光催化性能

摘要 通过简单的方法成功制备了一种新型可见光驱动的 Fe 和 Ce 双金属共掺杂 g-C3N4 (Fe-Ce/CN) 光催化剂。实验结果表明，无论是在单一污染物体系还是含有Cr(Ⅵ)和有机染料的混合污染物体系中，Fe-Ce/CN都表现出超强的光催化活性。它主要是由Fe和Ce离子的协同作用引起的。Fe插入g-C3N4的晶格可以缩小带隙并抑制光生电子-空穴对的结合。更重要的是，Fe和Ce的存在会相互改善氧化还原循环，有利于进一步提高电荷分离、光吸收和量子效率。此外，进行了受控实验和电子自旋共振 (ESR) 以识别相关的反应物种。提出了可能的同时去除混合污染物的光催化过程和机理。总的来说，这项工作为提高光催化剂的光催化活性提供了一种简便的方法。