The integration of two different advanced oxidation processes can not only avoid their individual shortcomings, but also utilize the synergistic effects between them. Herein, CoFe2O4 modified g-C3N4 composite (CoFe2O4@g-C3N4) was synthesized and used for building a novel coupled system, in which two processes of visible light-activated photocatalysis and sulfate radical-based Fenton-like oxidation have been combined together to provide a synergistic reaction path for the removal of rhodamine B. The coupled system exhibited a drastically enhanced catalytic efficiency compared with the photocatalytic or Fenton-like process alone. It also showed a significantly enhanced catalytic activity compared with g-C3N4, CoFe2O4 or their simple mixture. The improved catalytic performance can be ascribed to the efficient separation of photogenerated carriers as well as more available catalytic reactive sites for peroxymonosulfate (PMS) activation due to the synergistic effects between the photocatalytic and Fenton-like processes. In 30 min, 96% RhB was degraded using PMS activated by a CoFe2O4@g-C3N4 composite with 3% CoFe2O4 loading under visible light irradiation, and the synergistic index in such system reached as high as 3.07. Such system can be used at a wide pH range of 3.0-10.0. The composite also showed good stability for its practical applications.

中文翻译：

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CoFe2O4@g-C3N4复合材料活化过硫酸盐协同光催化和类芬顿降解有机污染物

两种不同的高级氧化工艺的集成不仅可以避免它们各自的缺点，而且可以利用它们之间的协同效应。在此，合成了 CoFe2O4 修饰的 g-C3N4 复合材料 (CoFe2O4@g-C3N4) 并用于构建新型耦合系统，其中将可见光活化光催化和基于硫酸根的类芬顿氧化两个过程结合在一起，形成了一个新的耦合系统。为去除罗丹明 B 提供了协同反应路径。与单独的光催化或类芬顿过程相比，耦合系统表现出显着提高的催化效率。与 g-C3N4、Co​​Fe2O4 或它们的简单混合物相比，它还显示出显着增强的催化活性。由于光催化和类芬顿过程之间的协同作用，催化性能的提高可归因于光生载体的有效分离以及更多可用的过硫酸盐 (PMS) 活化催化反应位点。在可见光照射下，负载量为 3% CoFe2O4 的 CoFe2O4@g-C3N4 复合材料活化的 PMS 在 30 分钟内降解了 96% 的 RhB，该体系中的协同指数高达 3.07。这种系统可以在 3.0-10.0 的宽 pH 范围内使用。该复合材料在实际应用中也表现出良好的稳定性。在可见光照射下，使用负载为 3% CoFe2O4 的 CoFe2O4@g-C3N4 复合材料活化的 PMS 降解了 96% 的 RhB，该体系中的协同指数高达 3.07。这种系统可以在 3.0-10.0 的宽 pH 范围内使用。该复合材料在实际应用中也表现出良好的稳定性。在可见光照射下，使用负载为 3% CoFe2O4 的 CoFe2O4@g-C3N4 复合材料活化的 PMS 降解了 96% 的 RhB，该体系中的协同指数高达 3.07。这种系统可以在 3.0-10.0 的宽 pH 范围内使用。该复合材料在实际应用中也表现出良好的稳定性。