Institute of Culture and Heritage, Northwestern Polytechnical University, Xi'an, 710000, China; School of Chemistry and Chemical Engineering, State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150001, China; School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710000, China; The Key Scientific Research Base of the State Administration of Cultural Relics for the Protection and Restoration of the Collection Murals and Materials Science Research, Xi'an, 710000, China.
School of Chemistry and Chemical Engineering, State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150001, China.
Chemosphere. 2022 Feb;289:133195. doi: 10.1016/j.chemosphere.2021.133195. Epub 2021 Dec 6.
To develop a heterogeneous Fenton-like catalyst with desirable activity and reusability remains a great challenge for the practical degradation of environmental remediation. Herein, we demonstrate a dendritic Fe-Cu bimetallic catalyst consisted of a Cu/FeO shell and a FeCu core (E100). In comparisons of single Cu, Fe and FeO, E100 performs far better performance for the Fenton-like degradation of phenol, and its dominant Fenton-like active centers are Fe species under acidic pH or Cu species under neutral pH. Particularly, Cu-based Fenton-like reactions are greatly accelerated by galvanic micro-cells effects that come from the special co-existence of Cu/FeO shell, and subsequently, owing to the Cu leaching from the shell, the inner FeCu core of E100 is able to be exposed and further strengthen Fe-based Fenton-like reactions. Overall, the appropriate synergistic effects endow E100 with superior catalytic activity and reusability than other catalysts. Our work pushes forward a step for understanding the catalytic mechanism of Fe-Cu bimetallic catalysts and provides new sights for fabricating efficient Fenton-like catalysts for environmental remediation.
为了开发具有理想活性和可重复使用性的非均相类 Fenton 催化剂，在环境修复的实际降解中仍然是一个巨大的挑战。在此，我们展示了一种树枝状的 Fe-Cu 双金属催化剂，由 Cu/FeO 壳和 FeCu 核（E100）组成。在比较单 Cu、Fe 和 FeO 时，E100 对苯酚的类 Fenton 降解表现出更好的性能，其主要的类 Fenton 活性中心在酸性 pH 下是 Fe 物种，在中性 pH 下是 Cu 物种。特别是，由于特殊的 Cu/FeO 壳的共存，电偶微电池效应极大地加速了基于 Cu 的类 Fenton 反应，随后，由于壳中的 Cu 浸出，E100 的内部 FeCu 核得以暴露，并进一步增强了基于 Fe 的类 Fenton 反应。总的来说，适当的协同效应赋予了 E100 比其他催化剂更高的催化活性和可重复使用性。我们的工作推动了对 Fe-Cu 双金属催化剂催化机制的理解，并为用于环境修复的高效类 Fenton 催化剂的制备提供了新的思路。
