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Enhancing the Fenton-like reactions performance of copper-iron oxide by inducing a lower valence state using oxidized g-C3N4 support
Colloids and Surfaces A: Physicochemical and Engineering Aspects ( IF 4.9 ) Pub Date : 2024-01-02 , DOI: 10.1016/j.colsurfa.2023.133135
Zhijia Liu , Xinyi Ge , Yuechao Wang , Suyu Jiang , Shaohui Sun

Copper and iron metal oxides are frequently utilized as Fenton-like catalysts, promoting H2O2 decomposition to produce •OH. However, synthesizing bimetallic copper-iron catalysts often requires a significant pH difference, resulting in uneven dispersion of the metals on the microscopic scale, limiting their synergistic effect. In this study, highly dispersed bimetallic copper-iron catalysts were constructed by adding a ligand to simultaneously precipitate Fe3+ and Cu2+ during the hydrothermal process. In addition, the dispersion of the active catalytic components was enhanced by oxidizing g-C3N4 as support, which significantly improved the Fenton-like activity. The surface electron transfer of oxidized g-C3N4 and the bimetallic copper-iron catalyst, as well as the synergistic effect between copper and iron, promoted the cycling of Cu2+/Cu+ and Fe3+/Fe2+, which could degrade 99.4% of 500 mg/L of rhodamine B within 90 min. Characterization techniques (XRD, BET, SEM, XPS, Zeta potential) confirm the advantages: large specific surface area, high dispersibility, and the presence of low-valence metals. Free radical quenching experiments and EPR characterization demonstrated that •OH and 1O2 were the primary reactive oxidation species. The degradation of rhodamine B by Cu2Fe@OCN in fixed-bed experiments showed remarkable stability and reactivity.



中文翻译:

使用氧化 g-C3N4 载体诱导较低价态提高铜铁氧化物的类芬顿反应性能

铜和铁金属氧化物经常用作类芬顿催化剂,促进H 2 O 2分解产生·OH。然而,合成双金属铜铁催化剂通常需要显着的pH差异,导致金属在微观尺度上分散不均匀,限制了它们的协同效应。在本研究中,通过添加配体在水热过程中同时沉淀Fe 3+和Cu 2+构建了高度分散的双金属铜铁催化剂。此外,通过氧化gC 3 N 4作为载体,增强了活性催化组分的分散性,显着提高了类Fenton活性。氧化gC 3 N 4和双金属铜铁催化剂的表面电子转移以及铜和铁之间的协同作用促进了Cu 2+ /Cu +和Fe 3+ /Fe 2+的循环,从而可以90 分钟内降解 99.4% 的 500 mg/L 罗丹明 B。表征技术(XRD、BET、SEM、XPS 、Zeta 电位)证实了其优点:比表面积大、分散性高、存在低价金属。自由基猝灭实验和EPR表征表明·OH和1O 2是主要的活性氧化物质。Cu 2 Fe@OCN 在固定床实验中降解罗丹明 B显示出显着的稳定性和反应活性。

更新日期:2024-01-02
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