Developing high performance electrocatalysts for effective antibiotics elimination for heterogeneous electro-Fenton (Hetero-EF) process is still a challenge. This work synthesized iron/cobalt bimetallic N doped graphitic carbon cages (FeCo@NC) from ZIF-8@ZIF-67-Fe dual MOF composite for Cephalosporin C (CEP-C) degradation in the Hetero-EF system at a wide pH range. Results indicated that CEP-C degradation rate and total organic carbon (TOC) removal efficiency by FeCo@NC catalyst were as high as 82.45% (60 min) and 61.35% (240 min) at natural pH, respectively. The unique structure with FeCo bimetal encapsulated inside the N doped graphitic carbon cages enabled FeCo@NC to show excellent catalytic reactivity for HO activation. The generated M (•OH) and •OH all contributed to CEP-C degradation. The synergistic effects of Co/Co/Co and Fe/Fe/Fe cycles made FeCo@NC catalyst to continuously activate HO. Moreover, FeCo@NC catalyst showed good stability in consecutive cycles, and could still remain excellent reactivity when applied for CEP-C degradation from the real CEP-C fermentation residue supernatant. Furthermore, a possible CEP-C degradation pathway was proposed based on the identified intermediates.

中文翻译：

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在自然 pH 条件下使用碳笼中 MOF 衍生的 Fe-Co 双金属作为电芬顿催化剂降解头孢菌素 C


开发高性能电催化剂以有效消除多相电芬顿（Hetero-EF）过程中的抗生素仍然是一个挑战。这项工作从 ZIF-8@ZIF-67-Fe 双 MOF 复合材料合成了铁/钴双金属氮掺杂石墨碳笼 (FeCo@NC)，用于在宽 pH 范围内的 Hetero-EF 系统中降解头孢菌素 C (CEP-C) 。结果表明，在自然 pH 条件下，FeCo@NC 催化剂对 CEP-C 的降解率和总有机碳 (TOC) 去除率分别高达 82.45%（60 分钟）和 61.35%（240 分钟）。 FeCo双金属封装在氮掺杂石墨碳笼内的独特结构使FeCo@NC表现出优异的H2O活化催化反应活性。生成的M(•OH)和•OH均导致CEP-C降解。 Co/Co/Co和Fe/Fe/Fe循环的协同效应使得FeCo@NC催化剂能够持续活化H2O。此外，FeCo@NC催化剂在连续循环中表现出良好的稳定性，并且当应用于真实CEP-C发酵残渣上清液中的CEP-C降解时仍能保持优异的反应活性。此外，根据已确定的中间体，提出了可能的 CEP-C 降解途径。