In this study, mixed metal cobalt zinc oxide embedded nitrogen enriched porous carbon composites (CoZnO-PC) were prepared via pyrolyzing polyvinylpyrrolidone (PVP) encapsulated Co, Zn-bimetal centered zeolitic imidazolate frameworks (ZIF). The prepared composites were then used to activate peroxymonosulfate (PMS) for bisphenol A (BPA) removal in water. When mole ratio of Co/Zn was 2/1, the resulted Co₂Zn₁O-PC possessed spinel structure with prominent degradation capability, in which the introduction of Zn accelerated the PMS activation performance of Co through establishing bimetal synergistic interactions. Both radical and non-radical activation pathways were existed in the Co₂Zn₁O-PC/PMS system, in which Co₂Zn₁O dominated the radical pathway whereas PC dominated the non-radical way. Since PVP contained abundant nitrogen atoms and could form strong coordination interactions with the ZIF precursor, the introduction of PVP in the ZIF precursor prevented pore collapsing during pyrolysis process, as well as enhancing the nitrogen content in the pyrolzed composites, which significantly promoted the generation of singlet oxygen. With combined pathways, the Co₂Zn₁O-PC/PMS system showed a wide pH application range with promising mineralization rate. Meanwhile, the spinel-structured Co₂Zn₁O-PC was magnetically separable with desirable recyclability. This study presents a novel composite with remarkable performance for the removal of refractory organic pollutants in municipal wastewater.

在这项研究中，通过热解聚乙烯吡咯烷酮 (PVP) 包封的 Co、Zn-双金属中心沸石咪唑酯骨架 (ZIF) 制备了混合金属钴锌氧化物嵌入富氮多孔碳复合材料 (CoZnO-PC)。然后将制备的复合材料用于活化过硫酸盐 (PMS) 以去除水中的双酚 A (BPA)。当 Co/Zn 摩尔比为 2/1 时，所得 Co ₂ Zn ₁ O-PC 具有尖晶石结构，具有显着的降解能力，其中 Zn 的引入通过建立双金属协同相互作用加速了 Co 的 PMS 活化性能。Co ₂ Zn ₁ O-PC/PMS体系中同时存在自由基和非自由基活化途径，其中Co ₂Zn ₁ O 支配自由基途径，而PC 支配非自由基途径。由于 PVP 含有丰富的氮原子并能与 ZIF 前驱体形成强配位相互作用，在 ZIF 前驱体中引入 PVP 防止了热解过程中的孔隙坍塌，并提高了热解复合材料中的氮含量，从而显着促进了单线态氧。通过组合途径，Co ₂ Zn ₁ O-PC/PMS 系统显示出广泛的 pH 应用范围和有希望的矿化率。同时，尖晶石结构的 Co ₂ Zn ₁O-PC 是磁性可分离的，具有理想的可回收性。本研究提出了一种具有显着性能的新型复合材料，用于去除城市废水中的难降解有机污染物。