In this study, Co/N co-doped polyhedron carbonaceous catalyst (Co@N-C-2) with abundant mesoporous, high graphitization degree and cobalt content was synthesized via the pyrolysis of core–shell MOFs composite (ZIF-8@ZIF-67). The two cobalt species (Co NPs and Co-N_x) coexisted in Co@N-C-2 were unveiled to play different role in PMS activation. Concretely, the Co-N_x served as active sites for ¹O₂ evolution pathway, while Co NPs greatly improved the graphitization degree and thus enhanced the electron transfer pathway. Owing to the novel structure, the as-prepared Co@N-C-2 presented superior catalytic performance upon PMS activation for the removal of several organic pollutants in comparison with the catalysts derived from single MOFs (ZIF-8 and ZIF-67) and the transition metal oxides. Moreover, Co@N-C-2 could be recovered by thermal treatment, and the Co@N-C-2/PMS system also showed high resistance to inorganic anions and natural organic matter (NOM). This study reveals the crucial role of cobalt species in regulating the structure of catalyst and determining the PMS activation pathway.

在这项研究中，通过核-壳MOFs复合物（ZIF-8 @ ZIF-67）的热解合成了具有丰富的介孔，高石墨化度和钴含量的Co / N共掺杂多面体碳质催化剂（Co @ NC-2）。 。揭示了在Co @ NC-2中共存的两种钴物种（Co NP和Co-N _x）在PMS激活中起着不同的作用。具体而言，Co-N _x用作¹ O _2的活性位点碳纳米管的演化途径，而钴纳米颗粒大大提高了石墨化程度，从而增强了电子传递途径。由于具有新颖的结构，与单一MOF（ZIF-8和ZIF-67）和过渡MOF衍生的催化剂相比，所制备的Co @ NC-2在PMS活化后具有优异的催化性能，可去除多种有机污染物。金属氧化物。而且，可以通过热处理回收Co @ NC-2，并且Co @ NC-2 / PMS系统还显示出对无机阴离子和天然有机物（NOM）的高耐受性。这项研究揭示了钴物种在调节催化剂结构和确定PMS活化途径中的关键作用。