Bimetallic Fe- and Mo-embedded N-enriched porous biochar (Fe-Mo@N-BC) is developed and serves as a cost-effective and highly efficient catalyst for mineralization of non-biodegradation organic contaminants. Fe-Mo@N-BC was prepared by pyrolysis of complex Fe/Mo -containing precursors. Transmission electron microscopy and elemental mapping suggested that Fe and Mo are uniformly dispersed in nitrogen-doped biochar with hierarchical mesopores. In comparison to Fe@N-BC and Mo@N-BC, Fe-Mo@N-BC exhibited a superior activity for activating peroxymonosulfate (PMS). The stable activity was ascribed to N-doping and synergistic effect of Fe and Mo species, where both Fe-N_x and Mo-N_x can simultaneously serve as the active sites and N-BC can act as a carrier and an activator as well as an electron mediator. Electron paramagnetic resonance and quenching experiments indicated that $H{O}^{•}$, ${\mathrm{O}}_{\mathrm{2}}^{•-}$ and ¹O₂ were responsible for organic degradation. The effects of PMS dosage, initial Orange II concentration, temperature, solution pH, coexisting anions and humic acids on organic degradation were also investigated. With the assistance of an external magnet, Fe-Mo@N-BC can be easily separated after reaction and remains stable in the reusability tests. This work demonstrates a feasible strategy towards the fabrication of Fe, Mo-embedded N-enriched porous biochar catalysts for the detoxification of organic contaminants.

开发了双金属 Fe 和 Mo 嵌入的富氮多孔生物炭 (Fe-Mo@N-BC)，可用作非生物降解有机污染物矿化的经济高效的催化剂。Fe-Mo@N-BC 是通过复合含 Fe/Mo 前驱体的热解制备的。透射电子显微镜和元素映射表明 Fe 和 Mo 均匀分散在具有分级介孔的氮掺杂生物炭中。与 Fe@N-BC 和 Mo@N-BC 相比，Fe-Mo@N-BC 表现出更好的活化过硫酸盐 (PMS) 的活性。稳定的活性归因于 N 掺杂和 Fe 和 Mo 物种的协同作用，其中 Fe-N _x和 Mo-N _x可以同时作为活性位点，N-BC 可以作为载体和活化剂以及电子介体。电子顺磁共振和猝灭实验表明$H{哦}^{•}$, ${\mathrm{哦}}_{\mathrm{2}}^{•-}$和¹ O ₂负责有机降解。还研究了 PMS 剂量、初始橙 II 浓度、温度、溶液 pH 值、共存阴离子和腐殖酸对有机降解的影响。在外部磁铁的帮助下，Fe-Mo@N-BC 可以在反应后轻松分离，并在可重复使用性测试中保持稳定。这项工作展示了一种制备 Fe、Mo 嵌入的富氮多孔生物炭催化剂用于有机污染物解毒的可行策略。