Heterojunctions engineered electron‐deficient Co/oxygen vacancy‐rich MnO 2 triggers local built‐in electric field within porous carbon fiber for PMS activation and rapid pollutant degradation

作者：Zhenxiao Wang, Shuguang Ning, Xiang Liu, Hongyao Zhao, Wanyu Zhang, Liying Cao, Yanyun Wang, Danhong Shang, Linzhi Zhai, Tongyi Yang, Feng Zeng, Yangping Zhang, Fu Yang · 发表于：Rare Metals · 年份：2025 · DOI：10.1007/s12598-025-03415-7 · 被引用次数：21 · 研究领域：Supercapacitor Materials and Fabrication、Advanced Photocatalysis Techniques、Carbon and Quantum Dots Applications

Abstract The advanced oxidation process presents a perfect solution for eliminating organic pollutants in water resources, and the local microenvironment and surface state of metal reactive sites are crucial for the selective activation of peroxomonosulfate (PMS), which possibly determines the degradation pathways of organic contaminants. In this study, by virtue of the precursor alternation, we constructed the state‐switched dual metal species with the porous carbon fibers through the electrospinning strategy. Impressively, the optimal catalyst, featuring the electron‐deficient cobalt surface oxidative state and most abundant oxygen vacancies (Ov) with MnO 2 within porous carbon fibers, provides abundant mesoporosity, facilitating the diffusion and accommodation of big carbamazepine molecules during the reaction process. Benefiting from the tandem configuration of carbon fiber‐encapsulated nanocrystalline species, a p–n heterojunction configuration evidenced by Mott–Schottky analysis induced local built‐in electric field (BIEF) between electron‐deficient cobalt and Ov‐rich MnO 2 within carbon matrix‐mediated interfacial interactions, which optimizes the adsorption and activation of PMS and intermediates, increases the concentration of reactive radicals around the active site, and significantly enhances the degradation performance. As a result, the optimal catalyst could achieve 100% degradation of 20 ppm carbamazepine (CBZ) within only 4 min with a rate constant of 1.099 min...