The activation of sulfite by heterogeneous catalysts displays a great potential in the development of new sulfate radials based technologies for wastewater treatment. Herein, cobalt nanoparticles embedded in N-doped carbon nanotubes (Co@NC) were prepared by a simple pyrolysis method. Due to the synergistic effects of the cobalt nanoparticles and N-doped carbon nanotubes, the Co@NC catalyst intrinsically shows an outstanding efficiency, excellent reusability and high stability in the catalytic oxidation of methyl orange (MO) in the presence of sulfite and dioxygen. The structure and efficiency of the catalyst was significantly affected by the content of cobalt and pyrolysis temperature. Several quenching experiments and electron paramagnetic resonance were carried out to investigate the catalytic mechanism. It is found that hydroxyl and sulfate radicals worked together to degrade MO in the system. The formation and decomposition of peroxymonosulfate may be an important route of these reactive radicals production. The effect of different anions, bicarbonate concentration, initial solution pH and dye types on the performance of the catalyst was also studied. This study can open a new approach for design and preparation of encapsulated cobalt in carbon materials as effective catalysts for pollutants degradation via sulfite activation.

非均相催化剂对亚硫酸盐的活化在基于硫酸盐放射线的废水处理新技术的开发中显示出巨大的潜力。在此，通过简单的热解方法制备了嵌入N掺杂的碳纳米管（Co @ NC）中的钴纳米颗粒。由于钴纳米颗粒和N掺杂碳纳米管的协同作用，Co @ NC催化剂在存在亚硫酸盐和双氧的条件下，在甲基橙（MO）的催化氧化中本质上显示出出色的效率，出色的可重用性和高稳定性。钴的含量和热解温度显着影响催化剂的结构和效率。进行了几次猝灭实验和顺磁共振电子研究了其催化机理。发现羟基和硫酸根自由基共同作用以降解系统中的MO。过氧单硫酸盐的形成和分解可能是这些反应性自由基产生的重要途径。还研究了不同阴离子，碳酸氢根浓度，初始溶液pH和染料类型对催化剂性能的影响。这项研究可以为碳材料中封装钴的设计和制备提供一种新方法，作为有效的催化剂，通过亚硫酸盐活化来降解污染物。