Ammonia is one of the main nitrogen pollutants in water, and a low concentration of ammonia in water is relatively difficult to remove. The catalytic system activating peroxymonosulfate (PMS) by the cobalt doped graphitic carbon nitride (Co-g-C₃N₄) was established for the oxidation of ammonia. The high removal efficiency of 98.3% for ammonia can be achieved, and total nitrogen removal efficiency was approximately 76.1% in the Co-g-C₃N₄/PMS/Cl process. Sulfate radical (SO₄^•−) was generated during the Co-g-C₃N₄/PMS process, reacting with chloride ions to produce chloride radical (Cl^•), which was identified as the main radical species for the transformation of ammonia to nitrogen gas. Moreover, Co-g-C₃N₄ had a good stability and can be recycled and reused owing to the Co-N bond. The results demonstrated the Co-g-C₃N₄/PMS/Cl process was an efficient and promising method for the removal of ammonia in chloride-containing wastewater under ambient conditions.

氨是水中主要的氮污染物之一，水中的氨浓度较低相对较难去除。建立了通过掺杂钴的石墨碳氮化物（Co-gC ₃ N ₄）活化过氧单硫酸盐（PMS）的催化体系，用于氨的氧化。可以实现98.3％的高去除率，在Co-gC ₃ N ₄ / PMS / Cl工艺中，总氮去除率约为76.1％。在Co-gC ₃ N ₄ / PMS过程中产生了硫酸根（SO ₄ ^•-），它与氯离子反应生成氯根（Cl ^•），这被认为是将氨转化为氮气的主要自由基种类。而且，Co-gC ₃ N ₄具有良好的稳定性，并且由于Co-N键而可以再循环和再利用。结果表明，Co-gC ₃ N ₄ / PMS / Cl工艺是一种在环境条件下去除含氯废水中氨的有效方法。