In this study, calcite was investigated as an activator for the norfloxacin (NOR) degradation by peroxymonosulfate (PMS). Under optimum conditions, the NOR removal percentage was 99.7% within 60 min, and the pseudo-first-order kinetics effectively described the two-stage oxidation process. The NOR removal percentage improved from 10.4% to 91.5% and the reaction rate constant elevated from 0.0010 to 0.1217 min⁻¹ when 0.5 g/L calcite was added compared to that without calcite addition. Furthermore, the results of radical scavenger and electron spin resonance trapping indicated that the favorable alkaline environment and a proper level of carbonate in the Calcite/PMS system facilitated the activation of PMS to generate ¹O₂ for rapid NOR degradation. Compared with NaOH, calcite was able to maintain the pH (8–9) of the reaction system stable. Besides, the content of anions with buffering capacity and organic matter in the water matrix influenced the removal percentage of NOR. Seven intermediates were identified and the NOR degradation pathways were suggested. The findings of this research provided an environmentally friendly activator for remediation of organic wastewater and deepened the understanding of the interaction between calcium carbonate and PMS.

在这项研究中，方解石作为过氧单硫酸盐 (PMS) 降解诺氟沙星 (NOR) 的活化剂进行了研究。在最佳条件下，60 min 内 NOR 去除率为 99.7%，伪一级动力学有效地描述了两阶段氧化过程。与不添加方解石相比，添加 0.5 g/L 方解石时，NOR 去除率从 10.4% 提高到 91.5%，反应速率常数从 0.0010 提高到 0.1217 min ^-1。此外，自由基清除剂和电子自旋共振俘获的结果表明，方解石/PMS 体系中有利的碱性环境和适当水平的碳酸盐促进了 PMS 的活化生成¹ O ₂用于快速 NOR 降解。与NaOH相比，方解石能够保持反应体系的pH值（8-9）稳定。此外，水基质中具有缓冲能力的阴离子和有机物的含量影响了NOR的去除率。鉴定了七个中间体，并提出了 NOR 降解途径。该研究结果为有机废水的修复提供了一种环保活化剂，加深了对碳酸钙与PMS相互作用的理解。