Calcium peroxide (CaO₂) is a stable hydrogen peroxide (H₂O₂) carrier, and the CaO₂/Fe(II) system has been applied for treatment of various pollutants. It is commonly reported in the literature that hydroxyl radical (HO) and superoxide radical anions (O₂⁻) are the two main reactive oxygen species (ROSs) generated in the CaO₂/Fe(II) system. However, many of the reported results were deduced from degradation performance rather than specific testing of radical generation. Thus, the specific generation of ROSs and the influence of system conditions on ROSs yield are still unclear. To our knowledge, this is the first study specifically focusing on the generation of HO and O₂⁻ in the CaO₂/Fe(II) system. Experimental conditions were optimized to investigate the production of HO and O₂⁻. The results showed the influences of CaO₂, Fe(II), and solution pH on HO and O₂⁻ generation, and the HO generation efficiency was reported for the first time. In addition, the ROSs generation pathways in the CaO₂/Fe(II) system were elucidated. A strategy for enhancing HO yield is developed, based on the continuously dosing Fe(II). This proposed strategy has implications for the effective application of in situ chemical oxidation employing CaO₂/Fe(II) for groundwater remediation.

过氧化钙（CaO ₂）是稳定的过氧化氢（H ₂ O ₂）载体，并且CaO ₂ / Fe（II）系统已用于处理各种污染物。它是在文献中通常报道了羟基自由基（HO ）和超氧阴离子自由基（O ₂ ^- ）是在中的CaO生成的两个主要的活性氧物种（ROSS）₂/ Fe（II）系统。但是，许多报道的结果是由降解性能推论得出的，而不是由自由基生成的具体测试得出的。因此，尚不清楚ROS的具体生成方式和系统条件对ROS产量的影响。据我们所知，这是第一个专门研究侧重于HO的产生和O ₂ ^-下CaO ₂ /铁（II）系统。实验条件进行了优化，调查生产的HO和O ₂ ^- 。结果表明：CaO的影响₂，铁（II），以及溶液的pH值上HO和O ₂ ^-的生成，和HO首次报道了发电效率。此外，阐明了CaO ₂ / Fe（II）系统中的ROSs生成途径。基于连续投料的Fe（II），开发了一种提高HO收率的策略。该拟议的策略对利用CaO ₂ / Fe（II）进行地下水修复的原位化学氧化的有效应用具有重要意义。