This study explored the degradation of an iodine X-ray contrast media, iohexol, under heterogeneous ozone-catalyzed oxidation by adding Fe₃O₄ and 1-hydroxybenzotriazole (HBT). Results show that increasing the dosages of Fe₃O₄ catalyst and ozone as well as solution pH were beneficial to the degradation of iohexol. The presence of low background humic acid (HA) concentration (≤ 10 mg/L) promoted iohexol degradation, but high HA concentration (≥ 20 mg/L) inhibited it. Adding HBT exhibited a similar effect on iohexol degradation as HA. The degradation rate constant of iohexol was calculated as 0.07108 min^-1 in the Fe₃O₄/O₃/HBT process ([HBT] = 5 μM) at pH 7.0, which was approximately 1.5 times higher than that in the Fe₃O₄/O₃ process (0.04533 min^-1), and 4 times higher than that in the O₃ process (0.01742 min^-1). Fe₃O₄/O₃/HBT process was pH-dependent with high degradation efficiency of iohexol at pH 5 or 7. Singlet oxygen (¹O₂), hydroxyl radical ($\text{OH}\bullet$), and superoxide radical (${\text{O}}_{\text{2}}^{\text{-}}\bullet$) have been identified in the Fe₃O₄/O₃/HBT process, and the conversion of Fe²⁺ to Fe³⁺ was more obvious on the surface of Fe₃O₄ compared to that in the Fe₃O₄/O₃ process. Transformation intermediates were identified, and the degradation pathways of iohexol were proposed. Overall, Fe₃O₄/O₃ could enhance iohexol degradation compared with ozone-only system, and adding trace HBT in Fe₃O₄/O₃ system can further enhance heterogeneous ozone-catalyzed process for rapid organic matter degradation.

_{本研究通过添加 Fe 3} O ₄和 1-羟基苯并三唑 (HBT)探索了碘 X 射线造影剂碘海醇在非均相臭氧催化氧化下的降解。结果表明，增加Fe ₃ O ₄催化剂和臭氧的用量以及溶液pH值有利于碘海醇的降解。低背景腐植酸 (HA) 浓度 (≤ 10 mg/L) 的存在促进了碘海醇的降解，但高 HA 浓度 (≥ 20 mg/L) 抑制了它。添加 HBT 对碘海醇降解的影响与 HA 相似。在Fe ₃ O ₄ /O ₃中，碘海醇的降解速率常数计算为0.07108 min ^-1_{/HBT 工艺 ([HBT] = 5 μM) 在 pH 7.0 时，约为 Fe 3} O ₄ /O ₃工艺 (0.04533 min ^-1 )的 1.5 倍，是O ₃的 4 倍过程（0.01742 分钟^-1）。Fe ₃ O ₄ /O ₃ /HBT 过程具有 pH 依赖性，在 pH 5 或 7 时碘海醇的降解效率高。单线态氧 ( ¹ O ₂ )、羟基自由基 ($\text{哦}\bullet$) 和超氧自由基 (${\text{○}}_{\text{2}}^{\text{-}}\bullet$)在Fe ₃ O ₄ /O ₃ /HBT工艺中发现，与Fe ₃ O ₄ /O相比， Fe ₃ O ₄表面Fe ²⁺向Fe ^{3+的转化更为明显}₃过程。鉴定了转化中间体，并提出了碘海醇的降解途径。总体而言，与纯臭氧系统相比，Fe ₃ O ₄ /O _{3可以增强碘海醇降解，并且在 Fe 3} O ₄ /O _{3中添加微量 HBT}系统可以进一步增强非均相臭氧催化过程的快速有机物降​​解。