This study investigated sulfamethazine (SMT) ultrasound degradation, enhanced by iodine radicals, generated by potassium iodide (KI) and hydrogen peroxide (H₂O₂) in situ. The results showed that the ultrasound/H₂O₂/KI (US/H₂O₂/KI) combination treatment achieved an 85.10±0.45% SMT removal (%) in 60 min under the following conditions: pH = 3.2, ultrasound power of 195 W, initial SMT concentration of 0.04 mmol·L^-1, H₂O₂ concentration of 120 mmol·L^-1, and KI concentration of 2.4 mmol·L^-1. UV-Vis spectrophotometric monitoring of molecular iodine (I₂) and triiodide (I₃^-) revealed a correlation between the SMT degradation and the iodine change in the solution. Quenching experiments using methanol, t-butanol and thiamazole as radical scavengers indicated that iodine radicals, such as I· and I₂^-·, were more important than hydroxyl radicals (HO·) for SMT degradation. SMT degradation under the US/H₂O₂/KI treatment followed pseudo-first order reaction kinetics. The activation energy (E_a) of SMT degradation was 7.75±0.61 kJ·mol^-1, which suggested the reaction was controlled by the diffusion step. Moreover, TOC removal was monitored, and the obtained results revealed that it was not as effective as SMT degradation under the US/H₂O₂/KI system.

这项研究调查了原位碘化钾（KI）和过氧化氢（H ₂ O ₂）产生的碘自由基增强的磺胺二甲嘧啶（SMT）超声降解。结果表明，在以下条件下，超声/ H ₂ O ₂ / KI（US / H ₂ O ₂ / KI）联合处理在60分钟内达到了85.10±0.45％的SMT去除率（％）：pH = 3.2，超声功率195 W的电势，初始SMT浓度为0.04mmol·L ^-1，H ₂ O ₂浓度为120mmol·L ^-1，KI浓度为2.4mmol·L ^-1。紫外-可见分光光度法监测分子碘（I的₂）和三碘化物（I ₃ ^- ）揭示了SMT退化和在溶液中的碘变化之间的相关性。淬火使用甲醇的实验中，吨丁醇和甲巯咪唑作为自由基清除剂表明碘基团，如I·和我₂ ^- ·，较羟基自由基更重要（HO·），用于SMT降解。在US / H ₂ O ₂ / KI处理下，SMT降解遵循拟一级反应动力学。SMT降解的活化能（E _a）为7.75±0.61 kJ·mol ^-1，这表明反应是由扩散步骤控制的。而且，监测了TOC的去除，并且获得的结果表明，在US / H ₂ O ₂ / KI系统下，TOC的去除效果不如SMT降解。