The present study focused on pulse dielectric barrier discharge (DBD) plasma activated persulfate (PS) for sulfamethoxazole (SMZ) degradation in water. The results showed that PS addition could enhance removal efficiency of SMZ in pulse DBD plasma system. The highest removal efficiency, kinetic constant and energy efficiency reached 93.4%, 0.084 min⁻¹ and 0.353 g/kWh respectively with the PS dosage of 40:1 and input power of 85 W. With increase of imput power and pulse frequency, the removal efficiency of SMZ was also increased. The removal efficiency was firstly enhanced and then declined as raising duty cycle and liquid flow rate. SMZ degradation was promoted in alkaline solution conditions. Active species including ·OH, e^-, ·O₂^–, ¹O₂ and ·SO- 4 play a certain role in the degradation of SMZ. The decline of O₃ and enhancement of ·OH and H₂O₂ were found after PS addition. In process of SMZ degradation, the overall conductivity increased but pH decreased. PS addition accelerated the removal of COD and TOC. The degradation process was explored by UV–Vis spectra, three-dimensional fluorescence and LC-MS. Three degradation pathways were deduced based on the indentified intermediates. SMZ degradation in the system was considered as a toxicity-attenuation process. The water matrix including Cl^-, HCO₃^–, SO₄^2- and HA have some impact on SMZ degradation. This study presented that pulse DBD plasma could activate PS efficiently, which finally improved pollutant removal efficiency and energy utilization.

本研究的重点是脉冲介质阻挡放电 (DBD) 等离子体活化过硫酸盐 (PS) 在水中降解磺胺甲恶唑 (SMZ)。结果表明，PS的加入可以提高脉冲DBD等离子体系统中SMZ的去除效率。在 PS 用量为 40:1、输入功率为 85 W 时，去除效率、动力学常数和能量效率分别达到 93.4%、0.084 min ^-1和 0.353 g/kWh。随着输入功率和脉冲频率的增加，去除SMZ的效率也提高了。去除效率随着占空比和液体流量的增加先提高后下降。在碱性溶液条件下促进SMZ降解。活性物质包括·OH、e ^-、·O ₂ ^–、¹ O ₂和·SO- 4 对SMZ的降解有一定的作用。添加PS后O ₃下降，·OH和H ₂ O _2增强。在SMZ降解过程中，总电导率增加，但pH值降低。PS 添加加速了 COD 和 TOC 的去除。通过紫外-可见光谱、三维荧光和 LC-MS 探索降解过程。根据鉴定的中间体推导出三种降解途径。系统中的 SMZ 降解被认为是一个毒性减弱过程。水基质包括 Cl ^- , HCO ₃ ^– , SO ₄ ^2-和 HA 对 SMZ 退化有一定的影响。本研究表明，脉冲 DBD 等离子体可以有效地激活 PS，最终提高污染物去除效率和能源利用率。