Annular iron sheet (AIS), playing a dual role of anode electrode and source of activator, was combined with electrolysis technology for the activation of persulfate to improve the degradation of 2, 4-dinitrophenol (DNP) in aqueous solution. In this study, effects of current density (0–10.0 mA/cm²), persulfate (PS) dosage (0–8.0 mM), initial pH (3.0–11.0), reaction temperature (25–60 ^°C) and reaction time (0–30 min) on COD removal of DNP in aqueous solution were investigated, respectively. COD removal reached its maximal value (63.4%) after 15 min treatment due to the synergistic effect in electro/AIS/PS system under the optimal conditions. Furthermore, comparative studies of 7 different experimental processes were setup. In addition, the reasonable DNP degradation pathway was proposed based on intermediates detected by HPLC. According to characterization analysis of SEM-EDS, XRD and XPS of the generated flocculation in electro/AIS/PS system, the possible reaction mechanism was proposed in detail. In a word, the electrolysis process coupled with annular iron sheet as anode activating persulfate technology shows a significant synergetic effect in enhancing degradation of DNP in aqueous solution.

环形铁片（AIS），起着阳极电极和活化剂源的双重作用，与电解技术相结合以活化过硫酸盐，以改善水溶液中2,4-二硝基苯酚（DNP）的降解。在这项研究中，电流密度（0–10.0 mA / cm ²），过硫酸盐（PS）剂量（0–8.0 mM），初始pH（3.0–11.0），反应温度（25–60  ^°C）和COD去除水溶液中DNP的反应时间（0-30分钟）分别进行了研究。处理15分钟后，由于在最佳条件下电子/ AIS / PS系统中的协同作用，COD去除达到最大值（63.4％）。此外，建立了对7种不同实验过程的比较研究。此外，基于HPLC检测的中间体，提出了合理的DNP降解途径。通过对电/ AIS / PS系统中产生的絮凝物的SEM-EDS，XRD和XPS的表征分析，详细提出了可能的反应机理。简而言之，与环形铁片作为阳极活化过硫酸盐技术相结合的电解过程在增强水溶液中DNP的降解方面显示出显着的协同作用。