The degradation of Orange II (Org II) by ferrous activated peroxymonosulfate (PMS) was inspected. The maximum degradation efficiency of 62.3% in 90 min occurred at 0.286 mM [PMS]₀, corresponding to 1:1 molar ratio of Fe²⁺: PMS. Results show that poor recovery of Fe²⁺ accounts for poor degradation in the slow stage. The species of reactive radicals were determined through indirect way by quenching agents, as well as directly by in situ EPR spin trapping tests. Results indicated that hydroxyl radicals instead of sulfate radicals were responsible for Org II degradation. The removal of Org II degradation would increase to 93.3% in 90 min as reaction temperature increased to 60 °C. The activation energy for PMS and Fe²⁺/PMS alone was calculated to be 77.2 kJ/mol and 34.7 kJ/mol, respectively. The removal efficiency of total organic carbon (TOC) was 11.0% and 43.8% when [Fe²⁺]₀:[PMS]₀:[Org II]₀ was 5:5:1 and 34:34:1, respectively. The main degradation products of Org II in system were supposed to be heterocyclic compounds containing a five-atom ring. Results demonstrated that Fe²⁺/PMS technology is promising technology for water pollution.

检查了亚铁活化过氧一硫酸盐（PMS）对Orange II（Org II）的降解。在0.286 mM [PMS] _0时，在90分钟内的最大降解效率为62.3％，相当于Fe ²⁺：PMS的摩尔比为1：1 。结果表明，Fe ^2+的回收率较差，导致缓慢阶段的降解较差。反应性自由基的种类通过淬灭剂间接测定，也可以通过原位EPR自旋阱测试直接测定。结果表明，羟基自由基而不是硫酸根自由基是造成Org II降解的原因。随着反应温度升高至60°C，在90分钟内Org II降解的去除率将提高至93.3％。PMS和Fe ²⁺的活化能单独的/ PMS分别计算为77.2 kJ / mol和34.7 kJ / mol。当[Fe ²⁺ ] ₀：[PMS] ₀：[Org II] ₀为5：5：1和34：34：1时，总有机碳（TOC）的去除效率分别为11.0％和43.8％。系统中Org II的主要降解产物被认为是含有五个原子环的杂环化合物。结果表明，Fe ²⁺ / PMS技术是有前途的水污染技术。