In this study, phosphite (HPO₃^2-) was used as a novel activator to activate peroxymonosulfate (PMS) for acid orange 7 (AO7) removal. Under the optimized conditions, the decolorization efficiency of AO7 was 82.1% within 60 min with rate constant values (k_obs) of 0.0301 min^-1. Besides, effects of the solution pH and the co-existing inorganic anions including Cl^-, HCO₃^–, HPO₄^2- and SO₄^2- on AO7 removal were also investigated. Except for SO₄^2-, other examined co-existing inorganic anions displayed favorable effects on the removal of AO7. Furthermore, the mechanism for PMS activation by the HPO₃^2- was deeply elucidated by radical scavenger including ethanol (EtOH), tert-butanol (TBA), L-histidine and tiron, and electron spin resonance (ESR) studies. It was proposed that singlet oxygen (¹O₂) would be the dominant reactive oxygen species (ROS) in the HPO₃^2-/PMS system for contamination degradation at neutral pH condition. The findings of this study provided useful information for the application of the substances in industrial wastewaters to activate PMS for organic contaminants degradation and in particular for HPO₃^2--rich electroplating wastewater treatment.

在这项研究中，亚磷酸酯（HPO ₃ ^2-）被用作新型活化剂来活化过氧单硫酸盐（PMS）以去除酸性橙7（AO7）。在最佳条件下，AO7的脱色效率在60分钟内为82.1％，速率常数值（k _obs）为0.0301 min ^-1。此外，溶液的pH值和共存的无机阴离子，包括氯的效果^-，HCO ₃ ^-，HPO ₄ ^2-和SO ₄ ^2-对AO7去除进行了研究。SO ₄ ^2-除外，其他检查的共存无机阴离子显示出对AO7去除的有利影响。此外，通过自由基清除剂，包括乙醇（EtOH），叔丁醇（TBA），L-组氨酸和亚铁和电子自旋共振（ESR）研究，深刻阐明了HPO ₃ ^2-激活PMS的机制。建议在中性pH条件下，单线态氧（¹ O ₂）是HPO ₃ ^2- / PMS系统中污染物降解的主要活性氧（ROS）。这项研究的发现为将这些物质应用于工业废水中以激活PMS降解有机污染物，特别是HPO ₃ ^2-提供了有用的信息。丰富的电镀废水处理。