P-cresol is a highly toxic phenolic pollutant in coal chemical wastewater. The effective removal of p-cresol is of great significance to the ecological environment. In this study, the degradation of p-cresol by the Fe(III)-EDDS/H₂O₂ Fenton-like reaction modified by Mn²⁺ was investigated. The results showed that the removal rate of p-cresol could be significantly increased by the addition of Mn²⁺ under neutral and weakly alkaline conditions (pH 6.5–8.5). Acidic conditions (pH 3.5) were not conducive to the Fenton-like reaction. This is because a neutral or weakly alkaline environment is conducive to Mn²⁺-EDDS complex formation, which can produce O₂^·- to accelerate the reduction of Fe(III), and the efficiency of p-cresol degradation through a Fenton-like reaction catalyzed by the Fe(III)-EDDS complex is significantly improved. In addition, the degradation of EDDS through ·OH was reduced by O₂^·-, which maintained and stabilized the Mn²⁺-EDDS complex and Fe(III)-EDDS complex. Under neutral conditions, the optimal dosage of Fe(III) is 0.7 mM, and the optimal molar ratios are EDDS/Fe(III) = 1: 1, Mn²⁺/Fe(III) = 1: 1, and H₂O₂/Fe(III) = 15: 1. The addition of free radical clearance isopropanol and CHCl₃ proved that ·OH was the main active substance in the p-cresol degradation process.

对甲酚是煤化工废水中的一种剧毒的酚类污染物。有效去除对甲酚对生态环境具有重要意义。在这项研究中，研究了由Mn ²⁺修饰的Fe（III）-EDDS / H ₂ O ₂ Fenton样反应对对甲酚的降解。结果表明，在中性和弱碱性条件下（pH 6.5-8.5），通过添加Mn ²⁺可以显着提高对甲酚的去除率。酸性条件（pH 3.5）不利于类芬顿反应。这是因为中性或弱碱性环境有利于Mn ²⁺ -EDDS络合物的形成，从而生成O ₂ ^·-加速Fe（III）的还原，并显着提高了通过Fe（III）-EDDS络合物催化的Fenton样反应对对甲酚的降解效率。此外，O ₂ ^·-减少了EDDS通过·OH的降解，从而维持并稳定了Mn ²⁺ -EDDS络合物和Fe（III）-EDDS络合物。在中性条件下，Fe（III）的最佳添加量为0.7 mM，最佳摩尔比为EDDS / Fe（III）= 1、1，Mn ²⁺ / Fe（III）= 1：1和H ₂ O ₂ / Fe（III）= 15：1.自由基清除率的异丙醇和CHCl _3的添加证明·OH是对甲酚降解过程中的主要活性物质。