4-chlorophenol (4-CP) is one of the most important phenolic compounds in various industries. Different technologies have been applied for 4-CP degradation in aquatic environment. Current study is focused on 4-CP degradation by the combination of UV and MnO₂ for peroxymonosulfate (PMS) activation to degrade 4-CP. MnO₂ nanoparticles were synthesized and characterized by X-ray powder diffraction, field emission scanning electron microscope, energy-dispersive X-ray spectroscopy and Brunauer–Emmett–Teller (BET). The effects of operational parameters were evaluated and their results indicated the highest performance in pH=4.0, 1 mM PMS and 0.25g/L MnO₂. Complete degradation of 4-CP during 30 min was a representative of high performance of UV/MnO₂/PMS. Kinetic study showed that the co-activation of PMS by MnO₂ and UV had a synergistic effect on 4-CP degradation. MnO₂ could keep its performance at least 4th cycle while Mn leaching was negligible. Bicarbonate and hydrogen phosphate ions suppressed the performance of the process in degradation of 4-CP whereas no change was observed in the presence of chloride ions. Quenching experiments showed that hydroxyl radical was dominant radical for 4-CP degradation. The results of toxicity and biodegradability tests indicated that treated sample by UV/MnO₂/PMS process was relatively non-toxic and easy biodegradable. The function of UV/MnO₂/PMS system for treatment of real industrial wastewaters (pharmaceutical and petrochemical wastewaters) was tested. Finally, it was concluded that hybrid activation of PMS can be a new perspective for PMS-based processes to treat industrial wastewater.

4-氯苯酚（4-CP）是各个行业中最重要的酚类化合物之一。在水生环境中，已将不同的技术应用于4-CP降解。当前的研究集中在通过UV和MnO ₂的结合来过氧化一硫酸盐（PMS）活化降解4-CP的4-CP降解。合成了MnO ₂纳米颗粒，并通过X射线粉末衍射，场发射扫描电子显微镜，能量色散X射线光谱和Brunauer-Emmett-Teller（BET）进行了表征。评估了操作参数的影响，结果表明在pH = 4.0、1 mM PMS和0.25g / L MnO _2时性能最高。在30分钟内4-CP的完全降解代表了UV / MnO _2的高性能/ PMS。动力学研究表明，MnO ₂和紫外线共同激活PMS对4-CP降解具有协同作用。MnO ₂可以保持其性能至少第4个循环，而Mn的浸出可以忽略不计。碳酸氢根和磷酸氢根离子抑制了4-CP降解过程的性能，而在存在氯离子的情况下未观察到变化。淬火实验表明，羟基自由基是4-CP降解的主要自由基。毒性和生物降解性测试结果表明，经UV / MnO ₂ / PMS处理的样品相对无毒且易于生物降解。UV / MnO ₂的功能测试了用于处理实际工业废水（制药和石化废水）的/ PMS系统。最后，得出的结论是，PMS的混合活化可以成为基于PMS的工业废水处理过程的新视角。