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Water-soluble organic pollutants, such as phenolic compounds, have been exposed to environments globally. They have a significant impact on groundwater and surface water quality. In this work, different Mn₃O₄ catalysts were prepared for metal oxide activation of peroxymonosulfate (PMS) to remove the phenolic compound from the water environment. The as-prepared catalysts were characterized using thermogravimetric-differential thermal analysis (TG-DTA), powder X-ray diffraction (XRD), scanning electron microscopy (SEM), and Brunauer-Emmett-Teller (BET) surface area analysis. Furthermore, the effect of temperature and reusability of the as-prepared Mn₃O₄ catalysts is also investigated. The Mn₃O₄ nanoparticles (NPs) catalyst reveals an excellent performance for activating PMS to remove phenol compounds. Mn₃O₄ NPs exhibits 96.057% efficiency in removing 25 ppm within 60 min. The kinetic analysis shows that Mn₃O₄ NPs fitted into pseudo-first order kinetic model and exhibited relatively low energy activation of 42.6 kJ/mol. The reusability test of Mn₃O₄ NPs displays exceptional stability with 84.29% efficiency after three-sequential cycles. The as-prepared Mn₃O₄ NPs is proven suitable for phenolic remediation in aqueous solutions.