Abstract: Advanced oxidation technology based on persulfate had important potential value in treating antibiotic pollution. We  used MnSO₄,  MnCl₂  and Mn(NO₃)₂ as raw materials to prepare three kinds of MnO₂ by hydrothermal method. The prepared MnO₂ was characterized by an X-ray diffractometer (XRD),  scanning electron microscope (SEM)  and X-ray photoelectron spectroscopy (XPS). The effects of three kinds of MnO₂  catalysts on the removal of tetracycline (TC)  by peroxymonosulfate (PMS) were compared and analyzed, and  the catalytic mechanism was studied by quenching experiments. The results show that the MnO₂ prepared by MnSO₄ has a nanorod structure and the best catalytic effect on PMS. The removal rate of 50 mg/L TC is 56.8% within 60 min. There is an Mn(Ⅳ)/Mn(Ⅲ) cycle in the catalytic process,  and SO^-₄.,  .OH,  and ¹O₂ all contribute to the removal of TC. The MnO₂/PMS system has a high removal rate for  tetracycline when   pH>7,  10 mmol/L NO^-₃ and Cl^- have no affect on the  degradation efficiency of TC,  and 10 mmol/L HCO^-₃  can promote the  degradation of TC. The order of removal  of three tetracycline antibiotics by this method is  chlortetracycline>TC>oxytetracycline，  which  can be used for the treatment of antibiotic pollution.

Key words: manganese bioxide,  , peroxymonosulfate,  , advanced oxidation,  , tetracycline