In order to improve the performance of the catalyst applied in ozonation, this work show the hydrothermal synthesis routine to prepare MnO 2 with different oxygen vacancy content. The α-MnO 2 was aminated and further processed with doped graphene oxide (GO) to obtain high oxygen vacancy content α-MnO 2 -NH 2 -GO, which was subsequently used for catalyzing ozonation phenol degradate. The catalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectra (XPS),

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... er (BET), H 2 -temperature-programmed reduction (H 2 -TPR), scanning electron microscopy (SEM), etc. Characterization and experimental results showed that the oxygen vacancy content has an important effect on the catalytic performance of the catalyst, MnO 2 with low average oxidation state showed better catalytic ozonation performance. The coexistence of Mn 3+ and Mn 4+ have great significant role for the continuous generation of free radicals and the restoration of oxygen vacancies. The doping of GO can increase the electron transfer rate, and improve the catalytic performance. The catalytic performance of α-MnO 2 -NH 2 -GO is better than α-MnO 2 , phenol removal rate can achieve more than 99% within 30 min, and superoxide radicals can be determined by different free radical trapping agents. The results of main active oxygen and reaction kinetics research showed that the degradation of phenol is a first-order reaction whether α-MnO 2 -NH 2 -GO or α-MnO 2 is used as a catalyst.