Interfacial Oxygen Vacancy of CuOx‐CeO2 Enhances H2O2 Activation and Pollutant Degradation

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In the Fenton process, the development of catalysts with a wide pH range and good stability has been a long‐term goal for water treatment purpose. This study proposes a strategy to solve this problem by preparing supported catalysts CuOx@CeO2‐IE using an ion exchange reversed loading method. The generation of a large number of interfacial oxygen vacancies with Cu‐OV‐Ce (OV represents an oxygen vacancy site) structures prolongs the O−O bond of H2O2, promotes the rupture of the peroxide bond of H2O2, and thereby promotes the activation of H2O2 on the surface of the catalyst. The results show that with a H2O2 concentration of 5 mM and CuOx@CeO2‐IE at 50 mg/L, the removal rate of bisphenol A is 94.1 % in 60 min, in which • OH dominates the degradation process. Moreover, the system can operate well within a relatively wide pH range (4–8). This study provides a novel strategy for the design of Fenton catalysts with a wide pH suitability and excellent stability.