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Meeting the escalating demand for clean water resources is one of the key challenges to ensure a sustainable future. Catalysis plays an important role to advance the chemical reactions required for wastewater efficient remediation. How to exploit high‐performance catalysts to boost the pivotal reaction kinetics always attracts researchers' enthusiasm. Perovskite oxides as a novel class of functional materials can be tuned to confer compositional flexibilities and provide rich and unique structural properties. As the rising‐star material, it has been widely probed for electrocatalysis, photocatalysis, and membrane‐catalysis for energy conversion, but received less attention in water treatment. In this review, the advances of perovskite oxides for advanced oxidation processes (AOPs) in water remediation are comprehensively elaborated. A fundamental understanding of the crystal structures and properties of perovskite oxides as well as the basic principles of AOPs is firstly provided. Then, emphasis is placed on how to tune the perovskite oxides to suit various AOPs. The strategies to design novel perovskite oxides to enhance the catalytic activities in AOPs have been highlighted. It is expected that after reading this review, readers will have a clearer vision of the background, the state of the art development, and general guidelines for future directions regarding research in this area. [ABSTRACT FROM AUTHOR]

Cost‐effective, stable, and highly efficient heterogeneous catalyst is the key challenge for wastewater treatment based on Fenton‐like advanced oxidation processes. Perovskite oxides offer new opportunities because of their versatile compositions and flexible physiochemical properties. Herein, a new strategy is proposed that is different from the frequently used alien‐metal doping, to tune surface properties of perovskite oxides by nanocompositing perovskite with inert oxide, resulting in improved activity and stability for catalytic oxidation. By in situ modification of LaFeO3 with inert La2O3 oxide through one‐pot synthesis, several important surface properties such as surface defects, H2O2 adsorption capacity, Fe2+ concentration, and charge‐transfer rate were improved, as well as resistance against iron leaching. In performance evaluation, among the various materials, La1.15FeO3 (L1.15FO) composite shows the highest Fenton activity (0.0402 min−1) for activating H2O2 to oxidize methyl orange, 2.5 times that of the pristine LaFeO3. Notably, in situ electron paramagnetic resonance analysis and radical scavenging tests unveil a faster generation of singlet oxygen as the dominant reactive species over L1.15FO, consequently a novel non‐radical activation mechanism is proposed. Such improved performance is assigned to the strong coupling effect between the nanosized LaFeO3 and La2O3 in the hybrids, which fine‐tune the surface properties of LaFeO3 perovskite as superior Fenton catalysts. Fine‐tuning surface properties and structure of perovskites via nanocompositing with inert oxide toward developing superior catalysts for advanced oxidation. [ABSTRACT FROM AUTHOR]