A review on the application of perovskite catalysts for sulfate radical-based advanced oxidation processes

Abstract

In today’s increasingly serious problem of emerging contaminants (ECs), sulfate radical-based advanced oxidation processes (SR-AOPs) have become one of the options for deep wastewater purification and water remediation. The heterogeneous activation of persulfate without external energy is of great significance. However, how to choose a suitable persulfate activation method to meet the practical requirements is an urgent problem to be solved. Perovskite-based catalysts have been widely used in SR-AOPs because of their advantages such as low cost, high catalytic activity, variety and tunable structures. In this paper, the history, structure and preparation method of perovskite are introduced. Next is the design of perovskite catalyst, include the selection of elements, modification methods and preparation of perovskite-based composites. The synergistic effect of generating oxygen vacancies (OVs) through cation substitution and utilizing bimetallic oxides is a common method in the field of perovskite-mediated SR-AOPs. Finally, the shortcomings and future development direction of this field are discussed. This work helps researchers and practitioners to better select and design perovskite catalysts and perovskite-based composites.