Heterogeneous Activation of Persulfate by LaMO3 (M=Co, Fe, Cu, Mn, Ni) Perovskite Catalysts for the Degradation of Organic Compounds

Sulfate radical-based advanced oxidation processes (SR-AOPs) are lately applied for the degradation of various pollutants through the formation of reactive oxidant species (ROS) from activation of oxidants, such as persulfate (PS) or peroxymonosulfate (PMS). In this study, LaMO3 (M=Co, Fe, Cu, Mn, Ni) perovskite catalysts were synthesized, characterized by several techniques, and tested for the activation of persulfate towards the degradation of phenolic pollutants. The effect of substitution of position B of La-based perovskites as well as calcination temperature was studied. Overall, the results showed that the decisive role in the catalytic activity was the presence of structures that enhance the transfer of electrons between perovskite and oxidant. LaNiO3 followed by LaCoO3 were found as the most active catalysts. Finally, the stability of the catalysts was studied, showing that B-metal leaching is significant for both catalysts, with LaCoO3 being the most stable one.

Automated summary

Sulfate radical-based advanced oxidation processes (SR-AOPs) have been used for degrading pollutants by generating reactive oxidant species (ROS) through the activation of oxidants. In this study, a series of LaMO3 (M=Co, Fe, Cu, Mn, Ni) perovskite catalysts were synthesized and tested for their activity in activating persulfate for the degradation of phenolic pollutants. The results showed that the catalytic activity depended on the structure facilitating electron transfer between the perovskite and oxidant, with LaNiO3 and LaCoO3 as the most active catalysts.