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

Donatos Manos,Foteini Papadopoulou,Antigoni Margellou,Dimitrios Petrakis,Ioannis Konstantinou

doi:10.3390/catal12020187

Donatos Manos, Foteini Papadopoulou + Show 3 more

Open Access

https://doi.org/10.3390/catal12020187

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Journal: Catalysts	Publication Date: Feb 2, 2022
Citations: 19	License type: CC BY 4.0

Affiliation: University of Ioannina

Abstract

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.

Highlights

Since water resources’ pollution is one of the major environmental problems in recent years, environmental and chemical technology is moving towards the development of novel and effective decontamination technologies [1]
We focus on the synthesis by the surfactant combustion method of a series of lanthanum-based perovskites with different metal ions in position B of the perovskite structure (LaMO3, M=Co, Fe, Cu, Mn, Ni)
For LaCoO3, LaNiO3, and LaCuO3, the diffractograms showed a diversity in the crystalline phases formed

Summary

Introduction

Since water resources’ pollution is one of the major environmental problems in recent years, environmental and chemical technology is moving towards the development of novel and effective decontamination technologies [1] This need lies in the fact that most emerging organic pollutants, such as pharmaceuticals, antibiotics, pesticides, etc., are resistant, toxic, and exhibit low biodegradability. As a result, it is practically difficult degrade them with conventional methods [2,3,4]. A wide variety of AOPs, such as electrochemical [6], photochemical [7], sonochemical [8], photocatalytic, and catalytic processes [9], can be used for the formation of ROS. These processes may differ both in the way in which ROS are formed as well as in the ROS formed

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