Metal-organic frameworks-derived perovskite catalysts for efficient degradation of 2, 4-dichlorophenol via peroxymonosulfate activation

Abstract

Developing highly efficient and stable catalysts toward advanced oxidation technology is the key to achieve industrial peroxymonosulfate (PMS) activation for pollution degradation. Perovskite-type oxide catalysts show high activity and stability for PMS activation, yet the small specific surface area of perovskite catalysts limits the increase of catalytic performance. Metal-organic frameworks (MOFs) have been widely used as the templates/precursors to prepare high specific surface area nanomaterials. In this study, two kinds of high surface area perovskites LaCoO3 and LaMnO3 were firstly fabricated with MOFs as templates. Benefiting from the extraordinary skeleton structure of MOFs, well-defined architecture and porous perovskite catalysts show superior catalytic performance towards PMS activation for the degradation of 2, 4-dichlorophenol (2, 4-DCP), with a 99.8% degradation of 2, 4-DCP in 25 min for LaCoO3 catalyst. Moreover, the LaCoO3 catalysts exhibit long-term stability with a slight loss of catalytic activity during 3 times recycled experiments. This study not only developed high activity catalysts for PMS activation, but also expanded the MOFs applications for environment and energy.