MOFs-based 0D-2D-3D nanoarchitectonics as catalytic converters for peroxymonosulfate activation

Abstract

Peroxymonosulfate-based advanced oxidation processes (PMS-AOPs) are promising trend for degrading of toxic organic pollutants. In this work, the novel 0D-2D-3D nanoarchitectonics (sandwich structure) are fabricated as advanced catalysts for PMS-AOPs. The distinctive sandwich structure of ZIF-67-AG-CA allows for the complete exposure of the active sites of ZIF-67, which can effectively activate PMS to generate both radical and non-radical species for the degradation of organic pollutants. Furthermore, the nano-reactive sites are distributed uniformly in layers, which provides additional PMS adsorption sites and enhances the efficiency of the catalytic reaction. Consequently, ZIF-67-AG-CA was observed to exhibit an excellent performance in the removal of organic pollutants by activating PMS, achieving a 99% degradation of 4-NP in 60 min and demonstrating good cycling stability through cycling experiments. Furthermore, quenching experiments and EPR demonstrated that SO₄²⁻ and O₂⁻ radicals were involved in a synergistic manner in the catalytic reaction process with ¹O₂ non-radicals during the catalytic process.