CoSn(OH) nanocubes: Hydroxyl perovskite catalyst for efficient peroxymonosulfate activation in acetamiprid degradation.

This study presents the synthesis of a nano-cubic metal hydroxide with a perovskite structure, CoSn(OH), for the efficient activation of peroxymonosulfate (PMS) towards the degradation of acetamiprid (ACE) in water treatment. The CoSn(OH)/PMS system achieved complete degradation of ACE within only 12 min and exhibited outstanding catalytic stability. Our findings indicate that the non-radical mechanism, featuring singlet oxygen (O) and Co(IV)=O, is the primary contributor to the degradation process, while the role of radical species such as sulfate radical (SO) and hydroxyl radicals (·OH) is subordinate. These insights were confirmed through trapping experiments, electron paramagnetic resonance (EPR), in situ Raman spectroscopy and steady-state model. This work offers novel perspectives on the application of cobalt-based hydroxide catalysts in PMS activation for the remediation of emerging contaminants in water.