Tailorable morphology control of Prussian blue analogues toward efficient peracetic acid activation for sulfonamides removal

Herein, the relationship between defined morphologies of Prussian blue analogues and their catalytic properties is comprehensively investigated. Solid Co-Fe-Cube and three different hollow morphologies (Box, Cage, and Frame) were successfully synthesized and exhibited distinct activation performance toward peracetic acid. The evolution of hollow interior led to partial disassociation of porous nanostructure, while Co-Fe-Cube with its solid cubic feature, high specific surface area (222.3 m2/g), and excellent stability (minimal leakage of metal ions) achieved the best removal efficiency (around 90 %) of six sulfonamides in 15 min. Organic radicals including CH3CO3• and CH3CO2• are identified to play the dominant role, and Co-Fe bimetal synergic effect induces the regeneration of highly active Co(II) sites. This work provides new insights into the structure-activity relationship and paves the way for precise structure control and property modulation of advanced catalysts in water decontamination.