Abstract
Heterogeneous electro-Fenton (HEF) processes are potential pathways for aquatic contaminants removal. However, synergies from catalysts dense accumulation, the sluggish inner diffusion and the loss of active sites inside the catalyst, have limited the practical application of traditional monolithic cathodes. In this work, it has been proofed that the highly controlled porosity in 3D-printed ordered framework shows obvious diffusion enhancement and offers more active sites. The stable and efficient HEF catalysts guarantee the removal and mineralization of aqueous pesticides. H2O2 is effectively generated in situ via 2-electron oxygen reduction reaction by the carbon lattice in the pH range of 4–10, which is then activated into hydroxyl radicals by the encapsulated Fe2P/Fe in 3D printed cathodes. Estimated by the mass-transfer simulation, the Grid structure has the largest convective transport velocity of 8 × 10-5 m∙s-1, which optimizing mass-transfer effect and maximizing the active sites utilization. Grid-2 % achieves 3.54 ± 0.05 mg∙g-1 napropamide degradation at neutral condition in one hour, which is 82 % and 269 % higher than degradation obtained by Star-2 % and Diamond-2 %, respectively.
Published Version
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