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Co3O4 particles are promising heterogeneous catalysts for peroxymonosulfate (PMS) activation; whereas they still surfer from the extensive agglomeration, serious Co leaching, poor electronic conductivity, and difficult recovery. Herein, a novel hybrid nanoarchitectonic constructed by encapsulating Co3O4 nanoparticles into continuous polypyrrole (PPy) nanotubes (Co3O4@PPy hybrids) was developed using electrospun fibers as the templates, which boosted the catalytic degradation toward tetracycline (TC). The continuous polypyrrole nanotubes could provide the confined spaces, offer effective electron transfer pathway, suppress cobalt ion loss, facilitate the oxygen vacancy (Ovac) formation, and accelerate the Co2+/Co3+ cycles. Co3O4@PPy hybrids thereby exhibited a remarkably enhanced catalytic activity with the TC degradation efficiency of 97.2% (kobs = 0.244 min−1) within 20 min and total organic carbon (TOC) removal rate of 66.8%. Furthermore, the recycle test, real natural water treatment, and fluidized-column catalytic experiments indicated the potential of Co3O4@PPy hybrids in the practical large-scale applications.
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