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In this work, magnetic CuFe 2 O 4 /Ag nanoparticles activated by porous covalent organic frameworks (COF) was fabricated to evaluate the heterogenous reduction of 4-nitrophenol (4-NP). The core-shell CuFe 2 O 4 /Ag@COF was successfully prepared by polydopamine reduction of silver ions on CuFe 2 O 4 nanoparticles, followed by COF layer condensation. By integrating the intrinsic characteristics of the magnetic CuFe 2 O 4 /Ag core and COF layer, the obtained nanocomposite exhibited features of high specific surface area (464.21 m 2 g -1 ), ordered mesoporous structure, strong environment stability, as well as fast magnetic response. Accordingly, the CuFe 2 O 4 /Ag@COF catalyst showed good affinity towards 4-NP via π-π stacking interactions and possessed enhanced catalytic activity compared with CuFe 2 O 4 /Ag and CuFe 2 O 4 @COF. The pseudo-first-order rate constant of CuFe 2 O 4 /Ag@COF (0.77 min -1 ) is 3 and 5 times higher than CuFe 2 O 4 /Ag and CuFe 2 O 4 @COF, respectively. The characteristics of bi-catalytic CuFe 2 O 4 /Ag and the porous COF shell of CuFe 2 O 4 /Ag@COF made a contribution to improve the activity of 4-NP reduction. The present work demonstrated a facile strategy to fabricate COF-activated nano-catalysts with enhanced performance in the fields of nitrophenolic wastewater treatment.

Covalent Organic Framework-Functionalized Magnetic CuFe2O4/Ag Nanoparticles for the Reduction of 4-Nitrophenol