Preferential catalytic ozonation of p-nitrophenol by molecularly imprinted Fe3O4/SiO2 core-shell magnetic composites

Abstract

Molecularly imprinted Fe3O4/SiO2 core-shell magnetic composites (Fe3O4/SiO2-MIP) were successfully prepared via anchoring p-nitrophenol (p-NP) imprinted functional polymers on the surface of amino-modified Fe3O4/SiO2 core-shell particles. Synthesized magnetic Fe3O4/SiO2-MIP composites were characterized by X-ray diffraction, scanning electronic microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, and magnetic property measurement. The preferential catalytic ozonation of p-nitrophenol was evaluated in comparison with the competitive reaction in the presence of coexistent phenol. The results showed that the prepared Fe3O4/SiO2-MIP composites exhibit strong adsorption ability due to the strong bonding between p-NP and the molecularly imprinted layer. The Fe3O4/SiO2-MIP demonstrated a preferential catalytic ozonation of p-NP by the recognition ability of the molecularly imprinted layer to the target p-NP. The enhanced catalytic activity using Fe3O4/SiO2-MIP composites could be attributed to the excellent recognition absorption of the MIP layer on the surface of Fe3O4/SiO2-MIP to p-NP.