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Indexed by:Journal Papers

Date of Publication:2020-07-23

Journal:CHEMISTRYSELECT

Included Journals:SCIE

Volume:5

Issue:27

Page Number:8284-8288

ISSN No.:2365-6549

Key Words:Heterogeneous catalysis; Imprinting; Fe3O4; Nanoparticles; Polypyrrole

Abstract:Nanozymes exhibit excellent enzyme-like activities but lack specificity. Here, molecularly imprinted polymers (MIPs) based on polypyrrole (PPy) and using methylene blue (MB) as template were grown on Fe(3)O(4)nanozymes to enhance the catalytic selectivity. The obtained composite Fe3O4@PPy MIPs were characterized using a scanning electron microscope, transmission electron microscope, powder X-ray diffractometer, and vibrating sample magnetometer. The PPy-encapsulated Fe(3)O(4)nanozymes retained their catalytic ability and almost completely removed MB within 30 min in the presence of sodium persulfate. In comparison with bare Fe(3)O(4)nanozymes, the Fe3O4@PPy MIPs showed superior catalytic selectivity for MB. The apparent rate constants (k(app)) for MB, rhodamine B, and methyl orange were 0.073, 0.035, and 0.012 min(-1), respectively. Even after five recycling steps, the obtained Fe3O4@PPy MIPs could degrade more than 80% of MB.