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Fabrication and Application of Magnetically Catalytic Imprinting Nanozymes
Author(s) -
Hu Yufeng,
Liu Jie,
Xing Hanwen,
Zhou Hao,
Wu Minghuo
Publication year - 2020
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202000900
Subject(s) - catalysis , polypyrrole , selectivity , diffractometer , scanning electron microscope , transmission electron microscopy , chemistry , molecular imprinting , rhodamine b , nuclear chemistry , materials science , polymer , chemical engineering , nanotechnology , polymerization , organic chemistry , photocatalysis , engineering , composite material
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 Fe 3 O 4 @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 Fe 3 O 4 @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 Fe 3 O 4 @PPy MIPs could degrade more than 80% of MB.