Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 88, Issue -, Pages 103-111Publisher
SCIENCE PRESS
DOI: 10.1016/j.jes.2019.07.008
Keywords
Nanozymes; Laccase; o-Phenylenediamine; Phenolic compounds; Magnetic nanoparticles
Categories
Funding
- National Natural Science Foundation of China [21878014]
- Beijing Municipal Natural Science Foundation [2182019]
- Beijing Natural Science Foundation-Beijing Municipal Education Commission Joint Funding project [KZ201710020014]
- Double First-rate Program [ylkxj03]
- Overseas Expertise Introduction Project for Discipline Innovation [B13005]
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In this study, we report a novel magnetic biomimetic nanozyme (Fe3O4@Cu/GMP (guanosine 5'-monophosphate)) with high laccase-like activity, which could oxidize toxic o-phenylenediamine (OPD) and remove phenolic compounds. The magnetic laccase-like nanozyme was readily obtained via complexed Cu2+ and GMP that grew on the surface of magnetic Fe3O4 nanoparticles. The prepared Fe3O4@Cu/GMP catalyst could be magnetically recycled for at least five cycles while still retaining above 70% activity. As a laccase mimic, Fe3O4@Cu/GMP had more activity and robust stability than natural laccase for the oxidization of OPD. Fe3O4@Cu/GMP retained about 90% residual activity at 90 degrees C and showed little change at pH 3-9, and the nanozyme kept its excellent activity after long-term storage. Meanwhile, Fe3O4@Cu/GMP had better activity for removing phenolic compounds, and the removal of naphthol was more than 95%. Consequently, the proposed Fe3O4@Cu/GMP nanozyme shows potential for use as a robust catalyst for applications in environmental remediation. (C) 2019 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
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