期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 425, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.127763
关键词
laccase mimic; iron single-atom catalyst; nanozyme; N-doped carbon; phenolic compounds
资金
- National Natural Science Foundation of China [32001266]
- National Key Research and Development Project [2021YFC2100100]
A novel nitrogen-doped carbon material Fe1@CN20 was developed as a laccase mimic, offering better stability and recyclability, and showing more sensitive performance in the detection and degradation of phenolic compounds.
To solve the inherent defects of laccase, the first iron single-atom anchored N-doped carbon material (Fe1@CN20) as a laccase mimic was disclosed. The FeN4 structure of this material can well mimic the catalytic activity of laccase. Although Fe1@CN-20 has a lower metal content (2.9 wt%) than any previously reported laccase mimics, it exhibits kinetic constants comparable to those of laccase, as its Km (Michaelis constant) and Vmax (maximum rate) are 0.070 mM and 2.25 mu M/min respectively, which are similar to those of laccase (0.078 mM, 2.49 mu M/ min). This catalyst displays excellent stability even under extreme pH (2-9), high temperature (100 degrees C), strong ionic strength (500 mM of NaCl), high ethanol concentration (volume ratio 40%) and long storage time (2 months). Additionally, it can be reused for at least 7 times with only a slight loss in activity. Therefore, this material has a much lower price and better stability and recyclability than laccase, which has been applied in the detection and degradation of a series of phenolic compounds. In the detection of adrenaline, Fe1@CN-20 achieved a detection limit of 1.3 mu M, indicating it is more sensitive than laccase (3.9 mu M).
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