期刊
CHEMICAL ENGINEERING JOURNAL
卷 450, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.138220
关键词
Ce-MOFs; Biomimetic nanozyme; Laccase; Mercaptan contaminants; Bisphenol A (BPA)
资金
- National Key Research and Development Program of China [2021YFC2102800]
- NationalNatural Science Foundation of China [22078111, 21878105, 21908070]
- Key Research and Development Program of Guangdong Province [2019B020213001]
This study demonstrates the design of multivalent cerium-based metal-organic frameworks as nanozymes, which mimic the active center and catalytic function of natural enzymes. These nanozymes show improved catalytic efficiency, stability, and recyclability, and have great potential for environmental catalysis.
Nanozyme has emerged as promising alternative to natural enzyme during recent years. Currently, laccase nanozyme is mainly limited to Cu-containing materials with catalytic Cu as active site. Noncopper laccase nanozyme, however, has not attracted extensive attention. Herein, inspired by multicopper active site and redox Cu2+/Cu+ electron transfer pathway of natural laccase, a range of multivalent cerium-based metal-organic frameworks (Ce-MOFs) with considerable laccase-mimicking activity were designed, where the internal cerium redox (Ce4+/Ce3+) reactivity could mimic the active center and catalytic function of natural laccase. Compared with natural laccase, Ce-UiO-66 and Ce-MOF-808 exhibited not only better catalytic efficiency (at identical mass concentration) but also superior stability and recyclability toward the oxidation of phenolic compounds. Accordingly, they were applied for detection of mercaptan contaminants and degradation of bisphenol A, showing great potential in environmental catalysis. This work provides new deep insights for rational design of advanced nanozymes and demonstrates the huge potential of applying nanozymes for environmental remediation.
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