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Modulating ion migration realizes both enhanced and long-term-stable nanozyme activity for efficient microplastic

Pingping Wan1, Guanghui Chen1, Jinsong Fan1

  • 1State Key Laboratory of Chemo and Biosensing, College of Chemistry and Chemical Engineering, Hunan University Changsha 410082 P. R. China kunli@hnu.edu.cn.

Chemical Science
|August 13, 2025
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Summary

This study introduces manganese-doped lithium iron phosphate (LFMP) nanozymes to efficiently degrade microplastics. The engineered LFMP nanozymes show improved catalytic activity and stability, overcoming common nanozyme limitations.

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Area of Science:

  • Materials Science
  • Environmental Science
  • Catalysis

Background:

  • Microplastic degradation is a critical environmental issue requiring advanced catalytic solutions.
  • Nanozymes offer cost-effective, multi-enzyme mimicry but suffer from self-consumption, limiting practical applications.
  • Improving nanozyme stability and activity is essential for effective environmental remediation.

Purpose of the Study:

  • To engineer manganese-doped lithium iron phosphate (LFMP) nanozymes to enhance catalytic activity and stability for microplastic degradation.
  • To investigate the role of Mn2+ doping in modulating ion migration and lattice structure for improved nanozyme performance.
  • To address the self-consumption issue in nanozymes through lattice expansion strategies.

Main Methods:

  • Density Functional Theory (DFT) calculations to analyze the effects of Mn2+ doping on LFP's electronic structure and ion migration.
  • Synthesis and characterization of Mn-doped LFP (LFMP) nanozymes.
  • Assessing the peroxidase-like activity and cycling stability of LFMP nanozymes in degrading polyamide 6, HDPE, and polypropylene microplastics.

Main Results:

  • DFT calculations confirmed that Mn2+ doping expands the LFP lattice and narrows the bandgap, enhancing Li+ migration.
  • LFMP nanozymes exhibited 3 times higher peroxidase-like activity compared to undoped LFP.
  • LFMP demonstrated superior cycling stability, retaining 80% activity after 5 cycles versus 45% for LFP, enabling efficient microplastic degradation.

Conclusions:

  • Lattice expansion via Mn2+ doping effectively enhances nanozyme catalytic activity and stability by modulating ion migration.
  • LFMP nanozymes provide a promising bio-inspired strategy for efficient microplastic degradation, overcoming nanozyme self-consumption limitations.
  • This approach offers a new paradigm for designing robust and highly active nanozymes for environmental applications.