Polymeric Nanocapsule Enhances the Peroxidase-like Activity of Fe3 O4 Nanozyme for Removing Organic Dyes

Junqi Zha, Wugao Wu, Peng Xie, Honghua Han, Zheng Fang, Yantao Chen, Zhongfan Jia

Research output: Contribution to journalArticlepeer-review

Abstract

Peroxidase-like nanozymes are nanoscale materials that can closely mimic the activity of natural peroxidase for a range of oxidation reactions. Surface coating with polymer nanogels has been considered to prevent the aggregation of nanozymes. For a long time, the understanding of polymer coating has been largely limited to its stabilization effect on the nanozyme in aqueous media, while little is known about how polymer coating plays a role in interaction with substrates and primary oxidants to dictate the catalytic process. This work reported a facile sequential modification of Fe3 O4 nanoparticles to polyacrylamide coated nanozymes, and as low as 112 mg/L samples with only 5 mg/L Fe3 O4 could nearly quantitatively (99%) remove a library of organic dyes with either H2 O2 or Na2 S2 O8 as primary oxidants. The catalytic results and molecular simulation provide both experimental and computational evidence that the hydrogen bonding interaction between the reactant and nanozymes is key for the high local concentration hence catalytic efficiency. We envision that this work, for the first time, provides some insights into the role of polymer coating in enhancing the catalytic activity of nanozyme apart from the well-known water dispersity effect.

Original languageEnglish
Article number614
Number of pages14
JournalCatalysts
Volume12
Issue number6
DOIs
Publication statusPublished - 3 Jun 2022

Keywords

  • advanced oxidation processes
  • Fe O nanoparticle
  • nanozyme
  • organic pollutant
  • peroxidase-like activity
  • polymeric nanocapsule

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