Self-propelled Janus magnetic micromotors as peroxidase-like nanozyme for colorimetric detection and removal of hydroquinone?

Environmental Science: Nano Pub Date: 2022-12-22 DOI: 10.1039/D2EN00990K

Abstract

Micromotors, which combine nanotechnology with autonomous movement, have attracted extensive interest in the field of environmental monitoring and remediation. However, it is still a challenge to develop a facile method to prepare a multifunctional micromotor for simultaneously detecting and removing organic pollutants from water. Herein, we report a novel magnetically controllable Janus micromotor with peroxidase-like activity for simultaneous colorimetric detection and degradation of hydroquinone (HQ). Such polyethylene glycol (PEG) modified Janus micromotor was composed of calcined manganese(II) acetate modified Fe3O4@polyacrylic acid (PAA) and ferric oxide (Fe3O4) nanoparticles. The obtained Janus micromotors (P-FM JMMs) have a unique asymmetric structure and exhibit autonomous motion with a maximum speed of 95.2 ± 3.02 μm s?1 in the presence of 100 mM H2O2. Combining the advantages of autonomous motion and superior peroxidase-like activity, P-FM JMMs as effective micromotors were established for dynamic sensitive colorimetric detection of HQ with a detection limit of 0.0923 μM and rapid degradation of HQ via excellent Fenton-like activity in water. In addition, such Janus micromotors also could achieve effective magnetic recovery to reduce water pollution. The strategy provides a new insight for the future multifunctional task allocation of micromotors on demand.

Graphical abstract: Self-propelled Janus magnetic micromotors as peroxidase-like nanozyme for colorimetric detection and removal of hydroquinone
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