The study of combining the catalytic activity of nanomaterials to the self-propelled micro/nanomotors is rapidly growing for determining and degrading contaminates in the water environment, especially in constructing a cost-effective platform that can simultaneously achieve both functions. Here we reported a novel bifunctional magnetic micromotor (CA-MnO2@Co-N/C) with greatly enhanced micromixing performance, as well as improved detection and degradation capabilities for aniline in water. The CA-MnO2@Co-N/C micromotors were composed of bioderived carbon matrix, ZIF-67 derived magnetic Co-N/C and MnO2 nanosheets, the CA-MnO2@Co-N/C micromotors not only exhibited excellently peroxidase-like activity (POD-like activity) but also showed superior Fenton-like catalytic activity. The micromotors achieved self-propulsion motion by generating O2 bubbles from the catalytic decomposition of H2O2, with the highest speed of 398.88 μm/s in 7 wt% H2O2. It exhibited sensitive detection and efficient removal toward aniline in water, which was attributed to the synergist between hierarchical structure, citric acid modification and bubble-driven propulsion. The limit of detection (LOD) for aniline was 0.185 μM, and the highest removal efficiency of aniline reached 83% in 180 min based on our dynamic catalytic reaction platform. In comparison to traditional micro/nanomaterials, the simple fabrication process, the self-propulsion performance, and the excellent catalytic activity of the CA-MnO2@Co-N/C micromotors provided a promising strategy dynamic environmental monitoring and remediation platform.

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