Publications

Magnetically steerable iron oxides-manganese dioxide core–shell micromotors for organic and microplastic removals
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Because of micro/nanoscale manipulation and task-performing capability, micro/nanomotors (MNMs) have attracted lots of research interests for potential applications in biomedical and environmental applications. Owing to the low cost, good motion behaviour, and environmental friendliness, various low-cost metal oxides based MNMs become promising alternatives to the precious metal-based MNMs, in particular for environmental remediation applications. Hereby, we demonstrate the facile and scalable fabrication of two types of bubble-propelled iron oxides—MnO₂ core–shell micromotors (Fe₃O₄-MnO₂ and Fe₂O₃-MnO₂) for pollutant removal. The Fe₂O₃-MnO₂ micromotor exhibits efficient removals of both aqueous organics and suspended microplastics via the synergy of catalytic degradation, surface adsorption, and adsorptive bubble separation mechanisms. The adsorptive bubble separation achieved more than 10% removal of the suspended microplastics from the polluted water in 2 h. We clarified the major contributions of different remediation mechanisms in pollutant removals, and the findings may be beneficial to a wide range of environmental applications of MNMs.

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