Abstract
Micromotors have hold great promise for environmental remediation. Herein, we reported a novel γ-Fe2O3@Ag-mSiO2NH2 magnetic Janus micromotor for dynamic removal of heavy metal ions and organic pollutants from water. The as-prepared Janus micromotors displayed unique core-shell structure composed of amino-functionalized meso‑SiO2 shell and γ-Fe2O3 magnetic core, and could be propelled by O2 bubbles generated by Ag-catalyzed decomposition of H2O2. This Janus micromotor could move with a high velocity of 203.06 ± 10.6 μm s−1 (about 253.8 body lengths s–1) in 10 wt.% H2O2 solution. γ-Fe2O3@Ag-mSiO2NH2 magnetic Janus micromotor showed much higher removal capacities for Cu2+ (15.59 mg g−1) and doxycycline (31.45 mg g−1) than its static control samples due to the synergy of self-propulsive movement and amino-functionalized porous core-shell structure. Furthermore, the magnetic γ-Fe2O3 cores enabled the remote magnetic control on the movement direction and magnetic recycling. This work provides a new strategy for environmental pollutants treatment.
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