Biotemplated Shell Micromotors for Efficient Degradation of Antibiotics via Enhanced Peroxymonosulfate Activation

Abstract Self‐propelled magnetic MnO 2 @pollen micromotors have been developed as active heterogeneous catalysts of peroxymonosulfate (PMS) activation for efficient degradation of antibiotics. The MnO 2 nanosheets (NSs) and Fe 3 O 4 nanoparticles (NPs) are constructed on hollow pollens with small openings, endowing the natural materials with multifunctional properties. MnO 2 NSs can decompose H 2 O 2 to provide propulsion for micromotor movement, and also cooperate with Fe 3 O 4 NPs to activate PMS to produce active free radicals SO 4 ·− . Together with the OH· generated by Fe 3 O 4 NPs and H 2 O 2 , the prepared micromotor catalyst can realize the degradation of tetracycline (TC) within several minutes. The self‐propulsion and abundant bubble formation cause effective fluid mixing and intensification of mass transfer, making up the low diffusivity defect of traditional heterogeneous catalysts. Moreover, the magnetic properties lay a foundation for the long‐range magnetic control and reutilization of heterogeneous catalysts, avoiding wastage and secondary contamination. The proposed self‐propelled pollen micromotors provide a highly efficient, economic, and environmentally friendly platform for the degradation of antibiotics.