Dual-Mode-Driven Micromotor Based on Foam-like Carbon Nitride and Fe 3 O 4 with Improved Manipulation and Photocatalytic Performance.

Micro/nanomotors have emerged as a vibrant research topic in biomedical and environmental fields due to their attractive self-propulsion as well as small-scale functionalities. However, single actuated micro/nanomotors are not adaptive in facing intricate natural and industrial environments. Herein, we propose a new dual-mode-driven micromotor based on foam-like carbon nitride (f-C 3 N 4 ) with precipitated Fe 3 O 4 nanoparticles, namely, Fe 3 O 4 /f-C 3 N 4 , powered by chemical/magnetic stimuli for rapid reduction of organic pollutants. The Fe 3 O 4 /f-C 3 N 4 motor composed of a three-dimensional (3D) porous "foam-like" structure and precipitated Fe 3 O 4 nanoparticles (ca. 50 nm) not only exhibits efficient photocatalytic performance under visible light but also shows versatile and programmable motion behavior under the control of external magnetic fields. The aggregation of the micromotor under an external rotating magnetic field further enhances the catalytic activity by the increased local catalyst concentration. Furthermore, the magnetic property endows the micromotor with easy recyclability. This study provides a novel dual-mode-driven micromotor for antibiotics removal with magnetic field and light-enhanced performance in industrial wastewater treatment at a low cost.