Light and Magnetism Orchestrating Aquatic Pollutant‐Degradation Robots in Programmable Trajectories

Interfacial floating robots have promising applications in carriers, environmental monitoring, water treatment, and so on. Even though, engineering smart robots with both precisely efficient navigation and elimination of water pollutants in long term remains a challenge, as the superhydrophobicity greatly lowers resistance for aquatic motion while sacrificing chemical reactivity of the surface. Here, a pollutant‐removing superhydrophobic robot integrated with well‐assembled iron oxide‐bismuth sulfide heterojunction composite minerals, which provide both light and magnetic propulsion, and the ability of catalytic degradation, is reported. The motion velocity of the robot reaches up to 51.9 mm s−1 within only 300 ms of acceleration under the orchestration of light, and brakes rapidly (≈200–300 ms) once turn off the light. And magnetism extends the robot to work in broad range of surface tensions in any programmable trajectory. Besides, purification of polluted water is efficiently achieved in situ and the degradation efficiency exhibits eightfold enhancements under the effect of light‐triggered photothermal behavior coupled with magnetic induction, overcoming the dilemma of efficient motion with catalytic superhydrophobicity. This strategy developed here provides guidelines for the explorations of high‐performance smart devices. A smart aquatic superhydrophobic robot integrated with well‐assembled composite heterojunction minerals is developed based on the liquid film‐confined strategy. Taking advantage of the remarkable photothermal and magnetic properties, the aquatic robot exhibits ultra‐efficient navigation in broad range of surface tensions, and the purification of polluted water is efficiently achieved in situ by the synergistic orchestration of light and magnetism.