Cyclodextrin‐Functionalized Light‐Driven Cu 2 O Micromotors for Simultaneous Capture and Degradation of Bisphenol A

Light‐driven micromotors capable of autonomous motion and pollutant removal offer promising strategies for active water remediation. Here, we introduce fuel‐free Cu 2 O‐based photocatalytic micromotors functionalized with β‐cyclodextrin (β‐CD) for the simultaneous capture and degradation of bisphenol A. Truncated‐octahedral Cu 2 O particles were decorated with Au nanoparticles to enable immobilization of thiolated β‐CD, forming Cu 2 O@Au@SH‐β‐CD micromotors. Under 475 nm illumination, β‐CD functionalization increases propulsion velocities in water to approximately 2.5–3 times in comparison with nonfunctionalized micromotors. In parallel, supramolecular β‐CD cavities promote bisphenol A capture, increasing local pollutant concentration at the photocatalyst surface. As a result, Cu 2 O@Au@SH‐β‐CD micromotors achieve 91% bisphenol A removal under light irradiation, with an apparent rate constant k app ≈ 0.021 min −1 , outperforming bare Cu 2 O and Cu 2 O@Au systems. These results demonstrate that supramolecular surface engineering can couple enhanced autonomous motion with selective capture and photocatalytic degradation in light‐driven micromotors.