  Sorting of microswimmers based on their mobility properties is of utmost
importance for various branches of science and engineering. In this paper, we
proposed a novel sorting method, where the mixed chiral particles can be
separated by applying two opposite rotary obstacles. It is found that when the
angular speed of the obstacles, the angular speed of active particles and the
self-propulsion speed satisfy a certain relation, the mixed particles can be
completely separated and the capture efficiency takes its maximal value. Our
results may have application in capture or sorting of chiral active particles,
or even measuring the chirality of active particles.
