Light-driven synthetic micro-/nanomotors have attracted considerable attention in recent years due to their unique performances and potential applications. We herein demonstrate the dye-enhanced self-electrophoretic propulsion of light-driven TiO₂–Au Janus micromotors in aqueous dye solutions. Compared to the velocities of these micromotors in pure water, 1.7, 1.5, and 1.4 times accelerated motions were observed for them in aqueous solutions of methyl blue (10⁻⁵ g L⁻¹), cresol red (10⁻⁴ g L⁻¹), and methyl orange (10⁻⁴ g L⁻¹), respectively. We determined that the micromotor speed changes depending on the type of dyes, due to variations in their photodegradation rates. In addition, following the deposition of a paramagnetic Ni layer between the Au and TiO₂ layers, the micromotor can be precisely navigated under an external magnetic field. Such magnetic micromotors not only facilitate the recycling of micromotors, but also allow reusability in the context of dye detection and degradation. In general, such photocatalytic micro-/nanomotors provide considerable potential for the rapid detection and “on-the-fly” degradation of dye pollutants in aqueous environments.

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光驱动合成微/纳米电动机由于其独特的性能和潜在的应用，近年来引起了相当大的关注。我们在本文中演示了水性染料溶液中光驱动的TiO ₂ -Au Janus微电机对染料的自电泳推进。与这些微电机在纯水中的速度相比，在甲基蓝（10 ^-5  g L ^-1），甲酚红（10 ^-4  g L ^-1）的水溶液中观察到它们的加速运动分别为1.7、1.5和1.4倍。）和甲基橙（10 ^-4  g L ^-1）， 分别。我们确定，由于其光降解速率的变化，微电机的速度根据染料的类型而变化。另外，在Au和TiO ₂层之间沉积顺磁性Ni层之后，可以在外部磁场下精确地操纵微电机。这样的磁性微型马达不仅促进微型马达的回收，而且在染料检测和降解的背景下还允许重复使用。通常，这种光催化微型/纳米电动机为在水性环境中快速检测和“即时”降解染料污染物提供了巨大的潜力。

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