Although photocatalytic reactions using the ultraviolet (UV) range (particularly UV B (280–320 nm) wavelengths) is well-established, the photocatalytic effect of longer wavelengths (especially that of UVA (≥380 nm) and visible light (≥400 nm)) have only recently been studied and utilized for environmental applications. In this work, we coated polydopamine (PDA) and TiO₂ on a support and investigated the synergistic effects of the corresponding composites for the photocatalytic removal of gaseous ammonia under 405 nm violet-blue light. The PDA layer with TiO₂ was covalently attached on a ceramic ball using the drop-casting method. The roughness and functional groups of the TiO₂-PDA coated ball surfaces were verified using an infrared imaging microscope and field emission scanning electron microscope (FE-SEM). The photocatalytic activity of the obtained hybrid TiO₂-PDA coated ball for the removal of ammonia was investigated using a UV C and 405 nm LED lamp at 24 °C. The results showed that both the TiO₂ (control sample) and TiO₂-PDA coated balls successfully removed ammonia under similar experimental conditions with the 254 nm UV C lamp. Notably, the TiO₂-PDA coated ball exhibited an enhanced ammonia removal efficiency of 72% under 405 nm LED light irradiation. Thus, the TiO₂-PDA coated ball is a promising indoor air cleaning technique under LED light irradiation.

尽管使用紫外 (UV) 范围（特别是 UV B (280–320 nm) 波长）的光催化反应已得到广泛认可，但较长波长（尤其是 UVA（≥380 nm）和可见光（≥400 nm）的光催化效应） )) 直到最近才被研究并用于环境应用。在这项工作中，我们将聚多巴胺 (PDA) 和 TiO ₂涂覆在载体上，并研究了相应复合材料在 405 nm 紫蓝光下光催化去除气态氨的协同效应。_{使用滴注法将具有 TiO 2}的 PDA 层共价连接在陶瓷球上。_{TiO 2}的粗糙度和官能团-使用红外成像显微镜和场发射扫描电子显微镜（FE-SEM）验证PDA涂层球表面。使用 UV C 和 405 nm LED 灯在 24 °C 下研究获得的杂化 TiO ₂ -PDA 涂层球去除氨的光催化活性。结果表明，在使用 254 nm UV C 灯的类似实验条件下， TiO ₂（对照样品）和 TiO _{2 -PDA 涂层球均成功去除了氨。}值得注意的是，在 405 nm LED 光照射下，TiO ₂ -PDA 涂层球的氨去除效率提高了 72%。因此，TiO ₂ -PDA 涂层球在 LED 光照射下是一种很有前途的室内空气净化技术。