The cyclone reactor was by default positioned vertically. A NVSU233A U365 365nm LED (NICHIA Corporation) was positioned at a distance of 17 mm to the reactor window with a 3D-printed holder installed on top of the reactor. The LED was mounted on a heat sink and operated by a laboratory power supply with a electrical driving current of 0.2 A, except when stated otherwise. Using chemical resistant Norprene-Chemical-tubings (Saint-Gobain Performance Plastics Inc.), the reactor was connected to a 3D-printed reservoir and a CP-86 peristaltic pump (Gemketechnik GmbH).