Efficient photocatalytic degradation of gas‐phase formaldehyde by Pt/TiO2 nanowires in a continuous flow reactor

Abstract Herein, we investigated the photocatalytic degradation of gas‐phase formaldehyde (HCHO) on Pt deposited TiO 2 nanowires (Pt/TiO 2 NW) at continuous flow. Formaldehyde is decomposed into CO 2 and H 2 O in a homemade tube reactor under the LED irradiation. The reactor can monitor online various parameters such as formaldehyde concentration, light intensity, humidity, and temperature. The results indicated that the formaldehyde degradation rate of Pt/TiO 2 NW increased at continuous flow compared with TiO 2 nanowires. Under ultraviolet and visible LED light irradiation, the stable time of degrading low‐concentration formaldehyde by Pt/TiO 2 NW was 5.6 times that of TiO 2 NW. Higher ambient humidity facilitates the formaldehyde degradation of Pt/TiO 2 NW by increasing the hydroxyl radical ( . OH) and superoxide radical ( . ).