Improvement of reaction to remove nitrogen dioxide by Hedera genus with photocatalytic treatment

Abstract

Currently, nitrogen dioxide NO₂ has been the subject material caused heat island effect and global warming. In this study, we researched the more effective way of removing NO₂ by using Hedera helix L. and Hedera helix cv. Glacier that added photocatalytic coating, titanium dioxide (TiO₂) and tungsten trioxide (WO₃). Furthermore, we set the two light sources for the fluorescent lamp and ultraviolet fluorescent lamp. As the result, NO₂ removal (μg/m²•h) of each plant was not influenced by the condition of light, and NO₂ removal (μg/m²•h) was increased in order from the top, WO₃ plots, TiO₂ plots and non-plant (control) plots. In addition, the photocatalytic retention rate (%) was 16.9 to 41.7% in TiO₂ plots and 1.8 to 4.0% in WO₃ plots. However, photocatalytic retention rate (%) of WO₃ plots was very few. So, we suppose to expect higher effect of NO₂ removal by improving the photocatalytic retention rate of WO₃.