Indoor Lighting Releases Gas Phase Nitrogen Oxides from Indoor Painted Surfaces

作者：Heather Schwartz‐Narbonne, Stephanie H. Jones, D. J. Donaldson · 发表于：Environmental Science & Technology Letters · 年份：2019 · DOI：10.1021/acs.estlett.8b00685 · 被引用次数：49 · 研究领域：Atmospheric chemistry and aerosols、Air Quality and Health Impacts、Air Quality Monitoring and Forecasting

High Resolution Image Download MS PowerPoint Slide The indoor environment provides unique surfaces and lighting conditions which affect the photochemistry taking place there. As indoor illumination sources typically output wavelengths too long to affect gas phase photochemistry, the potential for surface photochemistry induced by indoor light sources has been mostly unexplored. In this proof of concept study, we report the emission of gas phase nitrogen oxides as a product of the illumination of glass surfaces coated with nitrate-doped TiO 2 and nitratedeposited on indoor paint, using a variety of common indoor light sources. Fluorescent, incandescent, halogen, and LED lights were studied, and a xenon lamp was used for baseline measurements. NO x was emitted from all samples, thus establishing that renoxification can occur in indoor environments. NO 2 (g) was the predominant species emitted from samples coated with nitrate-doped TiO 2, and NO (g) was the predominant species emitted from nitrate-deposited painted glass surfaces. It was also found that heating from the light sources had no effect on the production of NO x . This preliminary study establishes the potential for heterogeneous photochemistry to occur on real indoor surfaces and opens the way for further research to be conducted under realistic indoor conditions.