Bartolomei Vincent, Sörgel Matthias, Gligorovski Sasho, Alvarez Elena Gómez, Gandolfo Adrien, Strekowski Rafal, Quivet Etienne, Held Andreas, Zetzsch Cornelius, Wortham Henri
Aix Marseille University, CNRS, FRE 3416, Case 29, 3 place Victor Hugo, 13331, Marseille Cedex 3, France.
Environ Sci Pollut Res Int. 2014;21(15):9259-69. doi: 10.1007/s11356-014-2836-5. Epub 2014 Apr 11.
Gaseous nitrogen dioxide (NO2) represents an oxidant that is present in relatively high concentrations in various indoor settings. Remarkably increased NO2 levels up to 1.5 ppm are associated with homes using gas stoves. The heterogeneous reactions of NO2 with adsorbed water on surfaces lead to the generation of nitrous acid (HONO). Here, we present a HONO source induced by heterogeneous reactions of NO2 with selected indoor paint surfaces in the presence of light (300 nm<λ<400 nm). We demonstrate that the formation of HONO is much more pronounced at elevated relative humidity. In the presence of light (5.5 W m(-2)), an increase of HONO production rate of up to 8.6·10(9) molecules cm(-2) s(-1) was observed at [NO2]=60 ppb and 50% relative humidity (RH). At higher light intensity of 10.6 (W m(-2)), the HONO production rate increased to 2.1·10(10) molecules cm(-2) s(-1). A high NO2 to HONO conversion yield of up to 84% was observed. This result strongly suggests that a light-driven process of indoor HONO production is operational. This work highlights the potential of paint surfaces to generate HONO within indoor environments by light-induced NO2 heterogeneous reactions.
气态二氧化氮（NO₂）是一种氧化剂，在各种室内环境中浓度相对较高。使用燃气灶具的家庭中，二氧化氮水平显著升高，可达1.5 ppm。二氧化氮与表面吸附水的非均相反应会导致亚硝酸（HONO）的生成。在此，我们展示了在光照（300 nm＜λ＜400 nm）条件下，二氧化氮与选定的室内油漆表面发生非均相反应所诱导的HONO源。我们证明，在相对湿度升高时，HONO的形成更为显著。在光照（5.5 W m⁻²）条件下，当[NO₂]=60 ppb且相对湿度（RH）为50%时，观察到HONO生成速率增加高达8.6·10⁹分子 cm⁻² s⁻¹。在更高的光照强度10.6（W m⁻²）下，HONO生成速率增加到2.1·10¹⁰分子 cm⁻² s⁻¹。观察到高达84%的高NO₂到HONO转化率。这一结果有力地表明，室内HONO生成的光驱动过程是可行的。这项工作突出了油漆表面通过光诱导的NO₂非均相反应在室内环境中生成HONO的潜力。
