Formation of indoor nitrous acid (HONO) by light-induced NO2 heterogeneous reactions with white wall paint
Formation of indoor nitrous acid (HONO) by light-induced NO2 heterogeneous reactions with white wall paint
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DOI：
10.1007/s11356-014-2836-5
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发表时间：
2014-08-01
影响因子：
5.8
通讯作者：
Wortham, Henri
中科院分区：
文献类型：
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作者：
Bartolomei, Vincent;Soergel, Matthias;Wortham, Henri
气态二氧化氮（NO2）代表在各种室内环境中以相对高浓度存在的氧化剂。显著增加的NO2水平高达1.5 ppm与使用燃气灶的家庭有关。NO2与表面吸附水的非均相反应导致亚硝酸（HONO）的产生。在这里，我们提出了一个HONO源诱导的非均相反应的NO2与选定的室内油漆表面在光的存在下（300 nm < lambda < 400 nm）。我们证明，HONO的形成是在相对湿度升高更明显。在光的存在下（5.5 W m（-2）），HONO生产率的增加高达8.6。在[NO2] = 60 ppb和50%相对湿度（RH）下观察到10（9）个分子cm（-2）s（-1）。在10.6（W m（-2））的较高光强下，HONO产生速率增加到2.1。10（10）个分子cm（-2）s（-1）。观察到高达84%的NO2到HONO的高转化率。这一结果有力地表明，室内HONO生产的光驱动过程是可操作的。这项工作强调了油漆表面通过光诱导NO2非均相反应在室内环境中产生HONO的潜力。
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 < lambda < 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.