Heterogeneous surface reactions play a key role in the chemistry of the indoor environment because of the large indoor surface‐to‐volume ratio. The presence of photocatalytic material in indoor paints may allow photochemical reactions to occur at wavelengths of light that are present indoors. One such potential reaction is the heterogeneous photooxidation of NO to HONO. NO(g) is commonly found indoors, originating from combustion sources, ventilation and infiltration of outdoor air. We studied the interaction of NO(g) with painted surfaces illuminated with indoor fluorescent and incandescent lighting. There is a loss of NO(g) to painted surfaces in the dark at both 0 and 50% RH. At 50% RH, there is a re‐release of some of that NO(g) under illumination. The same behavior is observed for illumination of different colored paints. This is in contrast to what is seen with TiO₂ as the substrate, where photoenhanced uptake of NO(g) and formation of NO₂(g) are observed. We hypothesize that the loss of NO(g) is due to adsorption and diffusion into the paint. The re‐release of NO under illumination is thought to be due to photooxidation of NO to HONO on the painted surface at higher relative humidities and subsequent HONO photolysis.

中文翻译：

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NO(g) 在涂漆表面的损失及其在室内照明下的重新发射

由于室内表面积与体积之比大，非均相表面反应在室内环境的化学中起着关键作用。室内涂料中光催化材料的存在可能允许在室内存在的光波长下发生光化学反应。一种这样的潜在反应是 NO 到 HONO 的非均相光氧化。NO(g) 常见于室内，来源于燃烧源、通风和室外空气的渗透。我们研究了 NO(g) 与用室内荧光灯和白炽灯照明的涂漆表面的相互作用。在 0% 和 50% RH 的黑暗中，NO(g) 会损失到涂漆表面。在 50% RH 下，某些 NO(g) 在光照下会重新释放。对于不同颜色涂料的照明，观察到相同的行为。₂作为底物，其中观察到NO(g)的光增强吸收和NO ₂ (g)的形成。我们假设 NO(g) 的损失是由于吸附和扩散到油漆中。NO 在光照下的重新释放被认为是由于在较高的相对湿度下在涂漆表面上 NO 光氧化为 HONO 以及随后的 HONO 光解。