Indoor Air Quality Implications of Germicidal 222 nm Light
Indoor Air Quality Implications of Germicidal 222 nm Light
复制标题
222 nm 杀菌光对室内空气质量的影响
DOI：
10.1021/acs.est.3c05680
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发表时间：
2023
影响因子：
11.4
通讯作者：
Kroll, Jesse H.
中科院分区：
文献类型：
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作者：
Barber, Victoria P.;Goss, Matthew B.;Franco Deloya, Lesly J.;LeMar, Lexy N.;Li, Yaowei;Helstrom, Erik;Canagaratna, Manjula;Keutsch, Frank N.;Kroll, Jesse H.
减轻包括 SARS-CoV-2 病毒在内的空气传播病原体在室内传播的一种策略是采用杀菌紫外线 (GUV) 照射。一种特别有前景的方法是来自 KrCl 准分子灯 (GUV222) 的 222 nm 光；这可以灭活空气中的病原体，并且被认为对于人类皮肤和眼睛暴露来说相对安全。然而，GUV222对室内空气成分的影响却很少有实验研究。在这里，我们在 150 L 特氟龙室中进行实验室实验，以检查 GUV222 次生物种的形成。我们证明GUV222会产生臭氧（O3）和羟基自由基（OH），两者都可以与挥发性有机化合物反应形成氧化的挥发性有机化合物和二次有机气溶胶颗粒。结果与基于已知光化学的盒模型一致。我们使用该模型在更真实的室内空气场景下模拟 GUV222 辐照，并证明在某些条件下，GUV222 辐照会导致 O3、OH 和二次有机产物的水平相对于正常室内条件大幅升高。结果表明，GUV222 应以低强度使用并与通风配合使用，以降低空气中病原体的水平，同时减少空气污染物的形成。
One strategy for mitigating the indoor transmission of airborne pathogens, including the SARS-CoV-2 virus, is irradiation by germicidal UV light (GUV). A particularly promising approach is 222 nm light from KrCl excimer lamps (GUV222); this inactivates airborne pathogens and is thought to be relatively safe for human skin and eye exposure. However, the impact of GUV222on the composition of indoor air has received little experimental study. Here, we conduct laboratory experiments in a 150 L Teflon chamber to examine the formation of secondary species by GUV222. We show that GUV222generates ozone (O3) and hydroxyl radicals (OH), both of which can react with volatile organic compounds to form oxidized volatile organic compounds and secondary organic aerosol particles. Results are consistent with a box model based on the known photochemistry. We use this model to simulate GUV222irradiation under more realistic indoor air scenarios and demonstrate that under some conditions, GUV222irradiation can lead to levels of O3, OH, and secondary organic products that are substantially elevated relative to normal indoor conditions. The results suggest that GUV222should be used at low intensities and in concert with ventilation, decreasing levels of airborne pathogens while mitigating the formation of air pollutants.