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DOI	10.1016/j.atmosenv.2019.117222
	Photochemical reaction of CO2 on atmospheric mineral dusts
	Deng Y.; Liu Y.; Wang T.; Cheng H.; Feng Y.; Yang Y.; Zhang L.
发表日期	2020
ISSN	1352-2310
卷号	223
英文摘要	Airborne mineral dust is a big contributor to atmospheric particulate matter. Complex chemistry of mineral dust surfaces might give rise to the conversion of some important atmospheric trace gases. Herein, for the first time we find that CO2 can be photochemically reduced to CO, which is an ozone precursor in the atmosphere, on mineral dust particles. In this study, we performed CO2 uptake experiments using a quartz reactor and investigated the uptake kinetics of CO2 on TiO2 particles and authentic mineral dust (Arizona Test Dust, illite, montmorillonite, and kaolin) under simulated atmospheric conditions using gas chromatography (GC). The impacts of different relative humidity (RH) values and irradiation intensities on CO2 photoreduction were studied. Moreover, the surface intermediate of the heterogeneous photoreduction of CO2 with mineral dust and its kinetic relevance were investigated using in situ DRIFTS and isotopic 13C labelling. Furthermore, field observations of increased CO concentrations in a mineral dust storm were interpreted as the results of the direct uptake of CO2 on the mineral dust surface and the following photochemical reaction of CO2 on atmospheric mineral dusts under solar irradiation. In summary, we provide evidence for a pathway in which CO2 interacts with mineral dust and is converted into CO under artificial solar light. Due to the abundance of CO2 and mineral dust in the lower atmosphere, this process could cause some impacts on the atmosphere and climate. © 2019 Elsevier Ltd
关键词	CO CO2 Heterogeneous chemistry Mineral dust Photochemistry
语种	英语
scopus关键词	Atmospheric chemistry; Atmospheric humidity; Carbon dioxide; Cobalt; Gas chromatography; Irradiation; Oxide minerals; Photochemical reactions; Storms; Titanium dioxide; Atmospheric conditions; Atmospheric mineral dust; Atmospheric particulate matter; Atmospheric trace gas; Heterogeneous chemistry; Mineral dust; Mineral dust particles; Surface intermediates; Dust; carbon 13; carbon dioxide; kaolin; montmorillonite; ozone; titanium dioxide; atmospheric pollution; carbon dioxide; chemical reaction; mineral dust; ozone; particulate matter; photochemistry; trace gas; atmosphere; climate; controlled study; diffuse reflectance infrared Fourier transform spectroscopy; gas chromatography; humidity; mineral dust; photochemistry; precursor; reduction (chemistry); solar radiation; Arizona; United States
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/249409
作者单位	Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science and Engineering, Fudan University, Shanghai, 200433, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China
推荐引用方式 GB/T 7714	Deng Y.,Liu Y.,Wang T.,et al. Photochemical reaction of CO2 on atmospheric mineral dusts[J],2020,223.
APA	Deng Y..,Liu Y..,Wang T..,Cheng H..,Feng Y..,...&Zhang L..(2020).Photochemical reaction of CO2 on atmospheric mineral dusts.ATMOSPHERIC ENVIRONMENT,223.
MLA	Deng Y.,et al."Photochemical reaction of CO2 on atmospheric mineral dusts".ATMOSPHERIC ENVIRONMENT 223(2020).