Uptake Mechanism of Acetic Acid onto Natural Gobi Dust,ACS Earth and Space Chemistry

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Uptake Mechanism of Acetic Acid onto Natural Gobi Dust
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2020-08-20 , DOI: 10.1021/acsearthspacechem.0c00168
Xianjie Wang _{1,

2} , Manolis N. Romanias ₂ , Zhehao Pei _{1,

3} , Antoine Rousseau ₁ , Frédéric Thévenet ₂

Affiliation

A challenge for understanding the environmental fate of atmospheric organic acids is to evaluate the impacts of their heterogeneous interactions with mineral dust aerosols in the atmosphere. However, the uptake of organic acids on authentic natural mineral dust is rarely investigated under atmosphere-relevant conditions. Herein, we investigated the uptake of acetic acid (AcA) onto a natural mineral dust from the Gobi Desert, Gobi dust, under atmosphere-relevant conditions, combining both the gas-phase and adsorbed-phase approaches. Gobi dust is evidenced to reversibly and irreversibly adsorb AcA molecules under both dry and humid conditions. In the presence of moisture, the fraction of the reversibly adsorbed AcA is promoted, which addresses the impact of water molecules with AcA on minerals. Physisorbed AcA monomer, dimer, and chemisorbed acetate are identified based on real-time surface monitoring using diffuse reflectance infrared Fourier transform spectroscopy. This study provides original data and insights into the impacts of heterogeneous interactions with mineral dust on the environmental fate of acetic acid. It also provides complete and visual mechanisms for a comprehensive understanding of the involved surface reactions. This study initiates the exploration of the heterogeneous kinetics of the fractions of reversibly and irreversibly adsorbed AcA on natural mineral dust under atmospheric conditions.

中文翻译：

天然戈壁粉尘对乙酸的吸收机理

理解大气有机酸的环境命运的挑战是评估其与大气中矿物粉尘气溶胶的异质相互作用的影响。但是，很少在与大气有关的条件下研究在真实的天然矿物粉尘上吸收有机酸的情况。在本文中，我们结合了气相法和吸附法，研究了在大气相关条件下，从戈壁沙漠中的天然矿物粉尘中吸收乙酸（AcA）的方法。戈壁粉尘在干燥和潮湿条件下都可逆和不可逆地吸附AcA分子。在存在水分的情况下，可逆吸附的AcA的比例增加，这解决了AcA的水分子对矿物质的影响。物理吸附的AcA单体，二聚体，化学和乙酸盐的吸附是基于使用漫反射红外傅里叶变换光谱法进行的实时表面监测确定的。这项研究提供了原始数据和对矿物粉尘异质相互作用对乙酸环境命运影响的见解。它还提供了完整的视觉机制，可全面了解所涉及的表面反应。这项研究启动了在大气条件下对天然矿物粉尘上可逆和不可逆吸附的AcA组分的异质动力学的探索。这项研究提供了原始数据和有关矿物粉尘异质相互作用对乙酸环境命运影响的见解。它还提供了完整的视觉机制，可全面了解所涉及的表面反应。这项研究启动了在大气条件下对天然矿物粉尘上可逆和不可逆吸附的AcA组分的异质动力学的探索。这项研究提供了原始数据和有关矿物粉尘异质相互作用对乙酸环境命运影响的见解。它还提供了完整的视觉机制，可全面了解所涉及的表面反应。这项研究启动了在大气条件下对天然矿物粉尘上可逆和不可逆吸附的AcA组分的异质动力学的探索。

更新日期：2020-09-18

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