Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.aeolia.2017.06.001 |
Investigating water adsorption onto natural mineral dust particles: Linking DRIFTS experiments and BET theory | |
Joshi, Nitesh; Romanias, Manolis N.; Riffault, Veronique; Thevenet, Frederic | |
通讯作者 | Romanias, Manolis N. ; Thevenet, Frederic |
来源期刊 | AEOLIAN RESEARCH
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ISSN | 1875-9637 |
EISSN | 2212-1684 |
出版年 | 2017 |
卷号 | 27页码:35-45 |
英文摘要 | The adsorption of water molecules on natural mineral dusts was investigated employing in situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS). The natural dust samples originated from North and West Africa, Saudi Arabia and Gobi desert regions. Furthermore, the hygroscopicity of commercially available Arizona Test Dusts (ATDs) and Icelandic volcanic ash were examined. N-2 sorption measurements, X-ray fluorescence and diffraction (XRF and XRD), as well as Inductively Coupled Plasma Mass Spectrometry (ICP-MS) analyses were performed to determine the physicochemical properties of the particles. The water adsorption experiments were conducted in an optical cell, at room temperature under the relative humidity (RH) range of 1.9-95%. Results were simulated using a modified three-parameter Brunauer-Emmett-Teller (BET) equation. Water monolayer (ML) was formed in the RH range of 15-25%, while additional water layers were formed at higher RH. Besides, the standard adsorption enthalpies of water onto natural mineral dust samples were determined. A thorough comparison of two commercially available ATD samples indicated that size distribution and/or porosity should play a key role in particle hygroscopicity. Regarding the natural mineral particles, Ca/Si ratios, and to a lesser extent Al/Si, Na/Si, Mg/Si ratios, were found to impact the minimum RH level required for water monolayer formation. These results suggest that the hygroscopic properties of investigated African dusts are quite similar over the whole investigated RH range. Furthermore, one of the major conclusions is that under most atmospheric relative humidity conditions, natural mineral samples are always covered with at least one layer of adsorbed water. (C) 2017 Elsevier B.V. All rights reserved. |
英文关键词 | Mineral dust Chemical characterization Hygroscopicity Water monolayer DRIFTS |
类型 | Article |
语种 | 英语 |
国家 | France |
收录类别 | SCI-E |
WOS记录号 | WOS:000407536900004 |
WOS关键词 | EXCESS SURFACE WORK ; AFRICAN DUST ; HETEROGENEOUS INTERACTION ; CLOUD CONDENSATION ; ATMOSPHERIC PARTICLES ; PART 1 ; AEROSOL ; CHEMISTRY ; KINETICS ; ACID |
WOS类目 | Geography, Physical |
WOS研究方向 | Physical Geography |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/197057 |
作者单位 | Univ Lille, IMT Lille Douai, SAGE Dept Sci Atmosphere & Genie Environm, F-59000 Lille, France |
推荐引用方式 GB/T 7714 | Joshi, Nitesh,Romanias, Manolis N.,Riffault, Veronique,et al. Investigating water adsorption onto natural mineral dust particles: Linking DRIFTS experiments and BET theory[J],2017,27:35-45. |
APA | Joshi, Nitesh,Romanias, Manolis N.,Riffault, Veronique,&Thevenet, Frederic.(2017).Investigating water adsorption onto natural mineral dust particles: Linking DRIFTS experiments and BET theory.AEOLIAN RESEARCH,27,35-45. |
MLA | Joshi, Nitesh,et al."Investigating water adsorption onto natural mineral dust particles: Linking DRIFTS experiments and BET theory".AEOLIAN RESEARCH 27(2017):35-45. |
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