Study on CO₂ adsorption of illite and its microstructural characterization post adsorption: High-pressure and supercritical tests

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science Pub Date : 2025-02-03 DOI:10.1016/j.clay.2025.107738

Xianfeng Ma , Guohang Tang , Fawu Wang , Jianglin Cao , Bolong Ma , Haihua Zhang

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引用次数: 0

Abstract

Illite, a prevalent clay mineral, is extensively found in sedimentary rocks, weathering crusts, and soils. Its adsorption capacity has attracted considerable interest for carbon dioxide (CO₂) geological sequestration research. This study aimed to investigate the fundamental CO₂ adsorption behavior of illite, as well as the effects of moisture content and temperature on this process, utilizing high-pressure adsorption and supercritical adsorption tests. Nitrogen adsorption tests were conducted to assess the variations in specific surface area, pore volume, and average pore size of illite before and after CO₂ adsorption. Additionally, X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS) techniques were employed to characterize the mineral composition and elemental characteristics of raw illite, CO₂-adsorbed illite under dry conditions, and CO₂-adsorbed illite under wet conditions. The results indicated that an increase in moisture content diminishes CO₂ adsorption capacity of illite and leads to a transition of the isosteric heat of adsorption from positive to negative. Furthermore, with rising temperature and moisture content, the specific surface area, pore volume, and average pore size of illite increased following CO₂ adsorption. Additionally, CO₂ adsorption modified the mineral and elemental composition of illite. These results were essential for enhancing the fundamental understanding of CO₂ geological sequestration efficiency and hold promise as a technical foundation for engineering applications.

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来源期刊

Applied Clay Science 地学-矿物学

CiteScore

10.30

自引率

10.70%

发文量

289

审稿时长

39 days

期刊介绍： Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as: • Synthesis and purification • Structural, crystallographic and mineralogical properties of clays and clay minerals • Thermal properties of clays and clay minerals • Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties • Interaction with water, with polar and apolar molecules • Colloidal properties and rheology • Adsorption, Intercalation, Ionic exchange • Genesis and deposits of clay minerals • Geology and geochemistry of clays • Modification of clays and clay minerals properties by thermal and physical treatments • Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays) • Modification by biological microorganisms. etc...