Facile sample preparation method allowing TEM characterization of the stacking structures and interlayer spaces of clay minerals

Liu, Dong; Tian, Qian; Yuan, Peng; Du, Peixin; Zhou, Junming; Li, Yun; Bu, Hongling

doi:10.1016/j.clay.2019.01.019

Cited by 23 publications

(12 citation statements)

References 29 publications

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“…The samples were scanned from 3 to 35° with a 2θ step size of 0.02 and a count time of 1 s per step (Supporting Information, Section S7). For HRTEM characterization, a resin embedding method was used to prepare clay suspension . HRTEM analysis was performed using an FEI Talos F200S field-emission transmission electron microscope with an accelerating voltage of 200 kV.…”

Section: Methodsmentioning

confidence: 99%

“…For HRTEM characterization, a resin embedding method was used to prepare clay suspension. 41 HRTEM analysis was performed using an FEI Talos F200S fieldemission transmission electron microscope with an accelerating voltage of 200 kV. Electron energy-loss spectroscopy (EELS) analysis was performed using a Gatan Quantum EELS accessory.…”

Section: Reduction Of U(vi) Bymentioning

confidence: 99%

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Effect of Siderophore DFOB on U(VI) Adsorption to Clay Mineral and Its Subsequent Reduction by an Iron-Reducing Bacterium

Zhang

Dong

et al. 2022

Environ. Sci. Technol.

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Uranium mining and nuclear fuel production have led to significant U contamination. Past studies have focused on the bioreduction of soluble U(VI) to insoluble U(IV) as a remediation method. However, U(IV) is susceptible to reoxidation and remobilization when conditions change.Here, we demonstrate that a combination of adsorption and bioreduction of U(VI) in the presence of an organic ligand (siderophore desferrioxamine B, DFOB) and the Fe-rich clay mineral nontronite partially alleviated this problem. DFOB greatly facilitated U(VI) adsorption into the interlayer of nontronite as a stable U(VI)−DFOB complex. This complex was likely reduced by bioreduction intermediates such as the Fe(II)−DFOB complex and/or through electron transfer within a ternary Fe(II)−DFOB−U(VI) complex. Bioreduction with DFOB alone resulted in a mobile aqueous U(IV)−DFOB complex, but in the presence of both DFOB and nontronite U(IV) was sequestered into a solid. These results provide novel insights into the mechanisms of U(VI) bioreduction and the stability of U and have important implications for understanding U biogeochemistry in the environment and for developing a sustainable U remediation approach.

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Section: Methodsmentioning

confidence: 99%

Section: Reduction Of U(vi) Bymentioning

confidence: 99%

Effect of Siderophore DFOB on U(VI) Adsorption to Clay Mineral and Its Subsequent Reduction by an Iron-Reducing Bacterium

Zhang

Dong

et al. 2022

Environ. Sci. Technol.

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“…In addition to the macromolecule models of kerogen, new molecular models of clay minerals in shale have also been reported. The clay minerals have remarkable characteristics of the interlayer structure, which is closely related to the reactivity of clay mineral species . The existing molecular models of clay minerals are all based on interlayer sheets.…”

Section: Organic Geochemical Evaluationmentioning

confidence: 99%

“…The clay minerals have remarkable characteristics of the interlayer structure, which is closely related to the reactivity of clay mineral species. 62 The existing molecular models of clay minerals are all based on interlayer sheets. As shown in Figure 2, the interlayer sheets of various clay minerals were adopted to construct molecular models, and most of these layered sheet structures are taken from the Crystallography Open Database (COD)/Cambridge Crystallographic Data Centre (CCDC) database.…”

Section: Organic Geochemical Evaluationmentioning

confidence: 99%

Methods for Petrological and Petrophysical Characterization of Gas Shales

et al. 2021

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The increasing significance of shale gas resources to the global energy supply has resulted in an increasing need to understand shales as gas reservoirs. Shales commonly have complex organic and inorganic compositions and ultrafine pore structures. Fluid flow and transport in shale gas reservoirs (SGRs) are scale-dependent processes, including adsorption/desorption and diffusion of gas, water imbibition, and other non-Darcy flows, which is in contrast with conventional natural gas reservoirs, such as sandstones. In recent years, the transferring of the opinion from the prior efforts on studying the source and seal potential to the purpose of the function as the gas reservoir is creating some new challenges to the conventional analysis methods for SGRs. There has been a much larger number of publications relating to “shale and method” in the last 5 years compared to previously. On the basis of a review of these publications, this review summarizes both progresses made to improve or modify conventional methods as well as the application of new, emerging methods for a description of the complex shale petrology, rock physics, and flow mechanisms. The main part of this review is divided into six sections: organic geochemical evaluation, pore properties, such as pore type, porosity, specific surface area, and pore size distribution, wettability assessment, quantification of imbibition, gas adsorption and diffusion, and permeability evaluation. In each section, the advantages and disadvantages of conventional and emerging methods are reviewed. The goal of this review is to provide a guide for the reader to help them choose appropriate methods for future work in SGRs.

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“…For this reason, XRD analysis may miss critical information on mineral weathering pathways, especially when mineral abundances are low. As an alternative, high-resolution transmission electron microscopy (HRTEM) enables direct imaging of clay minerals at the nanoscale (e.g., Kogure and Inoue 2005;Liu et al 2019;Kogure 2020). A combination of XRD and HRTEM represents the most powerful approach for characterizing clay minerals, especially transformations between different clay minerals (Kogure et al 2013).…”

Section: Introductionmentioning

confidence: 99%

The role of parent lithology in nanoscale clay-mineral transformations in a subtropical monsoonal climate

Zhao

Hong

Yin

et al. 2023

American Mineralogist

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Facile sample preparation method allowing TEM characterization of the stacking structures and interlayer spaces of clay minerals

Cited by 23 publications

References 29 publications

Effect of Siderophore DFOB on U(VI) Adsorption to Clay Mineral and Its Subsequent Reduction by an Iron-Reducing Bacterium

Effect of Siderophore DFOB on U(VI) Adsorption to Clay Mineral and Its Subsequent Reduction by an Iron-Reducing Bacterium

Methods for Petrological and Petrophysical Characterization of Gas Shales

The role of parent lithology in nanoscale clay-mineral transformations in a subtropical monsoonal climate

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