Mineralogical and Spectroscopic Study of Nesquehonite Synthesized by Reaction of Gaseous Co2 With Mg Chloride Solution

Skliros, V.; Anagnostopoulou, Angeliki; Tsakiridis, P.E.; Perraki, Maria

doi:10.12681/bgsg.11947

Cited by 6 publications

(5 citation statements)

References 18 publications

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“…The sample prepared from transparent grains was studied on two IR Fourier Protege 40 and "FT-801" spectrometers. The obtained IR spectra are similar to those described in the paper [32], characterized by the absorption bands typical for Nesquehonite such as the symmetric modes of stretching (v1) and bending (v2) (CO 3 ) 2 at 1099 cm −1 and 854 cm −1 , respectively. The three bands at 1520, 1469, and 1421 cm −1 are attributed to asymmetric stretching with splitting mode (v3) [33][34][35].…”

Section: Thermogravimetric Characteristics and Ir Spectrasupporting

confidence: 79%

Rare Hydrated Magnesium Carbonate Minerals Nesquehonite and Dypingite of the Obnazhennaya Kimberlite Pipe, in the Yakutian Kimberlite Province

Ugapeva,

Oleinikov,

Zayakina

2023

Minerals

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The result of a complex mineralogical study of the first discovery of the rare hydrated magnesium carbonate minerals of Nesquehonite and Dypingite in the Obnazhennaya kimberlite pipe (of the Yakutian kimberlite province) is presented. The methods of X-ray phase analysis, electronic microscopy, and Raman spectroscopy have established that the main minerals of the samples found in the form of white crust on a small area of rock outcrop of kimberlite breccia are hydrated carbonates: Nesquehonite is MgCO3•3H2O, Dypingite is Mg5(CO3)4(OH)2•5H2O. The formation of Dypingite over Nesquehonite was shown using Raman imaging for the first time. Nesquehonite is represented as aggregates consisting of chaotically oriented prismatic crystals or kidney-shaped formations. Dypingite in the examined samples appears less frequently as rose-shaped aggregates formed from lamellar crystals. It is assumed that the formation of rare carbonates of the Obnazhennaya kimberlite pipe is mainly the result of the weathering of silicates, formation of mineralized solutions, and their subsequent crystallization, including the capture of CO2 from the air.

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Section: Thermogravimetric Characteristics and Ir Spectrasupporting

confidence: 79%

Rare Hydrated Magnesium Carbonate Minerals Nesquehonite and Dypingite of the Obnazhennaya Kimberlite Pipe, in the Yakutian Kimberlite Province

Ugapeva,

Oleinikov,

Zayakina

2023

Minerals

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“…The difference is mainly due to the aerial adsorption of water molecules onto the MgO-based surfaces when they are exposed to the atmosphere where the sample under MF adsorbed more compared to the other two. The adsorption peak seen at the wavenumbers 1420 cm −1 , 1418 cm −1 , and 1432 cm −1 in all three samples can be assigned to the asymmetric stretching of the carbonate ion, which is of the CO 3 2− species [47]. In addition, a weak band corresponding to the adsorption of gas-phase CO 2 is visible at 2320 cm −1 , 2335 cm −1 , and 2318 cm −1 in all three samples [48,49].…”

Section: Structural and Morphological Characterizationmentioning

confidence: 77%

“…The sample under natural aging with no MF applied shows broader peaks for the stretching vibration mode for the Mg-O-Mg [44][45][46]. The stretching vibration of the O-H of water molecules and surface hydroxyl groups give rise to broad band in the region between 3378 cm −1 , 3417 cm −1 , and 3393 cm −1 in all three samples, yet the similar sample aged without MF shows a broad and less intensive peak related to the O-H stretching vibration (3393 cm −1 ) [47]. Two distinct bands are seen in the before-aging sample (1052 cm −1 and 1025 cm −1 ), aged sample under MF (1053 cm −1 and 1035 cm −1 ), and aged sample without MF (1031 cm −1 and 1024 cm −1 ), which are attributed to the bending vibration of absorbed water [44].…”

Section: Structural and Morphological Characterizationmentioning

confidence: 88%

Counter-Intuitive Magneto-Water-Wetting Effect to CO2 Adsorption at Room Temperature Using MgO/Mg(OH)2 Nanocomposites

Senevirathna

Weerasinghe

et al. 2022

Materials

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MgO/Mg(OH)2-based materials have been intensively explored for CO2 adsorption due to their high theoretical but low practical CO2 capture efficiency. Our previous study on the effect of H2O wetting on CO2 adsorption in MgO/Mg(OH)2 nanostructures found that the presence of H2O molecules significantly increases (decreases) CO2 adsorption on the MgO (Mg(OH)2) surface. Furthermore, the magneto-water-wetting technique is used to improve the CO2 capture efficiency of various nanofluids by increasing the mass transfer efficiency of nanobeads. However, the influence of magneto-wetting to the CO2 adsorption at nanobead surfaces remains unknown. The effect of magneto-water-wetting on CO2 adsorption on MgO/Mg(OH)2 nanocomposites was investigated experimentally in this study. Contrary to popular belief, magneto-water-wetting does not always increase CO2 adsorption; in fact, if Mg(OH)2 dominates in the nanocomposite, it can actually decrease CO2 adsorption. As a result of our structural research, we hypothesized that the creation of a thin H2O layer between nanograins prevents CO2 from flowing through, hence slowing down CO2 adsorption during the carbon-hydration aging process. Finally, the magneto-water-wetting technique can be used to control the carbon-hydration process and uncover both novel insights and discoveries of CO2 capture from air at room temperature to guide the design and development of ferrofluid devices for biomedical and energy applications.

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“…The presence of hydroxyls contained in unreacted Mg(OH) 2 and Ca(OH) 2 generates a strong IR signal at 3696 and 3650 cm –1 , respectively, due to the antisymmetric O–H stretching vibrations . Nesquehonite (MgCO 3 ·3H 2 O) is found to be the major carbonation products of MH and C–3M compacts, which can be verified by the presence of O–H bending at 1420, 1480, and 1645 cm –1 and C–O bending at 850 and 1105 cm –1 . Meanwhile, a small amount of calcite and magnesium calcite is formed as evidenced by the C–O bending at 875 and 713 cm –1 .…”

Section: Resultsmentioning

confidence: 99%

“…20 Nesquehonite (MgCO 3 •3H 2 O) is found to be the major carbonation products of MH and C−3M compacts, which can be verified by the presence of O−H bending at 1420, 1480, and 1645 cm −1 and C−O bending at 850 and 1105 cm −1 . 21 Meanwhile, a small amount of calcite and magnesium calcite is formed as evidenced by the C−O bending at 875 and 713 cm −1 . 22 A peak of O−H bending at 3696 cm −1 of carbonated compacts containing both Mg(OH) 2 and Ca(OH) 2 is noted, which is much lower than that of the MH compact, implying that the incorporation of Ca(OH) 2 promotes the carbonation of Mg(OH) 2 substantially, which is consistent with the DOC results in Figure 3.…”

Section: Compressive Strength and Doc Of Mh−ch Compactsmentioning

confidence: 99%

Elucidating the Interaction Mechanism of Mg(OH)₂ and Ca(OH)₂ under Enforced Carbonation

Zhang

Liu

Wang

et al. 2023

ACS Sustainable Chem. Eng.

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There is a potential for leveraging the synergy of carbonation of portlandite and Mg-based binders to improve the CO 2 uptake, mechanical property, and thermodynamic stability of Mg-and Ca-based binders and enable its application. This work reports insights into the carbonation behavior of Mg(OH) 2 −Ca(OH) 2 (MH−CH) mixtures including the precipitation of different carbonates, degree of reaction of each phase, mechanical properties, microstructure characterization, and thermodynamic stability. Results indicate that the compressive strength and degree of carbonation (DOC) of compacts increase first and then decrease with the increase of the Ca(OH) 2 content. The compact containing 25% Ca(OH) 2 yields the highest compressive strength of 91.4 MPa, while the compact containing 75% Ca(OH) 2 has the highest DOC of 91.2%. The formation of nesquehonite with a lower density in compacts with lower contents of Ca(OH) 2 (0 and 25%) results in a higher volume increase even at a very low DOC (14.2%), leading to a more densified structure in the compacts. Compacts with higher contents of Ca(OH) 2 (50, 75, and 100%) precipitate calcite and magnesium calcite with higher thermodynamic stability than nesquehonite and improved water stability. Meanwhile, the high temperature in the initial stage of Ca(OH) 2 carbonation causes severe water evaporation and insufficient water in compacts, thus restricting the continuous carbonation at the center having a lower DOC than the surface. The mixing of Mg(OH) 2 and Ca(OH) 2 significantly enhances the carbonation degree of both hydroxides, which may be explained by the complementation of Ca(OH) 2 and Mg(OH) 2 carbonation, in which the water released by the carbonation of Ca(OH) 2 is bound to the crystal structure of hydrated magnesium carbonates (HMCs) from Mg(OH) 2 carbonation.

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Mineralogical and Spectroscopic Study of Nesquehonite Synthesized by Reaction of Gaseous Co2 With Mg Chloride Solution

Cited by 6 publications

References 18 publications

Rare Hydrated Magnesium Carbonate Minerals Nesquehonite and Dypingite of the Obnazhennaya Kimberlite Pipe, in the Yakutian Kimberlite Province

Rare Hydrated Magnesium Carbonate Minerals Nesquehonite and Dypingite of the Obnazhennaya Kimberlite Pipe, in the Yakutian Kimberlite Province

Counter-Intuitive Magneto-Water-Wetting Effect to CO2 Adsorption at Room Temperature Using MgO/Mg(OH)2 Nanocomposites

Elucidating the Interaction Mechanism of Mg(OH)₂ and Ca(OH)₂ under Enforced Carbonation

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Mineralogical and Spectroscopic Study of Nesquehonite Synthesized by Reaction of Gaseous Co2 With Mg Chloride Solution

Cited by 6 publications

References 18 publications

Rare Hydrated Magnesium Carbonate Minerals Nesquehonite and Dypingite of the Obnazhennaya Kimberlite Pipe, in the Yakutian Kimberlite Province

Rare Hydrated Magnesium Carbonate Minerals Nesquehonite and Dypingite of the Obnazhennaya Kimberlite Pipe, in the Yakutian Kimberlite Province

Counter-Intuitive Magneto-Water-Wetting Effect to CO2 Adsorption at Room Temperature Using MgO/Mg(OH)2 Nanocomposites

Elucidating the Interaction Mechanism of Mg(OH)2 and Ca(OH)2 under Enforced Carbonation

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Elucidating the Interaction Mechanism of Mg(OH)₂ and Ca(OH)₂ under Enforced Carbonation