Spontaneous formation of an ordered interstratification upon Ni-exchange of Na-fluorohectorite

Loch, Patrick; Hunvik, Kristoffer William Bø; Puchtler, Florian; Weiß, Sebastian; Seljelid, Konstanse Kvalem; Røren, Paul Monceyron; Rudić, Svemir; Raaen, S.; Knudsen, Kenneth Dahl; Bordallo, Heloisa N.; Fossum, Jon Otto; Breu, Josef

doi:10.1016/j.clay.2020.105831

Cited by 10 publications

(32 citation statements)

References 54 publications

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“…Cation exchange of the noncondensed Ni 2+ interlayer cations with long-chain n -alkylammonium (C16, C 16 H 33 NH 3 Cl) led to a clearly visible superstructure as observed by PXRD. 30 This procedure was used to identify a comparable condensed species and a possible superstructure in Ni-Hec 0.7 and Ni-Hec 0.3 .…”

Section: Resultsmentioning

confidence: 99%

“…and then dried at 80 °C. The composition of Ni-Hec x ( x = 0.3 and 0.7) was determined via inductively coupled plasma atomic emission spectroscopy (ICP-OES) according to Loch et al, 30 comparing the Ni content of the pristine and C16-exchanged Ni-Hec x . Approximately 20 mg of Ni-Hec x equilibrated at a relative humidity of 43% was weighed into 15 mL clean Teflon flasks.…”

Section: Materials and Methodsmentioning

confidence: 99%

“…Ni-Hec has recently been shown to form a corrensite-like structure, with an ordered interstratifaction of chlorite-like layers with a composition of [Ni(OH) 0.83 (H 2 O) 1.17 ] 0.37 1.17+ , and hydrated smectite-like layers with Ni 2+ cations. 30 For this clay mineral, the hydration follows an atypical, partly continuous swelling behavior, which is related to the chlorite-like phase in the interlayer. 30 , 31 The chlorite-like phase has also been demonstrated to be responsible for CO 2 adsorption, where the molecules form a reversible bond with the intercalated nickel hydroxide.…”

Section: Introductionmentioning

confidence: 97%

“… 30 For this clay mineral, the hydration follows an atypical, partly continuous swelling behavior, which is related to the chlorite-like phase in the interlayer. 30 , 31 The chlorite-like phase has also been demonstrated to be responsible for CO 2 adsorption, where the molecules form a reversible bond with the intercalated nickel hydroxide. 14 The CO 2 could be grafted as a bicarbonate to the condensed nickel hydroxide species.…”

Section: Introductionmentioning

confidence: 97%

“…The samples were dried to at least 120 °C to ensure the removal of interlayer water and water coordinated to uncondensed interlayer cations, while preserving the clay layers and the nickel hydroxide in the chlorite-like layers. 30 The experimental measurements are supported by first-principles calculations performed within the density functional theory (DFT) approach.…”

Section: Introductionmentioning

confidence: 99%

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CO₂ Adsorption Enhanced by Tuning the Layer Charge in a Clay Mineral

et al. 2021

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Due to the compact two-dimensional interlayer pore space and the high density of interlayer molecular adsorption sites, clay minerals are competitive adsorption materials for carbon dioxide capture. We demonstrate that with a decreasing interlayer surface charge in a clay mineral, the adsorption capacity for CO 2 increases, while the pressure threshold for adsorption and swelling in response to CO 2 decreases. Synthetic nickel-exchanged fluorohectorite was investigated with three different layer charges varying from 0.3 to 0.7 per formula unit of Si 4 O 10 F 2 . We associate the mechanism for the higher CO 2 adsorption with more accessible space and adsorption sites for CO 2 within the interlayers. The low onset pressure for the lower-charge clay is attributed to weaker cohesion due to the attractive electrostatic forces between the layers. The excess adsorption capacity of the clay is measured to be 8.6, 6.5, and 4.5 wt % for the lowest, intermediate, and highest layer charges, respectively. Upon release of CO 2 , the highest-layer charge clay retains significantly more CO 2 . This pressure hysteresis is related to the same cohesion mechanism, where CO 2 is first released from the edges of the particles thereby closing exit paths and trapping the molecules in the center of the clay particles.

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Section: Resultsmentioning

confidence: 99%

Section: Materials and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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CO₂ Adsorption Enhanced by Tuning the Layer Charge in a Clay Mineral

et al. 2021

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Excimer formation in a 2D confined space

Matejdes,

Škorňa,

Slaný

et al. 2024

Materials Today Chemistry

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The Impact of Thermal History on Water Adsorption in a Synthetic Nanolayered Silicate with Intercalated Li⁺ or Na⁺

et al. 2020

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For applications benefitting from the swelling properties of nanolayered silicates (clay minerals), it is of paramount importance to understand the hysteresis in the clay−water interaction. In this context, the present work investigates how the thermal history of Na + -and Li + -intercalated fluorohectorite affects the hydration process. By combining X-ray diffraction and thermogravimetric analysis, water adsorption of preheated and non-preheated fluorohectorite was measured and analyzed in terms of the characteristic interlayer distance. The number of water molecules per cation was also inferred. We find that some of the hydration states in preheated samples are suppressed, and transitions to higher hydration states are achieved at higher relative humidity values. This could be due to the initial water content that facilities crystalline swelling. However, the data for Li-fluorohectorite do not exclude the possibility of a low temperature Hofmann−Klemen effect at 150 °C. Our study also provides strong hints that the so-called 1.5 water layer state, observed in previous studies on smectites, is a metastable state. In addition, the impact of a hydrogenous structure in the interlayer space of Li-fluorohectorite on the clay's hydration behavior is demonstrated. The results, if generalized, would have strong implications on a wide range of applications, where the thermal history of smectites is important.

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Spontaneous formation of an ordered interstratification upon Ni-exchange of Na-fluorohectorite

Cited by 10 publications

References 54 publications

CO₂ Adsorption Enhanced by Tuning the Layer Charge in a Clay Mineral

CO₂ Adsorption Enhanced by Tuning the Layer Charge in a Clay Mineral

Excimer formation in a 2D confined space

The Impact of Thermal History on Water Adsorption in a Synthetic Nanolayered Silicate with Intercalated Li⁺ or Na⁺

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Spontaneous formation of an ordered interstratification upon Ni-exchange of Na-fluorohectorite

Cited by 10 publications

References 54 publications

CO2 Adsorption Enhanced by Tuning the Layer Charge in a Clay Mineral

CO2 Adsorption Enhanced by Tuning the Layer Charge in a Clay Mineral

Excimer formation in a 2D confined space

The Impact of Thermal History on Water Adsorption in a Synthetic Nanolayered Silicate with Intercalated Li+ or Na+

Contact Info

Product

Resources

About

CO₂ Adsorption Enhanced by Tuning the Layer Charge in a Clay Mineral

CO₂ Adsorption Enhanced by Tuning the Layer Charge in a Clay Mineral

The Impact of Thermal History on Water Adsorption in a Synthetic Nanolayered Silicate with Intercalated Li⁺ or Na⁺