Continuous water adsorption states promoted by Ni 2+ confined in a synthetic smectite

Altoé, Mário Alberto Simonato; Michels, Leander; Santos, Everton dos; Droppa, R.; Grassi, Giovanni; Ribeiro, Luciano; Knudsen, Kenneth D.; Bordallo, Heloisa N.; Fossum, Jon Otto; Silva, Geraldo José da

doi:10.1016/j.clay.2016.01.012

Cited by 19 publications

(27 citation statements)

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“…LiFh was purchased from Corning Inc. NiFh and NaFh powder samples were obtained from the LiFh clay following a standard dialysis cation exchange protocol 32 with no further analysis. Water intercalation in NaFh and NiFh samples, originated from the same LiFh batch that we have studied here, have been investigated by NMR spectroscopy (NaFh 29 ), and TGA (NiFh 19 ). The cation coordination numbers proposed from these results are in full accordance with the clay layer charge reported by Kaviratna et al .…”

Section: Methodsmentioning

confidence: 99%

“…carbonates, (hydr)oxides, silica, and organic matter) than natural clays and show a more homogenous charge distribution than their natural counterparts 14 , leading to well-defined intercalation states 15 , 16 . Intercalation of water in nano-silicate smectite clays occurs naturally and has been extensively studied with a wide range of techniques, among them neutron 17 , 18 and X-ray scattering 13 , 19 . Recent experiments and simulations have shown that also CO 2 can intercalate in smectite clays, both in supercritical 20 , and in gaseous/liquid form 21 .…”

Section: Introductionmentioning

confidence: 99%

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A nano-silicate material with exceptional capacity for CO2 capture and storage at room temperature

Cavalcanti

Kalantzopoulos

Eckert

et al. 2018

Sci Rep

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In order to mitigate climate change driven by the observed high levels of carbon dioxide (CO2) in the atmosphere, many micro and nano-porous materials are being investigated for CO2 selectivity, capture and storage (CCS) purposes, including zeolites, metal organic frameworks (MOFs), functionalized polymers, activated carbons and nano-silicate clay minerals. Key properties include availability, non-toxicity, low cost, stability, energy of adsorption/desorption, sorbent regeneration, sorption kinetics and CO2 storage capacity. Here, we address the crucial point of the volumetric capture and storage capacity for CO2 in a low cost material which is natural, non-toxic, and stable. We show that the nano-silicate Nickel Fluorohectorite is able to capture 0.79 metric tons of CO2 per m3 of host material - one of the highest capacities ever achieved - and we compare volumetric and gravimetric capacity of the best CO2 sorbent materials reported to date. Our results suggest that the high capture capacity of this fluorohectorite clay is strongly coupled to the type and valence of the interlayer cation (here Ni2+) and the high charge density, which is almost twice that of montmorillonite, resulting in the highest reported CO2 uptake among clay minerals.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A nano-silicate material with exceptional capacity for CO2 capture and storage at room temperature

Cavalcanti

Kalantzopoulos

Eckert

et al. 2018

Sci Rep

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show abstract

“…The values of d-spacings, as well as dynamics of the transitions between hydration states, are strongly impacted by the nature of the cations that allow nanostackparticles to hold together. For fluorohectorite in particular, a number of hydration studies have been performed with different types of intercalated cations [19,28,[31][32][33]. Among them, recent studies have shown that the dynamics of H 2 O intercalation in LiFh (where the intercalated cation is Li + ) is markedly different from that in NaFh [24].…”

Section: Introductionmentioning

confidence: 99%

Water vapor diffusive transport in a smectite clay: Cationic control of normal versus anomalous diffusion

et al. 2019

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“…The first asymmetric endothermic signal is associated with the release of adsorbed water . It is observed at 93, 94, 104 and 114°C for the LS (Cl) neutral, LS (Cl) basic, LS(F) neutral and LS(F) basic, respectively.…”

Section: Resultsmentioning

confidence: 97%

Red‐ and green‐emitting nano‐clay materials doped with Eu³⁺ and/or Tb³⁺

et al. 2018

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Trivalent europium (Eu3+) and terbium (Tb3+) ions are important activator centers used in different host lattices to produce red and green emitting materials. The current work shows the design of new clay minerals to act as host lattices for rare earth (RE) ions. Based on the hectorite structure, nano‐chlorohectorites and nano‐fluorohectorites were developed by replacing the OH− present in the hectorite structure with Cl− or F−, thus avoiding the luminescence quenching expected due to the OH− groups. The produced matrices were characterized through X‐ray powder diffraction (XPD), transmission electron microscopy (TEM), FT‐IR, 29Si MAS (magic angle spinning) NMR, nitrogen sorption, thermogravimetry‐differential scanning calorimetry (TGA‐DSC) and luminescence measurements, indicating all good features expected from a host lattice for RE ions. The nano‐clay materials were successfully doped with Eu3+ and/or Tb3+ to yield materials preserving the hectorite crystal structure and showing the related luminescence emissions. Thus, the present work shows that efficient RE3+ luminescence can be obtained from clays without the use of organic ‘antenna’ molecules.

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Continuous water adsorption states promoted by Ni 2+ confined in a synthetic smectite

Abstract: 17The water adsorptions isotherms of the smectite Ni-fluorohectorite have been obtained from the 18 relative humidity dependence of X-ray diffraction intensities, and it was observed that the transitions 33

Cited by 19 publications

References 54 publications

A nano-silicate material with exceptional capacity for CO2 capture and storage at room temperature

A nano-silicate material with exceptional capacity for CO2 capture and storage at room temperature

Water vapor diffusive transport in a smectite clay: Cationic control of normal versus anomalous diffusion

Red‐ and green‐emitting nano‐clay materials doped with Eu³⁺ and/or Tb³⁺

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Continuous water adsorption states promoted by Ni 2+ confined in a synthetic smectite

Abstract: 17The water adsorptions isotherms of the smectite Ni-fluorohectorite have been obtained from the 18 relative humidity dependence of X-ray diffraction intensities, and it was observed that the transitions 33

Cited by 19 publications

References 54 publications

A nano-silicate material with exceptional capacity for CO2 capture and storage at room temperature

A nano-silicate material with exceptional capacity for CO2 capture and storage at room temperature

Water vapor diffusive transport in a smectite clay: Cationic control of normal versus anomalous diffusion

Red‐ and green‐emitting nano‐clay materials doped with Eu3+ and/or Tb3+

Contact Info

Product

Resources

About

Red‐ and green‐emitting nano‐clay materials doped with Eu³⁺ and/or Tb³⁺