Effects of exchanged cation, acid treatment and high shear mechanical treatment on the swelling and the particle size distribution of vermiculite

Chambi-Peralta, Marvin Marco; Coelho, A. C. Vieira; Carvalho, Flávio; Toffoli, Samuel Márcio

doi:10.1016/j.clay.2017.12.049

Cited by 20 publications

(4 citation statements)

References 46 publications

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“…75−77 To maintain charge balance, the interlayer region between the parallel layers accommodates water molecules and weakly bonding exchangeable monovalent or divalent cations. 75 These cations compensate for the positive charge deficiency resulting from the aluminum substitution. 78 Notably, vermiculite lamellar membranes exhibit remarkable thermal stability, retaining high proton conductivity even after exposure to temperatures as high as 500 °C in an air environment.…”

Section: Design Concept Of Biomimetic Nanochannelsmentioning

confidence: 99%

“…This structure consists of octahedral layers containing magnesium ions (Mg 2+ ) sandwiched between tetrahedral silicate layers on either side . The negative charge of vermiculite arises from the substitution of aluminum (Al 3+ ) for some silicon (Si) atoms within the tetrahedral layers. − To maintain charge balance, the interlayer region between the parallel layers accommodates water molecules and weakly bonding exchangeable monovalent or divalent cations . These cations compensate for the positive charge deficiency resulting from the aluminum substitution .…”

Section: Design Concept Of Biomimetic Nanochannelsmentioning

confidence: 99%

See 1 more Smart Citation

Biomimetic Two-Dimensional Composited Membranes for Ion Separation and Desalination

Cao,

Xie,

et al. 2023

Ind. Eng. Chem. Res.

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Inspired by cell membranes, with high efficiency and precision separation for water and ions, development of biomimetic membranes using two-dimensional (2D) materials and responsive molecules/macromolecules has been emerging. Herein, this review overviews the recent development of biomimetic 2D composited membranes integrating 2D materials and the responsive subunits for water and ion separation. The review highlights the design concepts and various fabrication strategies, such as coating, layer-by-layer (LBL) assembly, electrochemical deposition, and filtration. The biomimetic 2D composited membranes are preliminarily achieved for adjustable ion separation and desalination. The challenges with biomimetic 2D composite membranes are also discussed, including the intricate mass transfer mechanisms and stability during operation. With the exceptional functionalities offered by angstrom-scale 2D nanochannels, biomimetic 2D composite membranes hold great potential in shaping the future of cutting-edge separating membranes, opening new avenues for advanced separation technologies.

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Section: Design Concept Of Biomimetic Nanochannelsmentioning

confidence: 99%

Section: Design Concept Of Biomimetic Nanochannelsmentioning

confidence: 99%

Biomimetic Two-Dimensional Composited Membranes for Ion Separation and Desalination

Cao,

Xie,

et al. 2023

Ind. Eng. Chem. Res.

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“…X-ray patterns of KORO (Figure 9) (Caglar et al, 2009;Chambi-Peralta, 2018;Monteiro., 2018). It was also evidenced with montmorillonite-copper solutions (Eren E. et al, 2008).…”

Section: X-ray Diffraction Of Koro Claymentioning

confidence: 99%

A study of adsorption of cadmium, copper and lead by two clays from Burkina Faso

Sorgho¹,

Guel²,

Zerbo³

et al. 2019

Int. J. Bio. Chem. Sci

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Water pollution caused by natural and anthropogenic causes become a major problem for many countries around the world in trying to find adequate and accessible means of treating polluted water. For more than a decade, research is focused on local adsorbent materials such as clays. It is in this dynamic that two clays extracted in Burkina Faso and referenced KORO and SIT were used to evaluate their capacities to reduce the content of heavy metals in aqueous solutions simulating waste water. The monitoring of the removal processes uses electrochemical characterizations, as voltammetry, evidencing a removal degree of heavy metals exceeding 90%. Characterizations of the process were also obtained by X-ray diffraction, Infrared Spectroscopy and Scanning Electron Microscopy. It is shown that the removal process occurs through the formation of clay-heavy metals complexes with both KORO and SIT. The three major mechanisms that were evidenced are complexation, ion-exchange and precipitation.

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“…The occurrence of iron in the mineral is also important, as it determines the surface area achieved after acid treatment. The final product is solid support with high SiO 2 content, with a high specific surface area, and Brønsted and Lewis surface acidity [22]. Acid-activated clays are generally used as adsorbents in vegetable, animal, wine, and beer industries, and are also used as catalysts in several organic reactions [23].…”

Section: Introductionmentioning

confidence: 99%

Acid matrix production from treated natural vermiculite-hydrobiotite

et al. 2021

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Given the potential of acid-activated clays in adsorptive and catalytic processes, several studies focusing on acid matrices have grown over the years, making it possible to study vermiculite, a mineral composed of a type 2:1 unit cell with tetrahedral and octahedral sheets. Therefore, this work aimed to study vermiculite treated with acids for the production of matrices. In this work, the treatment of natural vermiculite-hydrobiotite, with nitric acid in concentrations of 0.25, 0.50, 0.75, and 1 mol.L -1 , followed by the dealumination process with sulfuric acid 25% v/v, aiming the production of acid matrices for applications as support for biocatalysts, chemical adsorbents, among others. The produced materials were characterized using different techniques, including X-ray fluorescence spectroscopy, X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, and isotherm adsorption using the BET method. The results showed that after acid leaching the vermiculite showed a high SiO 2 content, high Brønsted and Lewis surface acidity, good adsorption/desorption performance, and significant growth of the specific surface area, qualifying the vermiculite as a promising material for future applications in catalytic and biocatalytic processes. The acid concentration had a considerable influence on the compositional and textural modification of vermiculite-hydrobiotite.

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Effects of exchanged cation, acid treatment and high shear mechanical treatment on the swelling and the particle size distribution of vermiculite

Cited by 20 publications

References 46 publications

Biomimetic Two-Dimensional Composited Membranes for Ion Separation and Desalination

Biomimetic Two-Dimensional Composited Membranes for Ion Separation and Desalination

A study of adsorption of cadmium, copper and lead by two clays from Burkina Faso

Acid matrix production from treated natural vermiculite-hydrobiotite

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