The role of magnesium on the stability of crystalline sepiolite structure

Esteban‐Cubillo, Antonio; Pina-Zapardiel, R.; Moya, José S.; Barba, M. F.; Pecharromán, Carlos

doi:10.1016/j.jeurceramsoc.2007.11.022

Cited by 69 publications

(31 citation statements)

References 22 publications

(22 reference statements)

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“…The samples prepared did not have any added divalent ions but by using atomic emission spectroscopy Esteban-Cubillo et al, showed that over time sepiolite will leach magnesium into the surrounding environment. The structure of sepiolite was still stable with small levels of magnesium voids [22]. The same process was observed by Charnay on samples of talc (a mineral similar to sepiolite) mixed with NaPAA.…”

Section: Polymer Adsorptionsupporting

confidence: 78%

Isotropic–nematic phase transition in aqueous sepiolite suspensions

Woolston

Duijneveldt

2015

Journal of Colloid and Interface Science

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Aqueous suspensions of sepiolite clay rods in water tend to form gels on increase of concentration. Here it is shown how addition of a small amount (0.1% of the clay mass) of a common stabiliser for clay suspensions, sodium polyacrylate, can allow the observation of an isotropic-nematic liquid crystal phase transition. This transition was found to move to higher clay concentrations upon adding NaCl, with samples containing 10(-3) M salt or above only displaying a gel phase. Even samples that initially formed liquid crystals had a tendency to form gels after several weeks, possibly due to Mg(2+) ions leaching from the clay mineral.

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Section: Polymer Adsorptionsupporting

confidence: 78%

Isotropic–nematic phase transition in aqueous sepiolite suspensions

Woolston

Duijneveldt

2015

Journal of Colloid and Interface Science

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“…3 shows FTIR spectra of sepiolite (a), modified sepiolite (b), and modified sepiolite/TEPA(c). The sepiolite band at 1655 cm À 1 is attributed to stretching vibrations of water molecules which are bonded to Mg 2 + cations located at the edges of the octahedral layer [41]. After acid treatment, this band disappeared as expected.…”

Section: Co 2 Sorption and Regeneration Experimentssupporting

confidence: 51%

Modified nanosepiolite as an inexpensive support of tetraethylenepentamine for CO2 sorption

et al. 2015

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“…2, it can be seen that the specific surface areas of sepiolite reached the maximum at the Mg 2+ removal of about 53%, which was 383 m 2 /g. Similar observations were reported by Esteban-Cubillo [30] and Sabah et al [31].…”

Section: Acid and Heat Treatment Of Sepiolitesupporting

confidence: 90%

Removal of tungsten from electroplating wastewater by acid- and heat-treated sepiolite

Wang

Chen

et al. 2014

Desalination and Water Treatment

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In this study, the removal of tungsten from electroplating wastewater by adsorption on sepiolite has been investigated. To improve its performance, the natural sepiolite, was treated using H 2 SO 4 , followed by a heat treatment. The results obtained from the adsorption experiments showed that the acid-and heat-treated sepiolite had much higher adsorption for tungsten compared to the untreated (natural) sepiolite. The pH and temperature were important parameters in the adsorption process: the tungsten adsorption onto the acid-and heat-treated sepiolite increased at a lower pH and higher temperature, and the maximum adsorption capacity of 48.3 mg/g was obtained at pH 4.0, 55˚C, initial concentration of tungsten of 300 mg/L, and the sepiolite to liquid ratio of 0.5 g/100 mL. The acid-and heattreated sepiolite was applied to electroplating industrial wastewater containing 265 mg/L tungsten, under the conditions of pH ≤ 6, 25-55˚C, more than 98% of tungsten was removed. It was concluded that the acid-and heat-treated sepiolite is a potential adsorbent that can be commercially used to remove the residual tungsten in industrial wastewater.

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The role of magnesium on the stability of crystalline sepiolite structure

Cited by 69 publications

References 22 publications

Isotropic–nematic phase transition in aqueous sepiolite suspensions

Isotropic–nematic phase transition in aqueous sepiolite suspensions

Modified nanosepiolite as an inexpensive support of tetraethylenepentamine for CO2 sorption

Removal of tungsten from electroplating wastewater by acid- and heat-treated sepiolite

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