Current Industrial Applications of Palygorskite and Sepiolite

Álvarez, Antonio Merchán; Santarén, Julio; Esteban‐Cubillo, Antonio; Aparicio, Patricia

doi:10.1016/b978-0-444-53607-5.00012-8

Cited by 86 publications

(45 citation statements)

References 7 publications

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“…As microorganisms intertwine with minerals in natural soils, especially the clay minerals which evolve simultaneously with the Table 2 Important clay minerals and their properties relevant to environmental applications (adapted from Álvarez et al (2011);Murray (2000); and Sarkar et al (2012b) former over many years (Huang, 2008;Dong and Lu, 2012), the integration of suitable clay mineral(s) with appropriate microorganism(s) could add a new dimension to the development of bio-reactive barrier or biofilter for contaminant remediation (Sarkar et al, 2012b). Clays, as the most dominant minerals and specifically in the clay-humic complexes, play a significant role in this interaction by providing a substrate and habitat for microorganisms.…”

Section: Clay Minerals-modulated Microbial Degradationmentioning

confidence: 99%

Bioremediation of PAHs and VOCs: Advances in clay mineral–microbial interaction

Biswas

Sarkar

Rusmin

et al. 2015

Environment International

120

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Section: Clay Minerals-modulated Microbial Degradationmentioning

confidence: 99%

Bioremediation of PAHs and VOCs: Advances in clay mineral–microbial interaction

Biswas

Sarkar

Rusmin

et al. 2015

Environment International

120

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“…These clays chemically correspond to hydrated magnesium silicates (formula Si 12 Mg 8 O 30 (OH) 4 (OH 2 ) 4 ·8H 2 O). Sepiolites present a needle-like morphology, with an average particle length ranging between 1 and 2 µm and a diameter in the nanometric range (between 20 and 30 nm) [38,39]. Three different sepiolites have been employed in this work: non-organically modified sepiolite (labelled from now on as S-N) and two superficially organomodified sepiolites.…”

Section: Methodsmentioning

confidence: 99%

PMMA-sepiolite nanocomposites as new promising materials for the production of nanocellular polymers

Bernardo

León

Laguna‐Gutiérrez

et al. 2017

European Polymer Journal

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A B S T R A C TIn this work, a new system based on poly(methyl methacrylate) (PMMA) sepiolite nanocomposites that allow producing nanocellular polymers by using the gas dissolution foaming technique is described. Nanocomposites with different nanoparticle types and contents have been produced by extrusion. From these blends, cellular materials have been fabricated using the so-called gas dissolution foaming method. An extensive study of the effect of the processing parameters (saturation pressure and foaming temperature) on the cellular materials produced has been performed. Results showed that among the three sepiolites used, only those modified with a quaternary ammonium salt are suitable for being used as nucleating agents in PMMA. With these nanoparticles bimodal cellular polymers, with micro and nanometric cells, have been produced. Cell sizes in the range of 300-500 nm and cell densities of the order of 10 13 -10 14 nuclei/cm 3 have been obtained in the nanocellular region. A foaming temperature of 80°C and a wide range of saturation pressures (between 10 and 30 MPa) and low particle contents (between 0.5 and 1.5 wt%) allow obtaining these materials. Furthermore, it has been found that cell size in the nanometric population can be controlled by means of the particles content; a reduction in the cell size is obtained when the particles content increases. Finally, results indicate that an increase in the foaming temperature leads to cellular nanocomposites with lower relative densities (below 0.21) and larger cell sizes (above 450 nm).

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“…Sepiolite has various and useful industrial applications such as lubricant, catalyst, adsorbent, cleaning compress for restoration and cat litter (Àlvarez et al, 2011;Lòpez-Galindo et al, 2011). In addition sepiolite may be used as an asbestos substitute in building and seal materials, friction compounds for automotive brakes and high temperature insulators (Noda et al, 2009;Solebello, 2009) due to its habit and modest fibre length.…”

Section: Introductionmentioning

confidence: 99%

Asbestiform sepiolite coated by aliphatic hydrocarbons from Perletoa, Aosta Valley Region (Western Alps, Italy): characterization, genesis and possible hazards

Giustetto

Seenivasan²,

Belluso

2014

Mineral. mag.

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An atypical asbestiform sepiolite occurrence with exceptionally long fibres wrapped by a sheath of aliphatic hydrocarbons was found in the Gressoney Valley (Italian Western Alps) while monitoring asbestos presence in outcrops of serpentinite rocks. Microscopic and Fourier transform infrared analyses proved that these fibres, apparently up to several cm long, are formed by bundles of thinner fibrils (average length: 150 μm) potentially dispersible in the environment. When observed using transmission electron microscopy these fibrils show a rhomboidal to parallelogram cross section (<1 μm), of which surfaces are covered mostly by an aliphatic hydrocarbon film – an association not reported in the literature. The sepiolite fibrils and their organic coating probably originated in sequential steps from precipitation of Si/Mg rich hydrothermal fluids, resulting from serpentinization of olivine and clinopyroxene and a Fischer-Tropsch-type reaction. The presence of hydrocarbons has serious implications for the sepiolite habit, as the organic wrap interacts with the fibril’s surface reducing the amount of adsorbed water and favouring the fragmentation of thicker units into thinner ones, due to an ‘opening’ process implying separation along z and cleavage on (110). This defibrillation mechanism, coupled with the extraordinary length, further increases the aspect ratio of these fibrils (length/width ≫3) thus amplifying their potential danger for human health when dispersed in air and inhaled.

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Current Industrial Applications of Palygorskite and Sepiolite

Cited by 86 publications

References 7 publications

Bioremediation of PAHs and VOCs: Advances in clay mineral–microbial interaction

Bioremediation of PAHs and VOCs: Advances in clay mineral–microbial interaction

PMMA-sepiolite nanocomposites as new promising materials for the production of nanocellular polymers

Asbestiform sepiolite coated by aliphatic hydrocarbons from Perletoa, Aosta Valley Region (Western Alps, Italy): characterization, genesis and possible hazards

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