Introduction. Sepiolite as well as palygorskite are one-dimensional (1D) microfibrous silicates belonging to the clay minerals family. They exhibit unique structural and textural characteristics that determine their use in diverse applications from industrial adsorbents to rheological additives (Álvarez et al., 2011).Recently, sepiolite has …
Sepiolite (ST) was used as a supporting matrix in compiste phase change materials (PCMs) due to its unique microstructure, good thermal stability, and other raw material advantages. In this paper, microwave acid treatment were innovatively used for the modification of sepiolite. The modified sepiolite (STm) obtained in different …
Cadmium ion (Cd2+) is one of the harmful metal ions in the wastewater and has attracted much attention for its removal. The current study proposes a low-cost adsorbent MnO2-sepiolite to capture Cd2+ from the aqueous solutions. The structure of the new MnO2-sepiolite adsorbent was characterized by using nitrogen …
The width of the structural blocks and, consequently, the width of the tunnels and the channels are different in both clay minerals. The dimensions of the channels are for sepiolite 1.06 × 0.37 nm, whereas for palygorskite, they are 0.64 × 0.37 nm (Ruiz-Hitzky et al., 2004).Therefore, both are nanoporous microcrystalline solids exhibiting elevated …
Numerous investigations were performed to decide different properties of Sepiolite strengthened polymer composites in various applications, for example, tensile strength, flexural strength, impact strength, stiffness, thermal, flammability, thermo …
The morphology of sepiolite powders is composed of small micro fibrous porous bundles and, furthermore, ZnO nano-composites are placed as consolidated on the sepiolite structure. After sulfur was infused, the particles uniformly dispersed and observable aggregations appeared owing to thermal treatment ( Figure S1 ).
Abstract Sepiolite fiber-reinforced silica aerogel com-posites for thermal insulators were prepared by dispersing sepiolite fiber in silica sol, aging, solvent exchanging, and …
of the sepiolite/silica aerogel composite involves four major steps: (1) the preparation of the silica sol, using nitric acid to prevent precipitation; (2) dispersing the surface treated sepiolite fiber in the silica sol to prepare homoge-neous sepiolite fiber suspension; (3) preparing the alcogel
The palygorskite-sepiolite group of clay minerals has a wide range of industrial applications derived mainly from its sorptive, rheological and catalytic properties which are based on the fabric, surface area, porosity, crystal morphology, structure and composition of these minerals. For assessing potential industrial uses, the mineralogical ...
Sepiolite is a natural layered silicate with high absorbency. The fine, yellowish-white filler swells when water is absorbed. Downloads. Details 58945e.pdf. Technical Data Chemical description: Sepiolite, CAS No. 6, EINECS 264-465-3; Suitability: Acrylics, Ceramic, Tempera, Watercolor / Gouache;
Reviews in Mineralogy and Geochemistry (1988) 19 (1): 631–674. Article history. First Online:
Sepiolite (Si 12 Mg 8 O 30 (OH,F) 4].(H 2 O) 4 ·8H 2 O) is a valuable filler with an enormous capacity to be used in thermoplastic composites, substituting costly reinforcing fillers, such as graphene and CNTs. Sepiolite strengthened polymers nanocomposite materials have encouraged the field of research and ventures because …
Sepiolite (SEP) is a typically natural clay minerals with fiber shape and contains a continuous tetrahedral sheet, which is similar to other types of silicate minerals (Serna et al., 1975). However, it also differs from other layered silicates because it lacks a continuous octahedral sheet.
Sepiolite is the hydrated magnesium silicate [(Si 12)(Mg 9)O 30 (OH) 6 (OH 2) 4 H 2 O] belonging to phillo-silicates. The structure of this mineral is formed by alternate building of blocks and tunnels, which grow up in the fiber direction. Each structural block is composed of two tetrahedral silica sheets sandwiching the central sheet of ...
Adsorption of Cu(II) by sepiolite samples was investigated as a function of the initial Cu(II) concentration, solution pH, ionic strength, temperature and the presence of an inorganic ligand (Cl −). Changes in the surface and structure were characterized by means of XRD, IR and N 2 gas adsorption data.
Sepiolite is a natural hydrated magnesium silicate clay mineral with a micro fibrous morphology and good sorptive property. Brauner and Preisinger 15 deduced the structure of the sepiolite by...
The sintering activation energy of porous sepiolite ceramics was measured by step isothermal thermal expansion with a value of 791.42 kJ/mol in the range of 1000 °C to 1200 °C. ...
Sepiolite is a hydrated magnesium silicate with a microfibrous morphology and a particular texture that provides a high specific surface area. Together with …
Sepiolite is a hydrated magnesium silicate with a microfibrous morphology and a particular texture that provides a high specific surface area. Together with palygorskite, it forms the palygorskite–sepiolite series. The usual settings for sepiolite occurrences...
Three TTB sepiolite muds with different salt content in their liquid phase were formulated to determine rheological and fluid loss properties in ambient conditions.
On heating, sorbed water molecules are removed causing changes in the pore size distribution. In this study, the effects of thermal treatment on the pore structure of sepiolite and the acid-treated sepiolite samples were investigated. The solid density of sepiolite, measured by a He displacement technique, was 2.08 g cm-3 and total …
The ability of Na+-, Li+-, K+-, Ca2+- and Mg2+-exchanged sepiolites and acid-activated sepiolites to remove ethylene from storage environments.
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The global Sepiolite market was valued at US$ 19 million in 2023 and is anticipated to reach US$ 26 million by 2030, witnessing a CAGR of 4.7% during the forecast period 2024-2031.
The sepiolite raw material was purchased from the Liuyang Sepiolite Mining Industry Company of China. The support was prepared using sodium-leached sepiolite. The modification of sepiolite with sodium is expected to improve the thermal stability and cation exchange capacity of the sample, without altering the original structure of the …
The main difference among those nanocomposites is due to the sepiolite content, and thus, the isotherms corresponding to compositions with 20% w/w of sepiolite are closer to that of MCC alone. Those samples with low sepiolite loadings and prepared at applied energies of 20 kJ or higher also showed better water vapor transmission rates …
After dispersing the sepiolite fibres in water for 30 min, 16.16 g Fe(NO 3) 3 ⋅9H 2 O was added to the water-bearing sepiolite and left in the ultrasonic bath for 1 h. To co-precipitate iron and the sepiolite, 10 M NaOH was droppered into the beaker until the pH equalled 10.0, and this was again kept in an ultrasonic bath for 1 h.
Thallium, a highly toxic trace element, being released into the environment by industrial mining has caused serious environmental pollution. Here, a magnetic Prussian Blue (PB) nanosorbent loading on sepiolite (PB/Fe 3 O 4 /SEP) was successfully synthesized for the deep treatment of Tl(I) based on its high adsorption capacity. The …
AbstractSelection of proper drilling fluid is recognized as a challenging process in high temperature environments. Therefore, chemical and physical properties of drilling mud should be suitable at high temperatures to minimize mud and borehole instabilities. This study is aimed to characterize rheological and filtration properties of …
The structure and properties of sepiolite are reviewed. Surface properties, such as porosity and sorption are detailed, as well as dehydration and thermal behaviour.
Sepiolite, (German: "sea-"), a fibrous hydrated magnesium silicate, Mg4Si6O15(OH)2·6H2O, that is opaque and white, grey, or cream in colour. It may resemble the bones of the cuttlefish Sepia, from which the name derives. In the Black Sea region, where the light, porous clay mineral is abundant,
Sepiolite [Mg4Si6O15(OH)2·6H2O] is a ctahedral 2:1 Mg-silicate that has been often used to reconstruct the evolution of sedimentary environments and facies in the …
From TEM analysis (e.g. Fig. 4, Fig. 5) performed on each sepiolite powder a several representative micrographs were taken into account to perform a digital image analysis (on an average of 200 needles), in order to evaluate the dimension of the sepiolite fibres.TEM analysis, performed at low magnification on both pristine (Fig. 4 a) and …
A compositional gap between sepiolite and palygorskite has long been accepted even though they have similar structures, but recent studies found that such a gap does not exist and that the compositional series is continuous between them. If this is true, intergrowths between these two minerals should exist. The purpose of the present study …
جذب سطحی توسط جاذب های طبیعی مغناطیسی به دلیل ارزانی، دسترسی زیاد ، نداشتن خطرات زیست محیطی و قابلت جداسازی از محیط توسط میدان مغناطیسی روشی مناسب برای حذف رنگ از پساب های صنعتی می باشد. در این تحقیق خاک رس سپیولایت ...
Micropore distribution and effective size of the channels of natural sepiolite from Turkey were measured by the BET method. Before the BET measurement, the samples were treated under a water vapour atmosphere at various pressures to fill progressively the sepiolite micropores with water.
Organo-mineral derivatives of sepiolite and palygorskite are of great interest to industry, because they have the surface and reactive properties of the grafted organic molecules …
