Showing papers in "Applied Clay Science in 2008"

TL;DR: In this article, the authors give an overview of properties, synthesis and applications of bentonite and polymer nanocomposites and describe the research performed until the present moment, including different synthesis techniques, modifications with several chemical compounds as quaternary alkylammonium salts and also biomolecules as enzymes that provide applicability in a variety of fields.

TL;DR: In this paper, the preparation and characterization of intercalation compounds of Mg-Al layered double hydroxide (Mg−Al LDH) and various organic surfactants have been studied in detail.

TL;DR: In this article, the adsorption of tetracycline (TC) on a Patagonian montmorillonite is studied as a function of pH, ionic strength and TC concentration by using X-ray diffraction, UV-Visible spectroscopy, ATR-FTIR spectrographs, batch experiments and adsorsorption modeling.

TL;DR: In this paper, the adsorption of Pb(II) from aqueous solution to MX-80 bentonite was studied using batch technique under ambient conditions, where removal percent and distribution coefficient (Kd) were determined as a function of shaking time, pH, ionic strength and temperature.

TL;DR: In this article, the authors investigated the influence of initial dry density and water content on the swelling pressure and swelling deformation of a compacted bentonite in a nuclear waste repository.

TL;DR: In this article, the behavior of vermiculite and montmorillonite toward adsorption of Cd2+, Pb2+, Zn2+, Mn2+, Cu2+ and Zn 2+ was compared.

TL;DR: In this article, the authors reported the fabrication of stable low cost mesoporous membranes deploying subsequent formulations based on kaolin and other suitable low cost materials such as quartz, sodium carbonate, calcium carbonate and sodium metasilicate.

TL;DR: In this paper, a thermal probe based on the hot wire method was used to measure the thermal conductivity of compacted bentonite specimens and the experimental results were analyzed to observe the effects of various factors (i.e. dry density, water content, hysteresis, degree of saturation and volumetric fraction of soil constituents).

TL;DR: The effect of different variables, namely, concentration of metal ions, amount of clay adsorbents, pH, time and temperature of interaction was investigated in this paper, and the equilibrium time was 300, 240 and 180min for Fe(III), Co(II) and Ni(II), respectively, the processes conforming to second order kinetics.

TL;DR: In this article, the thermal stability of synthesized and commercial organically modified montmorillonites has been investigated using thermogravimetric analysis (TGA) using Fourier transform infrared spectroscopy (FTIR).

TL;DR: In this paper, the effect of initial dye concentration, initial solution pH and temperature on the amount of dye adsorbed at equilibrium was evaluated using Response Surface Methodology (RSM) and Box-Behnken design.

TL;DR: In this article, a co-precipitation of chlorides, characterized and evaluated for their fluoride adsorption at room temperature from aqueous solutions, was used to obtain the equilibrium data for the Freundlich, Langmuir, and Temkin equations.

TL;DR: In this paper, a wide angle X-ray diffraction (WAXD) and thermogravimetric analysis (TGA) technique was used to characterize the structure and thermal stability of organo-montmorillonites (OMMT) clays.

TL;DR: In this article, the curability, mechanical properties, microstructure and the thermal stability of a variety of composites based on nanokaolin were studied using vulcanization techniques, mechanical testing, thermogravimetric analysis (TGA), transmission electron microscopy (TEM) and X-ray diffraction (XRD).

TL;DR: In this paper, the adsorption of Th(IV) on MX-80 bentonite as a function of pH, ionic strength, and temperature was studied by using batch technique.

TL;DR: In this article, the effect of chemical composition and molecular weight of the salts on the thermal stability and basal spacing of the phosphonium montmorillonites was evaluated. And the results showed that they exhibit higher thermal stability than conventional ammonium organoclays.

TL;DR: In this article, the effect of pH, ionic strength, solid content, humic acid (HA), fulvic acid (FA), and the addition sequences of fulvic acids/Ni2+/montmorillonite on Ni2+ adsorption was investigated.

TL;DR: The organo-bentonite was modified with cetylpyridinium bromide (CPBr) and investigated by elemental analysis, IR, X-ray diffraction, thermogravimetric analysis, specific surface area (BET) and electrokinetic mobility measurements as mentioned in this paper.

TL;DR: In this article, a modified montmorillonite was used to obtain transparent nanocomposite coatings characterized by a mixed intercalated/exfoliated structure and better thermal and scratch resistance performances.

TL;DR: In this paper, the behavior of ceramic clays from the area around Castellon (Spain) having a large ceramic industry was studied by using X-ray diffraction and the results from the study of mineralogical transformations show the persistence of illite up to at least 900°C.

TL;DR: A synergistic effect was observed between montmorillonite and a novel intumescent flame retardant, poly (4, 4-diaminodiphenyl methane spirocyclic pentaerythritol bisphosphonate) (PDSPB) in ABS nanocomposites as mentioned in this paper.

TL;DR: The adsorption capacity reached as high as 21 g/kg for Cr(VI, or 400 mmol/kg of chromate as discussed by the authors, and the enthalpy change was 9.4 kJ/mol.

TL;DR: A clay-drug nanohybrid was prepared by interfacial boundary ion exchange reaction, from which the release mechanism of a poorly water soluble drug, itraconazole, was studied systematically.

TL;DR: In this paper, three bentonites from different sources in Argentina, which have very different aflatoxins (AFs) adsorption capacity, were studied, and the characterization comprises chemical analysis, scanning electron microscopy (SEM), X-ray power diffraction (XRD), Hg intrusion porosimetry, swelling capacity, etc.

TL;DR: In this paper, the authors used transmission electron microscopy (TEM) to describe defect structures contained within individual fibers of palygorskite-sepiolite minerals.

TL;DR: In this paper, the adsorption of humic and fulvic acids onto intercalated layered double hydroxides with Mg/Al ratios ranging from 85/15 to 60/40 was studied by adaption isotherms at different ionic strengths and the characterization of the preferentially adsorbed humic substance size fractions.

TL;DR: In this paper, a novel nanohybrid material was prepared by functionalization of the interlayer space of kaolinite, using a triethanolamine intercalated with dimethylsulfoxide as starting material.

TL;DR: In this paper, the results of various analyses and ceramic aptitude tests made on two representative clay samples from Djebel Oust on Northwest of Tunisia were analyzed and the results revealed that an amount of silica is relatively high.

TL;DR: In this article, Algerian kaolinite and high purity alumina were used to synthesize Algerian mullite, which reached a relative density of 94% of the theoretical density at a relatively low sintering temperature of 1600°C.

TL;DR: In this paper, the adsorption of 2,4-dichlorophenoxyacetate (2,4D) on Mg/Al-NO3 LDHs with varying layer charge density was investigated with particular attention on the effect of the interlayer nitrate.