Showing papers in "Applied Clay Science in 2003"

TL;DR: In this article, the adsorption features of clays with the magnetic properties of iron oxides have been combined in a composite to produce a magnetic adsorbent for contaminants in water and can be subsequently removed from the medium by a simple magnetic process.

TL;DR: In this paper, the authors give general information about geological sources and their characteristics, the literary evidence of use of different forms of earthy pigments on historical paintings, about analytical methods suitable in their identification within the ground and colour layers of the painting, and handling with the samples of works of art.

TL;DR: In this paper, the adsorption behavior of kaolinite, Pb, Zn and Cd were studied at three different concentrations (1, 2 and 3 mmol/l) and over different periods of exposure (0.1, 1, 2, 4, 8, 12 and 24 h).

TL;DR: In this paper, the effect of initial dye concentrations, adsorbent particle size and concentration, and agitation speed on adsorption was investigated, and two simplified kinetics models, pseudo-first order and pseudo-second order, were tested to investigate the adaption mechanisms.

TL;DR: Clay Minerals and the Environment (CME) as mentioned in this paper is a journal dedicated to the study of mining and the environment of Clay Minerals, and its relationship with the environment.

TL;DR: The use of organo-clays in wastewater treatment has become commonplace in industry today as mentioned in this paper and they exhibit a synergistic effect with many commonly utilized water treatment unit processes including granular-activated charcoal, reverse osmosis, and air strippers.

TL;DR: In this paper, the major impurities in the clay are quartz and siderite, which can be removed at room temperature by using 0.4 M oxalic acid solution, and the iron content of the clay may be reduced further by treating with wet high intensity magnetic separator (WHIMS) or leaching with organic acids.

TL;DR: Al-Fe or Al-Cu modified clays were prepared from two natural montmorillonites and employed in the phenol oxidation with hydrogen peroxide in water in this paper.

TL;DR: In this article, textural properties of homoionic Na- and Ca-bentonite (MX-80 from Wyoming) were studied by nitrogen adsorption, and the results showed that the presence of non-clay minerals in the bulk samples affects significantly textural property of the system.

TL;DR: The influence of acid concentration and leaching time on the porous properties of silica was studied in this article, where high surface area was obtained by selectively leaching vermiculite.

TL;DR: In this article, three HEU-type zeolites from Armenia, Georgia and Greece formed from alteration of volcanic glass were treated with dilute KOH and subsequently either reacted with 6N HCl or heated at 700 °C.

TL;DR: In this article, the effects of the cation saturation (Mg+, Ca+, Li, Na+, and K+) on the swelling-shrinkage behavior of the MX80 bentonite was investigated.

TL;DR: In this article, the swelling shrinkage of industrial Bentonite (MX80) was investigated using a new technique of environmental scanning electron microscopy (ESEM) coupled with a digital image analysis (DIA) program.

TL;DR: In this paper, the role played by the soil structure in the evolution of chemo-mechanical-coupled processes in bentonite was investigated by subjecting samples with different structures to similar salinisation-desalinisation cycles.

TL;DR: In this paper, the porosity distribution of a single ionic species in a low permeability clay medium was investigated at the millimeter-scale using multiscale data, and the results showed that porosity distributions are mainly controlled by surface interactions and pore-constriction electrochemical controls.

TL;DR: In this article, a data set obtained from the physicochemical and rheological investigation of 16 different commercial bentonites was used to determine the mineralogical composition of those powders including X-ray diffraction, DTA and chemical analysis.

TL;DR: In this article, scanning electron microscope (SEM) observations for micropore structure in compacted bentonite and through-diffusion experiments for non-sorptive tritiated water (HTO) were conducted.

TL;DR: In this article, the engineering behavior of bentonite-enhanced sand (BES) mixtures in relation to their performance as environmental barriers is considered, and data on the swelling and hydraulic conductivity are presented.

TL;DR: An alternative method for the preparation of mixed Fe-Al-pillared clays derived from two natural smectites, Wyoming SWy-1 and Tunisia-Gafsa VI (an iron-rich sample) based on the use of a mixture of FeCl3 and chlorhydrol is described in this article.

TL;DR: In this article, the application of the four current XRD methods for mineral quantification purposes is experimentally reviewed for clayey soils and the problems involved in clay mineral evaluation based on the direct use of peak intensity or areas under the peak are addressed.

TL;DR: In this paper, the maximum swelling strain is predicted according to the correlation of the water volume to vertical overburden pressure, and the good relationship between swelling strain and elapsed time is also proposed.

TL;DR: In this article, high and low-charge vermiculites from Spain (Santa Olalla and Ojen) were subjected to treatment in ultrasonic liquid processor in an attempt to reveal changes in particle size, morphology, and structure ordering.

TL;DR: In this paper, the influence of gamma-irradiation on physicochemical parameters (crystallinity, specific surface, cation exchange capacity, main layer charge) of various clay minerals (montmorillonite, illite and samples of the serpentine-kaolin group) were investigated.

TL;DR: In this article, the anions Cl- and I- in MX-80 compacted bentonite have been studied at different ionic strengths (0.01, 0.1 M NaClO4) and clay density ( 0.8, 1.2, 1.8 g cm(-3)) at the buffered pH.

TL;DR: The microstructure of dense smectitic-rich buffer clay confined in deposition holes and embedding hot rad-waste containers is not homogeneous and the rate of hydration depends on the transient structure and the water pressure.

TL;DR: In this article, a new interpretation of the role of structural charges on the affinity of edge groups for protons is given. But the effect of structural charge on the protonation-deprotonation behavior of a phyllosilicate clay surface is not discussed.

TL;DR: The intercalation of a cationic azobenzene derivative into the interlayer space of montmorillonite has been achieved by ion exchange between sodium-montmorillonites and p-(ω-dimethyl-hydroxyethylammonioethoxy)-azobenzenes bromide.

TL;DR: In this paper, the behavior of Cs and the adsorption sites for Cs atoms in clays were investigated in extended X-ray absorption fine structure (EXAFS) spectroscopy using a crystalline Cs2SO4 as a model compound.

TL;DR: In this article, the authors investigated the impact of low pH cement solutions and Friedland tonnite on the hydraulic conductivity of the mixed layer muscovite-montmorillonite clay minerals.

TL;DR: In this paper, a study was made with hydration under heated conditions for testing the hypothesis that thermally induced stresses will cause disintegration of grains and speed up the homogenization, leading to normal swelling pressure and hydraulic conductivity.