Showing papers in "Applied Clay Science in 2012"

TL;DR: In this paper, a mixture of metakaolin and alkali solution at a fixed ratio at room temperature and then pre-crashed to a fixed-radius size was used to make a geopolymer for heavy metal adsorption.

TL;DR: In this paper, the role of organo-modified or inorgano-organoclay or the clay based nano-materials/composites, which is perhaps an emerging area of nano-technology applied into the environmental remediation strategies.

TL;DR: The adsorption efficiency of kaolinite for Rhodamine B (RhB) removal from aqueous solution is reported in this paper, where the optimized conditions for the removal of RhB were evaluated as: initial concentration of rhB (90mg/L), agitation time (80min), adsorbent dose (3 ǫ), pH (7), and temperature (303 k), with high correlation coefficients (R 2 ) confirmed the validity of the Langmuir isotherm, with monolayer adorption capacity ( q m ) equal to 4

TL;DR: In this paper, the most relevant uses and applications of zeolites in anaerobic digestion processes are reviewed, and the feasibility of using natural zeolite as support media for the immobilization of microorganisms in different high-rate reactor configurations (fixed bed, fluidized bed, etc.) is also reviewed.

TL;DR: In this article, a systematic investigation on the synthesis of hydrotalcites at different pH values was performed, and the results revealed that the synthesis pH plays a crucial role on the morphology, pore structure and chemical composition of the final products.

TL;DR: A modified inorganic bentonite (Zenith/Fe) based on natural bentonite with the code name Zenith-N, was prepared by embedding Fe ions in the interlayer space of bentonite as discussed by the authors.

TL;DR: In this article, the removal of tetracycline (TC) from aqueous environment by illite (IMt-2) was studied in a batch system at different pH and ionic strength conditions.

TL;DR: In this article, the authors investigated influential factors (water content, cement content, fly ash content, and curing time) on strength development in saline soil admixed with cement and fly ash.

TL;DR: In this article, a comparative study of a wide collection of sepiolites (22 samples from different locations) was made with the aim of understanding the real============variability of the surface properties in sepiolite.

TL;DR: In this article, a "Clay Bio Polymer Nanocomposite" (CBPN) was used in drug release by dispersion of montmorillonite (Mt) particles in chitosan (Ch) solution.

TL;DR: In this paper, the influence of different anions intercalated in the layered double hydroxides (LDHs) was investigated, and the main aim was to understand the layer-anion and the intermolecular interactions in hydrotalcite-like compounds with F−, Br−, OH−, CO32− and NO3−.

TL;DR: In this paper, the authors studied the time-dependent changes in the structure of lime stabilized montmorillonitic and lateritic clays using solid state nuclear magnetic resonance (SS-NMR) and Fourier transform infrared (FTIR) spectroscopy.

TL;DR: In this paper, the effect of temperature on the grafting of γ-aminopropyl triethoxysilane (APTES) on the interlayer hydroxyl groups of kaolinite pre-intercalated with DMSO was investigated using Fourier transform infrared spectroscopy, X-ray diffraction, thermal analysis and elemental analysis.

TL;DR: In this article, the authors compare fired and unfired clay technologies, and also combine energy use and CO 2 emission for the evaluation of unfired Clay bricks relative to those bricks used in mainstream construction.

TL;DR: Amine and carboxylate functionalised bentonites were used as adsorbents of heavy metal ions (Pb(II), Hg(II) and Cu(II)) from aqueous solutions as discussed by the authors.

TL;DR: In this article, a study of laboratory-treated Na+-smectite and Pierre Shale and natural thermo-mature gas shale indicate that, large quantities of silica are released during clay mineral transformation to form quartz cement (within a closed shale system).

TL;DR: In this paper, four types of layered double hydroxides (LDHs) synthesized by coprecipitation method including Mg-Al and Mg−Fe in 3:1 and 4:1 ratios of M 2+ /M 3+ were compared in terms of chemical structure, nitrate adsorption isotherm and kinetics, thermodynamic parameters, anion exchange capacity and nitrate selectivity in the presence of common anions found in soil solutions.

TL;DR: In this article, the basicity of MMgAlO mixed oxide catalysts was evaluated by thermal decomposition of the corresponding layered double hydroxide (LDH) precursors, and a straight correlation between the number of basic sites determined by CO2-TPD and their catalytic activity was evidenced.

TL;DR: In this article, the results of unconfined compression tests indicated an increase in strength with increasing cement content and the specific gravity of treated soil solids first increased and then decreased with cement content.

TL;DR: In this paper, a review of case studies of mechanochemically induced transformations of pollutants are presented, including the breakdown of pesticides (2,4-D, imazaquin and atrazine) and other organic pollutants such as DCP and PAHs achieved by light grinding for short durations (a few minutes) in a mixture with minerals which are soil components or derivatives of such components is described.

TL;DR: In this article, the impact of a wetting and drying path on the swelling/shrinkage of a compacted lime-treated expansive clayey soil both at the macro- and micro-scales was examined.

TL;DR: In this article, the correlations between six potentially toxic elements (Cd, Cr, Pb, Cu, Hg and As) and soil diffuse re-ectance spectroscopy were studied to assess their binding forms and predict their concentrations.

TL;DR: In this article, Li et al. used LiS slag as raw material to synthesize zeolite X by hydrothermal reaction with alkaline fusion and determined the maximum adsorption capacity of NaX-1 for water vapor is 0.3208 kg/kg.

TL;DR: In this article, a series of poly(oxypropylene)-amidoamine (POAA) compounds were synthesized by condensation of low molar mass poly-propylene diamine POP230 with diacids.

TL;DR: In this article, a co-precipitation method was used for the preparation of double hydroxide (LDH) at a constant pH of 7 and a ratio of Zn/Al = 4.

TL;DR: In this article, the adsorption of Th(IV) on calcined and flux calcined diatomite was found to be a spontaneous and endothermic process and the experimental data fitted very well the pseudo-second-order kinetic model and also followed by intra-particle diffusion model.

TL;DR: In this article, a micro-indentation test and a mini-compression test were performed on samples under different levels of relative humidity and the influence of structural anisotropy was considered.

TL;DR: In this paper, a clay pillared with Al-Fe was synthesized as a catalyst for (photo)-Fenton oxidation of 4-chlorophenol, which was characterized by X-ray diffraction, nitrogen physisorption, diffuse reflectance UV-VIS spectroscopy and temperature-programmed reduction.

TL;DR: Three release mechanisms accounted for the rate and extent of the drug release: ion exchange, desorption and weathering, and different solubility of the anionic and non-ionic ibuprofen species explained the release behavior for particulate solid and hydrogel formulations.

TL;DR: In this article, the antimicrobial efficiency of novel MtCu2+/LDPE nanocomposites against Escherichia coli 0157:H7 n/t was tested in the present work.