Showing papers in "Applied Clay Science in 2009"

TL;DR: In this paper, an overview of the use of metakaolin as partial replacement of cement in mortar and concrete is presented, and properties reported in this paper are the fresh mortar/concrete properties, mechanical and durability properties.

TL;DR: In this paper, the effect of nonevaporable water on the strength variation of geopolymers was firstly analyzed and it was shown that it is necessary to keep the strength stable and the optimum content was about 7.4%.

TL;DR: In this article, the effect of initial dye concentration, contact time, adsorbent dose, stirring speed, pH, salt concentration and temperature were studied in batch mode using commercially available kaolin to adsorb two different toxic cationic dyes namely crystal violet and brilliant green from aqueous medium.

TL;DR: Minerals are widely used in the pharmaceutical industry as lubricants, desiccants, disintegrants, diluents, binders, pigments and opacifiers, as well as emulsifying, thickening, isotonic agents and anticaking agents, and flavour correctors and carriers of active ingredients as discussed by the authors.

TL;DR: In this article, the synthesis and characterization of nano-scale zero-valent iron in the presence of kaolinite clay (nZVI-kaol) was reported, and the adsorbent was produced at initial Fe:kaolinite mass ratios of 1:1, 0.5:1 and 0.2:1.

TL;DR: In this paper, the activation energy of the adsorption process was calculated based on the pseudo-second order rate constant, and it was shown that H2PO4− had the greatest affinity for the adsorbent surface.

TL;DR: In this article, the potential use of kaolin as alternative adsorbents for removal of congo red from wastewater was investigated, and the effect of adsorbent dosage, dye concentration, pH and temperature were experimentally studied to evaluate the adsorption capacity, kinetics and equilibrium.

TL;DR: In this article, the mineralogical transformations during firing of two extremely calcareous clays, one calcite and other dolomite rich, and relatively poor in silica were studied.

TL;DR: In this article, a chitosan intercalated montmorillonite (Chi-MMT) was prepared by dispersing Na + -MMT into chitoshan solution at 60°C for 24h.

TL;DR: In this paper, the synthesis of zeolite Linde Type A (LTA) from kaolinite by two different routes: (1) conventional hydrothermal alkaline activation and (2) alkaline fusion prior to hydro-thermal reaction, as well as its nucleation and growth history, were investigated.

TL;DR: In this article, three kaolins were heated between 500 and 850°C. The results showed no direct relationship between pozzolanic activity of metakaolin and the degree of dehydroxylation.

TL;DR: In this paper, the suitability of illite/smectite clay to form a geopolymer after thermal and alkaline activation was investigated and the performance of the binder in terms of strength as well as the phase composition was studied.

TL;DR: In this paper, metakaolin-based geopolymer coatings on both stainless and mild steel substrates have been prepared, and the adhesive strength was found to be > 3.5 MPa.

TL;DR: In this article, the acid buffering behaviour of red muds was investigated by incubation of acid-treated red mud with various amounts of hydrochloric acid and showed that sodalite and calcite buffer (i.e. dissolve) simultaneously.

TL;DR: In this article, the performance of the gypsum as an additive for treatment of the expansive clay soils by means of swell potential and strength was examined, and the results indicated that gypsuma can be used as a stabilizing agent for expansive clay soil, effectively.

TL;DR: In this paper, the bulk material of six dioctahedral and two trio-clique swellable clay minerals was leached in H2SO4 and HCl at concentrations of 1.0, 5.0 and 10.0 M at 80 °C for several hours.

TL;DR: In this article, the removal of Pb(II) from aqueous solution by adsorption onto Na-bentonite was investigated under ambient conditions as a function of shaking time, pH, ionic strength, and temperature using batch technique.

TL;DR: In this article, the intercalation of tetracycline (TC) into swelling clay minerals was studied and the interlayer expansion was seen at a higher pH when the TC molecules adopted an extended conformation, even though, the amount of TC intercalated at higher pH is lower.

TL;DR: The adsorption isotherms were fitted by the Langmuir model and the diffusion controlled mechanism of VB1 in vitro release experiments as discussed by the authors, where 34 and 64% of the intercalated Vb1 was released within 10h, in simulated gastric fluid (pH 1.2) and simulated intestinal fluid(pH 7.4) respectively at 37± 0.5°C.

TL;DR: In this paper, a more complex model involving a constrained polymer region was proposed to accommodate the deviations from the Tortuous Path Model, which fits much of the data in the literature but includes variables that have not been measured.

TL;DR: In this paper, Nitrate forms of layered double hydroxides (LDHs) were synthesized based on the co-precipitation method under different synthesis conditions (aqueous ammonia solution or potassium hydroxide to control the pH of the solution; magnesium to aluminium ratios of 2:1 and 5:1).

TL;DR: In this paper, the effects of layer charge density and interlayer nitrate orientation of Mg/Al-NO 3 LDHs on the preferential adsorption of arsenate were investigated.

TL;DR: In this article, the vermiculites were divided into two types: type 1 (Sta. Olalla, Piaui and Goias) and type 2 (Piaui, Goias and Olalla).

TL;DR: In this article, the performance of two types of adobes, traditional adobe and Pressed Adobe Blocks (PABs), were compared with an unconfined compression test with three loaded and unloaded cycles at 30% of the compressive strength.

TL;DR: In this paper, the adsorption of a zeolite, clay and diatomite from Serbia toward aqueous Cu 2+ ions was studied, at different pH.

TL;DR: In this article, a hydrotalcite-like compound [Zn2Al(OH)6]NO3·nH2O (ZnAl-NO3) was intercalated with the chelating agents diethylenetriaminepentaacetic acid (dtpa) and meso-2,3-dimercaptosuccinic acid (dmsa) by anion exchange to uptake Cu2+, Cd2+ and Pb2+ from aqueous solutions.

TL;DR: In this paper, the adsorption of Pb(II) from aqueous solution on palygorskite was studied as a function of pH, ionic strength and temperature.

TL;DR: In order to modify the release of thiram, a dithiocarbamate fungicide, from starch-alginate beads and to minimize the agro-environmental pollution, kaolin and bentonite have been used as adsorbent in the bead formulations as mentioned in this paper.

TL;DR: In this paper, the urea method is used for synthesis of highly crystalline layered double hydroxides (LDHs), and the Mg/Al ratios in products have been often found to be smaller than those of starting solutions.

TL;DR: In this article, the authors used the skeleton void ratio of montmorillonite to predict the vertical pressure over which the measured plots start to deviate from linearity between the minimum void ratio and vertical pressure.