Sorption to montmorillonite and kaolinite was linear over the entire concentration range but sorption to illite was non-linear, indicating the presence of multiple sorption sites. Based on the 14day batch desorption data, cesium sorption appeared irreversible at high surface loadings in the case of illite but reversible at all …
Kaolinite, montmorillonite, and their modified derivatives as adsorbents for removal of Cu (II) from aqueous solution. K. Bhattacharyya, Susmita Gupta. Published …
For the separation of viruses adsorbed onto clay colloids from suspended viruses in the liquid phase, ... who have reported that the attachment of coliphages T7 and T1 is greater onto kaolinite than montmorillonite. Furthermore, it was observed that the attachment of MS2 onto both minerals was greater than that of ΦX174. ...
The NH 4 + adsorption capacity is however strongly mineral-dependent and follows the order of vermiculite ≈ montmorillonite ≫ illite > kaolinite ≈ chlorite. The much higher NH 4 + adsorption capacities of vermiculite and montmorillonite can be attributed to the NH 4 + adsorption in their interlayer sites in addition to the surface and ...
In case of montmorillonite, while ZrO suppresses the adsorption of montmorillonite almost to the level of kaolinite, it is much less for 393 K.G. Bhattacharyya, S.S. Gupta / Separation and Purification Technology 50 (2006) 388–397 Fig. 3.
The covering of aimed minerals by kaolinite and montmorillonite is an important factor leading to poor flotation selectivity. Organic inhibitors with small molecular weights can significantly ...
The diffusion coefficients of Al atoms in (a) kaolinite and (b) montmorillonite, the diffusion coefficients of O atoms in (c) kaolinite and (d) montmorillonite at isothermal heating stage. The diffusion coefficients of Na + ions at 1000 °C in kaolinite and at 1200 °C in montmorillonite are 4.80 × 10 −9 and 1.52 × 10 −8 m …
DOI: 10.1016/j.cis.2007.12.008 Corpus ID: 46326374; Adsorption of a few heavy metals on natural and modified kaolinite and montmorillonite: a review. @article{Bhattacharyya2008AdsorptionOA, title={Adsorption of a few heavy metals on natural and modified kaolinite and montmorillonite: a review.}, author={Krishna G. …
The pyrite flotation in the presence of clays (montmorillonite (Mt), kaolinite (Kaol) and illite (I)) was improved with the deprotonation reactions at pH 9.0 compared with the protonation at pH 4.5.
The maximum sorption capacity of Tl(I) on Na–Mt was 22.37, 29.27, and 37.82 mg/g, and the sorption capacity on kaolinite was 14.08, 13.33, and 12.66 mg/g at 288, 303, and 318 K, respectively. This difference is accordance with the …
Montmorillonite structure Kaolinite structure Figure 1: Schematic representation of clay structures showing T and O layers and preferential adsorption of water (adapted from Farrokhpays et al. [6]).
Abstract. Extensive deposits of kaolinite in Florida are formed by transformation of montmorillonite during low-temperature supergene weathering. The transformation occurs by intracrystalline leaching of interlayer cations and tetrahedral silica layers. Interposition of stripped layers within montmorillonite creates a regular 1:1 mixedlayered ...
Just as the case of kaolinite, there are more 1-site based fitting studies than multi-site works for montmorillonite. For the 1-site based studies, the pKa range for the deprotonation constants of S–OH site is 5.26–8.5. For the multi-site based works, the pKa range is very similar: 4.8–8.71 given that the two high values, 10.5 (Bradbury and …
It is 4 μm–14 μm for fresh water, 4–17 μm for salinity = 2, and slowly increases up to 22 μm when salinity = 20. This is the major difference, in range of floc size distribution, between montmorillonite and kaolinite. This is the reason (lack of large particles) of having a slow settling velocity for montmorillonite.
Kaolinite and montmorillonite have distinct structural differences and are widely used in adsorption studies [14], [15]. Kaolinite (1:1) is a clay composed of layers of one tetrahedral silica sheet (T) fused to one octahedral alumina sheet (O), whereas montmorillonite (2:1) is composed of layers of one octahedral (O) and two tetrahedral …
Montmorillonite and kaolinite were chosen as model clays in this study because of their common occurrence in temperate-zone soils. They also exhibit dramatically different physicochemical characteristics. Montmorillonite has a high exchange capacity dominated by a constant surface charge, and a high surface area due to its expansive …
Montmorillonite and its modified forms exhibited a significantly increased metal adsorption capacity relative to kaolinite and modified kaolinite. The modified clay mineral form was produced by pillaring montmorillonite or kaolinite by using polyoxy cations including Zn 4+, Al 3+, Si 4+, Ti 4+, Fe 3+, Cr 3+, or Ga 3+ .
This study investigated the feasibility of using montmorillonite and kaolinite to remediate uranium-contaminated groundwater. The results showed that the two minerals achieved U (VI) removal rates ...
The present work investigates the removal of Cu(II) ions from an aqueous solution by kaolinite, montmorillonite, and their poly(oxo zirconium) and tetrabutylammonium derivatives. The entry of ZrO and TBA into the layers of both …
Thus, a systematic review of published results on the wettability of six different clay minerals (kaolinite, montmorillonite, illite, mica, talc and pyrophyllite) is provided here, spanning from ...
This study investigated the comparative reinforcement effect of Achatina fulica snail shell nanoparticles, montmorillonite, and kaolinite nanoclay on greenpoxy. Greenpoxy nanocomposites of snail shell nanoparticles, montmorillonite, and kaolinite nanoclay were developed separately, with the nanofiller content ranging from 1 to 3% by …
The respiration of three phenotypes of Histoplasma capsulatum, the causal agent of histoplasmosis in humans, was markedly reduced by low concentrations of montmorillonite but was reduced less by even higher concentrations of kaolinite or attapulgite (palygorskite). The reduction in respiration follo …
The non-retarded Hamaker constants across water (air) are 5.1 (59.2) zJ and 7.3 (75.4) zJ for montmorillonite and kaolinite, respectively. The combined effect of retardation and geometrical peculiarities of the monmorillonite system are discussed briefly. It is shown that the van der Waals free energy between two montmorillonite layers of ...
Essington et al. (2010) examined the adsorption of Tyl by montmorillonite and kaolinite as a function of several solution variables, including pH, ionic strength, and the dominant electrolyte ...
In this paper, anhydrous pyrolysis experiments were performed on Huadian oil shale kerogen with and without different minerals (calcite, kaolinite, gypsum, montmorillonite) using a Fischer assay retorting system. The effect of mineral matrixes on the formation of oil was investigated, and their catalytic activities were obtained through …
Batch desorption experiments were conducted to determine Cs sorption reversibility on illite, montmorillonite, and kaolinite. In Fig. 2, the fraction of sorbed Cs that had desorbed from each mineral after two weeks is plotted against the logarithm of the equilibrium aqueous Cs concentration after desorption.
During the study, the chemical composition of the materials of montmorillonite and kaolinite in native and activated forms and the surface morphology were measured by the SEM-EDXA method using FESEM ZEISS SUPRA 40 equipment; the content of the adsorbate, methyl ethyl ketone (MEK), in the reactor air was determined …
separation procedure. The degree of separation which can be achieved by one pass through the instrument using an artifi.cial mixture of kaolinite (A.P.L Standard No. 9) and …
Adsorption of Co(II) on kaolinite and acid‐activated kaolinite is endothermic driven by entropy increase but the same process follows exothermically on montmorillonite and acid‐activated montmorillonite supported by entropy decrease. In both cases, spontaneous adsorptive accumulation is ensured by favorable Gibbs energy decrease.
Montmorillonite and its modified forms exhibited a significantly increased metal adsorption capacity relative to kaolinite and modified kaolinite. The modified clay …
The results have shown that kaolinite, montmorillonite and their poly(oxo zirconium) and tetrabutyl-ammonium derivatives could be used as adsorbents for …
The pick-up, migration, deposition, and clogging behaviors of fine particles are ubiquitous in many engineering applications, including contaminant remediation. Deposition and clogging are detrimental to the efficiency of environmental remediation, and their mechanisms are yet to be elucidated. Two-dimensional microfluidic models were …
Its presence in both raw and purified samples indicated that the applied granulometric treatments (even the method 3) were inappropriate for the separation of kaolinite from montmorillonite. Spectra of the raw bentonites presented two bands at 780 and 802 cm − 1 (Fig. 7 (a) and (c)), which were characteristic of quartz (Bosch-Reig et …
It was found that kaolinite and montmorillonite caused different issues in coal flotation process. In deionized water, the results show that a lower flotation recovery and worse selectivity were ...
This study investigated the feasibility of using montmorillonite and kaolinite to remediate uranium-contaminated groundwater. The results showed that the two minerals achieved U(VI) removal rates of 78.68% and 69.89%, respectively. The maximum saturation adsorption amounts were 3.78 × 10–5 mol g−1 and 3.85 × 10–5 mol g−1, …
The covering of aimed minerals by kaolinite and montmorillonite is an important factor leading to poor flotation selectivity. Organic inhibitors with small molecular weights can significantly improve this phenomenon. ... Flotation is a practical technology to realize the separation of aimed minerals and gangue in fine-grained minerals based on ...
Fig. 2 shows the zeta potentials of kaolinite and montmorillonite in the presence and absence of PFOS. The point of zero charge (PZC) of kaolinite was 3.2, whereas that of montmorillonite was less than 2.0. The results indicate that in the pH range 5.0–7.0, the clay minerals were negatively charged and kaolinite resulted in an …
1. Introduction. Froth flotation is an effective separation method for fine coal cleaning. In this method, separation is achieved because of the differences in surface hydrophobicity between organic and mineral matter [1], [2], [3].It is well accepted that fine minerals, mainly clays (kaolinite, illite, and montmorillonite), have a detrimental effect …
Montmorillonite and kaolinite have different structures. Montmorillonite is a 2:1 type of clay mineral, and its unit layer structure consists of one Al 3+ octahedral sheet, which is placed between two Si 4 ... After reaction and subsequent centrifugation separation, Tl(I) released to the solution was analyzed by using AAS. After desorption, …
The results indicated that the adsorption processes of montmorillonite and goethite approached equilibrium within 20 min, while 60 min were required for the adsorption processes of kaolinite and ferrihydrite. The adsorption processes of Pb 2+ by the four minerals best fit the pseudo-second order model.
