ion exchange bentonite

ion exchange bentonite

Natural bentonites—influence of the ion exchange and ...

2001-9-1 · The exchange occurs until an adsorption balance between the ion distribution at the bentonite and the ionic concentration in the soil solution is achieved. When the ion distribution of the bentonite has adapted to the geochemical environment according to the natural exchange balances, it will practically remain unchanged.

Utilization of Tunisian Bentonite as Ion-Exchange and ...

2013-11-26 · Keywords: Bentonite, ion-exchange, Langmuir isotherm, pseudo-second- order model, mass transfer analysis, Thermodynamic, (IR) spectra, (XRD) spectra. 1. Introduction 1Heavy metal pollution is an environmental problem of worldwide concern with effluents from various industrial

Research of the Chemical Composition and Ion Exchange ...

2017-2-7 · Dependency of ion exchange capacity by pH . Table 5 shows the results of the ion exchange capacity of bentonite at different depths from the deposit of Karaçeva. Table 6 shows the results of the ion exchange capacity (mmol/100g) for untreated bentonite and for treated bentonite in acidic way, with different percentages of sulphuric acid. Table 5.

Selectivity coefficient for Ca/Na ion exchange in highly ...

2011-1-1 · A selectivity coefficient for Ca 2+ /Na + exchange is needed to calculate the distribution of these cations in the bentonite buffer for various relevant groundwater compositions. Several investigators have reported selectivity coefficients from batch experiments, i.e. in high water to solid ratios e.g. Bruggenwert and Kamphorst, 1982, Sposito ...

Removal of rhodamine B using iron-pillared bentonite

The iron-pillared bentonite (Fe-Ben) was prepared by ion-exchange using the natural bentonite (GZ-Ben) from Gaozhou, China, at room temperature without calcination. Both Fe-Ben and GZ-Ben were characterized by X-ray diffraction, N(2) adsorption and Fourier transform infrared spectroscopy. The

Ion exchange and adsorption equilibrium studies on ...

2010-3-1 · Ion exchange equilibrium has been studied for many decades and numerous theories have been proposed. ... As expected the slit shaped pores of clays (bentonite and vermiculite) are also suggested by the H3 hysteresis type observed in the nitrogen adsorption isotherms shown in

Bentonite - an overview | ScienceDirect Topics

The adsorption phenomenon of bentonite is well explained by ion exchange/adsorption and precipitation [176]. Pb 2 + replaces the existed cations in the bentonite structure. At the alkaline region, OH − reacts with Pb 2 + and leads to precipitation of the final product. Other involved factors in the removal process, such as the amount of clay ...

Ion exchange isotherms in solid: electrolyte solution ...

2015-11-20 · It is shown show that the ion exchange isotherms and the law of mass action are equivalent, the c/a versus c functions can be derived from the law of mass action (c and a: the concentration of ions in ion exchanger and solution, respectively).The equations are applied for cation exchange processes of bentonite clay (cobalt, manganese, mercury ions with calcium-bentonite;

Modified Method for Bentonite Purification and ...

2016-6-1 · The powdered, acetone-dried bentonite was purified by a dispersion-sedimentation method in water after cation exchange of the interlayer Ca 2+ ion with Na + ion by the reaction of raw bentonite with aqueous NaCl. The purification was evaluated using X-ray

Cesium Uptake from Aqueous Solutions by Bentonite: A ...

2006-12-13 · Using the t test, the calculated data of multicomponent Langmuir and ion-exchange isotherms were fit to experimental data, and the best agreement was obtained for the ion-exchange model. The results show that Cs uptake by bentonite could be substantially decreased in systems with a high bentonite-to-water ( m / V ) ratio as a consequence of the ...

Utilization of Tunisian Bentonite as Ion-Exchange and ...

2013-11-26 · Keywords: Bentonite, ion-exchange, Langmuir isotherm, pseudo-second- order model, mass transfer analysis, Thermodynamic, (IR) spectra, (XRD) spectra. 1. Introduction 1Heavy metal pollution is an environmental problem of worldwide concern with effluents from various industrial

The role of ion-exchange bentonites in changing the ...

Natural bentonite containing Na and Ca was cationically exchanged with Ba, Sr, Cu and Cu–Ba. These different Ion exchange bentonites (IEBs) were used as fillers in styrene–butadiene rubber ...

Removal of Heavy Metal by Ion Exchange Using

The results indicated that bentonite was utilized as an efficient ion exchange element for the removal of heavy metal ions from polluted water. Fourier Transformed Infrared Spectrophotometer (FTIR) images of bentonite clay before and after adsorption showed the imbibition of metal ions by bentonite clay.

PRESSURE- INDUCED CAT ION EXCHANGE IN

CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): A B S TRACT: Exchangeable cation associations i physical mixtures of bentonite and laponite have been examined using X-ray diffraction and a combination f electron microprobe analysis and multivariate statistical methods. The results uggest that cation exchange can occur in air-dry mixtures when pressure (-64

Use of silver–bentonite in sorption of chloride and iodide ...

2020-10-30 · Ag–bentonite was prepared by ion exchange process to sorb iodide and chloride ions in batch experiments. The modified bentonite was examined with XRF and XRD. 75% of the cation exchange capacity was exchanged by silver ions. It was found that the sorption of chloride ions is an exothermic precipitation process because the solubility decreases with increasing temperature. In the

In vitro adsorption-desorption of phenethylamines and ...

An ion-exchange mechanism prevails for lewatite and for bentonite up to 0.8 mEq X g-1. The organic cations are more strongly adsorbed on bentonite than on lewatite. On bentonite, the selectivity of adsorption follows the order: primary less than secondary less than tertiary phenethylamines. An interlamellar monolayer is formed.

Characterization and purification of Algerian natural ...

2021-9-1 · Methodology: Natural bentonite was puried by Na+ ion exchange treatment combined with sedimentation techniques. Before use in the pharmaceutical industry, bentonite samples must be safe and conform to recommenda-tions and directives of pharmacopeia. A set of technological tests were investigated with the samples, such as cation

Chemical composition of raw and modified bentonite clay ...

Al3+-bentonite clay (Alum-bent) was prepared by ion exchange of base cations on the matrices of bentonite clay. Intercalation of bentonite clay with Al3+ was performed in batch experiments.

Changes in Swelling Pressure and Permeability of

2018-10-11 · Exposure of the Ca type-bentonite to NaCl or KCl solutions after fully saturation with deionized water caused ion exchange of the montmorillonite. After Ca ion exchanged to Na ion, the swelling pressure of the sample increased and the permeability decreased when the low ionic strength condition, comparing with the initial value before Na ion ...

Preparation and Mechanism of a New Enhanced Flocculant ...

2015-3-22 · Bentonite is characterized by the large specific surface, good adsorption, ion exchange ability, and nontoxicity. An enhanced bentonite base composite flocculant (BTA) can be prepared from treating the calcium base bentonite and compositing various functional additives. Bentonite was firstly treated by citric acid, then the talc and activated carbon turned to be acid part and simultaneously ...

Utilization of Tunisian Bentonite as Ion-Exchange and ...

2013-11-26 · Keywords: Bentonite, ion-exchange, Langmuir isotherm, pseudo-second- order model, mass transfer analysis, Thermodynamic, (IR) spectra, (XRD) spectra. 1. Introduction 1Heavy metal pollution is an environmental problem of worldwide concern with effluents from various industrial

Removal of Heavy Metal by Ion Exchange Using

The results indicated that bentonite was utilized as an efficient ion exchange element for the removal of heavy metal ions from polluted water. Fourier Transformed Infrared Spectrophotometer (FTIR) images of bentonite clay before and after adsorption showed the imbibition of metal ions by bentonite clay.

The role of ion-exchange bentonites in changing the ...

Natural bentonite containing Na and Ca was cationically exchanged with Ba, Sr, Cu and Cu–Ba. These different Ion exchange bentonites (IEBs) were used as fillers in styrene–butadiene rubber ...

PRESSURE- INDUCED CAT ION EXCHANGE IN

CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): A B S TRACT: Exchangeable cation associations i physical mixtures of bentonite and laponite have been examined using X-ray diffraction and a combination f electron microprobe analysis and multivariate statistical methods. The results uggest that cation exchange can occur in air-dry mixtures when pressure (-64

Further understanding of bentonite’s impact on metals in

2018-12-2 · metal ion changes when bentonite was added to protein-stable wine compared to protein-unstable wine. This significantly affected the exchange of major ions in the wine. For example, calcium concentration increased when bentonite was added to stable wine

In vitro adsorption-desorption of phenethylamines and ...

An ion-exchange mechanism prevails for lewatite and for bentonite up to 0.8 mEq X g-1. The organic cations are more strongly adsorbed on bentonite than on lewatite. On bentonite, the selectivity of adsorption follows the order: primary less than secondary less than tertiary phenethylamines. An interlamellar monolayer is formed.

The study of diffusion characteristics of soil bentonite ...

2021-3-26 · The main reason for this phenomenon is the presence of high ion exchange minerals in bentonite. By exposure to these environments, it is also laid open to degradation of the montmorillonite microstructure leads to change in hydraulic behavior. Three different compounds were used for laboratory-scale SBL, and diffusion was considered as the ...

Characterization and purification of Algerian natural ...

2021-9-1 · Methodology: Natural bentonite was puried by Na+ ion exchange treatment combined with sedimentation techniques. Before use in the pharmaceutical industry, bentonite samples must be safe and conform to recommenda-tions and directives of pharmacopeia. A set of technological tests were investigated with the samples, such as cation

Antibacterial Activity of Copper-doped Montmorillonite ...

2018-11-13 · 2.2 Alkaline Ion Exchange with Copper Bentonite were submitted to an ion exchange process by immersion to melts of CuSO4.5H2O at 550°C–560°C for 10, 20, 40, 60 and 90 min. This operation was done using 5 g of bentonite and 5 g of CuSO4.5H2O. After the ion exchange, the bentonite was adequately washed with distilled water and sanitation. The

Bentonite - ISHTAR COMPANY LLC

2021-10-15 · Bentonite is a clay generated frequently from the alteration of volcanic ash, consisting predominantly of smectite minerals, usually montmorillonite. Bentonite deposits are normally exploited by quarrying. Extracted bentonite is distinctly solid, even with a moisture content of approximately 30%. The material is initially crushed and, if ...