scholarly journals Heavy-metal uptake by a high cation-exchange-capacity montmorillonite: the role of permanent charge sites

2013 ◽  
Vol 12 (3) ◽  
pp. 248-255
Keyword(s):  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Metal Uptake ◽  
Exchange Capacity ◽  
Point Of Zero Charge ◽  
Heavy Metal Uptake ◽  
Smectite Clays ◽  
Analysis Scheme ◽  
High Cation Exchange Capacity

A High Cation Exchange Capacity (HCM) montmorillonite clay has been prepared by acetate treatment of Zenith clay. The HCM has been evaluated for metal-uptake from aqueous solutions. The present data show that the cation exchange sites can play a significant role in the adsorption of metals in smectite clays. A theoretical analysis scheme has been developed which shows that permanent-charge sites can become dominant in metal-uptake by clays. In addition, it was shown that the permanent charge can influence the ionic-strength sensitivity of the Point of Zero Charge of the clay.

Ionic composition of a disordered kaolinite

Clay Minerals ◽  
1966 ◽  
Vol 6 (4) ◽  
pp. 341-344 ◽  
Author(s):  
W. E. Worrall ◽  
A. E. Cooper
Keyword(s):  
Cation Exchange ◽  
Clay Mineral ◽  
Cation Exchange Capacity ◽  
Ionic Composition ◽  
Exchange Capacity ◽  
Plastic Clay ◽  
High Cation Exchange Capacity

AbstractA white-burning, highly-plastic clay from Jamaica, containing mainly disordered kaolinite, was examined recently. It was unusual in that it was practically free from fine mica, and therefore could be purified readily by standard sedimentation techniques.The cation exchange capacity was abnormally high, and the purified clay mineral, on analysis and calculation of the ionic composition, was found to be deficient in aluminium, but contained magnesium and iron.The results confirmed the view, previously expressed, that disorder in kaolinites is associated with a high cation exchange capacity and a substituted lattice.

scholarly journals Biochar Surface Oxygenation by Ozonization for Super High Cation Exchange Capacity

2019 ◽  
Vol 7 (19) ◽  
pp. 16410-16418 ◽  
Author(s):  
Gyanendra Kharel ◽  
Oumar Sacko ◽  
Xu Feng ◽  
John R. Morris ◽  
Claire L. Phillips ◽  
...  
Keyword(s):  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
High Cation Exchange Capacity

scholarly journals Cd2+Exchange for Na+and K+in the Interlayer of Montmorillonite: Experiment and Molecular Simulation

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Lefu Mei ◽  
Huashang Tao ◽  
Chao He ◽  
Xuebing Xin ◽  
Libing Liao ◽  
...  
Keyword(s):  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Interlayer Space ◽  
Molecular Simulations ◽  
Exchange Interactions ◽  
Exchange Capacity ◽  
Molecular Dynamic Simulations ◽  
Dynamic Simulations ◽  
Cation Exchange Reaction ◽  
High Cation Exchange Capacity

Montmorillonite (Mt) has high cation exchange capacity and thus has been studied extensively for its cation exchange interactions with other cations. However, molecular simulations for the forces governing the cation exchange on Mt surfaces or in the interlayer spaces were limited. In this study, Mt with K+and Na+in the interlayer spaces was tested for its cation exchange with Cd2+in solution and the forces driving the cation exchange reaction were simulated by molecular simulations. The experimental results showed that Na+in Na + Mt was completely exchanged by Cd2+, while only 50% of K+in K + Mt was exchanged by Cd2+. A largerd-value was noticed for Na + Mt in comparison to K + Mt, suggesting that the interlayer space is more hydrated with Na+as the interlayer space cation. Molecular dynamic simulations revealed a larger energy decrease when Cd2+substitutes K+. However, the nice fit of the K+into the 12-coordinated interlayer space sites may restrict its hydration and thus reduce its interlayer space cation exchange capability by Cd2+.

Lanthanide-Clay Nanocomposites: Europium(III) Complexes Intercalated in Bentonite

2007 ◽  
Vol 121-123 ◽  
pp. 1245-1248 ◽  
Author(s):  
Eglantina Benavente ◽  
Yuri Echeverría ◽  
Vladimir Lavayen ◽  
Clivia M. Sotomayor Torres ◽  
G. Gonzáles
Keyword(s):  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Optical Materials ◽  
Molecular Size ◽  
Exchange Capacity ◽  
Clay Nanocomposites ◽  
Emission Properties ◽  
The Matrix ◽  
Host Cation

The intercalation of [Eu(2,2 bipyridine)2 ]3+ and [Eu(1,10 phenantroline)2]3+ into bentonite results in new nanocomposites which preserve the emission properties of the lanthanide. The exchange of sodium by lanthanide in the bentonite correlates with the host cation exchange capacity as well as with the guest molecular size and the interlaminar volume available in the clay. The intercalated complexes exhibit luminescence indicating an efficient protecting role of the matrix. This in turn points to lanthanide-clay nanocomposite as novel optical materials.

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