Modelling of ion-exchange reactions in diverse clays and bentonites has been reported – for example, onto MX80 bentonites (e.g. Chaparro et al., 2021), ... With …
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The adsorption phenomenon of bentonite and kaolin can be well explained by ion exchange mechanism [25, 39]. However, the maximum removal of Pb(II) cations at pH …
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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 ...
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Various types of chemicals which cater to filtration, process, cooling tower and boiler water treatment applications, Membranes and Ion Exchange Resins. We also offer technical services erection & commissioning, operation & maintenance of plant and supply of spares & consumables.
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Evaluation of ion exchange capacity of acid activated, thermally treated Iranian Na-Bentonite as a cheap alternative for ammonium removal in aquaculture farms of Iran and comparison with H-zeolite synthesis Abbasi Hadi1, Arne Verliefde 1, Naser Agh2 and Behrooz Atashbar2 1 Particle and Interfacial Technology group (PaInT) Laboratory, …
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Bentonite (Bent) is an excellent ion-exchange material, with high natural abundance, super stability, but it has low conductivity. In this paper, a nitrogen-doped carbon modified Bent (NC@Bent) was prepared by in-situ polymerization of dopamine on the surface of Bent followed by carbonization. The N,C-modified thin layer on Bent improved the ...
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The ion exchange rate of lead was faster than that of copper. The isotherm for the adsorption of the lead and copper ions on bentonite clay was confirmed by the Freundlich and Langmuir isotherms ...
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Utilization of Tunisian Bentonite as Ion-Exchange And Sorbent Material In The Removal Of Lead From Aqueous Solutions. The holistic approach to environment, 3(3), 123–140. 10. Inglezakisa V.J., Stylianou M.A., Gkantzoua D., Loizidoua M.D. 2019. Removal of Pb (II) from aqueous solutions by using clinoptilolite and bentonite as adsorbents.
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Na/K, Na/Mg, and Na/Ca exchange isotherms have been experimentally determined for the FEBEX bentonite. Na-homoionized FEBEXbentonite was reacted at room temperature with mixedsalt dissolution of NaCl/KCl, NaCl/MgCl2, or NaCl/CaCl2, while keeping a total cation normality of 0.5 eq L-1. Isotherm exchange experiments …
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The leach rate of 60 Co and 137 Cs from two different ion exchange resins: (a) spent cation exchange resins and (b) spent mix bead ion exchange resins in cement–bentonite matrix has been studied. The solidification matrix was a standard Portland cement mixed with 290–350 kg/m 3 spent cation exchange resins, with or …
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Ion exchange. In the ion exchange interaction, mobile ions of adsorbent act as the ion exchanger and are exchanged with other ions of a similar charge in wastewater solution. …
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Prediction of swelling characteristics of compacted GMZ bentonite in salt solution incorporating ion-exchange reactions - Volume 67 Issue 2. ... these effects are caused by the inhibitory action of salinity and the ion-exchange reaction between the solution and bentonite.
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Salt solutions have complex effects on the swelling characteristics of compacted bentonite; these effects are caused by the inhibitory action of salinity and the ion-exchange reaction between the solution and bentonite. In order to characterize the swelling properties of compacted bentonite in a salt solution, swelling deformation tests …
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In this geo-chemical environment an ion exchange of sodium-bentonite to calcium-bentonite occurs due to two reasons. Firstly calcium is often predominating, secondly bivalent Ca 2+ is more easily exchanged against monovalent sodium (Na +) than vice versa. This exchange typically takes place over a period of several month to few years, …
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Monmorillonite was the main component of bentonite sample (>80%). Ion exchange equilibria of Zn 2+, Cr 3+, and Mn 2+ on bentonite was examined by use of batch equilibrium isotherms, distribution coefficients, and maximum exchange levels (MELs) under the same normality for all metals (0.01 N) at 25 ± 2°C. The equilibrium …
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However, calcium Bentonite can be changed to sodium Bentonite by the ion exchange process. The swelling type or sodium Bentonite, which has single water layer particles containing Na+ as the exchangeable ion. ...
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Although K and Na ions were monovalent, the changes in the engineering properties of the compacted bentonite-sand mixture caused by the ion exchange were different. After ion exchange from Ca ion to Na ion, the increase in the swelling pressure and reduction of the permeability were observed when the deionized water permeated. …
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In that geochemical environment an ion exchange of sodium-bentonite to calcium-bentonite occurs over a period of approximately 1–3 years, if in contact with cover-soil seepage. As a result, there is a slight increase in hydraulic conductivity of approximately half to one order of magnitude. This is, however, not alarming, as long as the ...
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Who We Are. Ion Exchange & Company LLC is a joint venture between Hofincons & Co.llc, Oman and Ion Exchange Ltd, Mumbai India, established in the Sultanate of Oman as a limited liability company …
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The thermodynamic activities of ion pairs were measured electrometrically in a series of aqueous mixtures of monoionic bentonite and the corresponding chlorides. Ion exchange membranes and Ag-AgCl electrodes were used. The lyotropic order for the various cation species varied somewhat for two different preparations.
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Absorbent Absorbate Adsorption potential function Adsorption na E (kJ/mol) Reference isotherma Clinoptilolite NH4+, Zn2 +, Cd2 +, Co2 +, Normalized DA 5.847 2.09 (2.1–10.4) 16.7 7 3.21 (9.47–21.74) [23] Cu2 +, Sr2 +, Ni2 +, Pb2 +, Cs + Clinoptilolite Pb2 + Normalized DA 5.2 17.49–18.90 [23] Clinoptilolite Pb2 + Normalized DA 4.2 ...
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Journal of Ecological Engineering Vol. 22(1), 2021 106 was 0.001 for Y 2 O 3. The physical analysis of bentonite clay found that cation exchange capac -
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bentonite to be 10–30 µm, and with particle aggregation. Hereinafter, montmorillonite in the bentonite powder was simply noted as "montmorillonite." Hydrothermal ion exchange of bentonite was performed, using ion exchange water under various temperatures, times, and treatment cycles. It was found that Ca2+ in the raw mont-
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Prediction of swelling characteristics of compacted GMZ bentonite in salt solution incorporating ion-exchange reactions - Volume 67 Issue 2. ... these effects are caused by the inhibitory action of salinity and the ion-exchange …
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The CECs and exchange cations of Ca 2+ /Mg 2+ bentonite Calcigel ® in various NaCl mixtures were studied to simulate the samples that are provided from various geotechnical applications in saline environments. Calcigel ® is bentonite with moderate amounts of calcite and dolomite.
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In that geochemical environment an ion exchange of sodium-bentonite to calcium-bentonite occurs over a period of approximately 1–3 years, if in contact with …
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Email: [email protected]. Let our experts help you solve your water and environment management challenges. Get In Touch. Ion Exchange is the best Oman …
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