Dynamic equilibrium of ion exchange in the system lead-cation exchanger at different temperatures

1988 ◽  
Vol 331 (8) ◽  
pp. 811-813
Author(s):  
Š. Cerjan -Stefanović ◽  
M. Kaštelan -Macan
Keyword(s):  
Ion Exchange ◽  
Cation Exchanger ◽  
Dynamic Equilibrium ◽  
Different Temperatures ◽  
Lead Cation

scholarly journals Fabrication of a lead ion selective membrane based on a polycarbazole Sn(iv) arsenotungstate nanocomposite and its ion exchange membrane (IEM) kinetic studies

RSC Advances ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 4210-4220
Author(s):  
Mohd. Zeeshan ◽  
Rais Ahmad ◽  
Asif Ali Khan ◽  
Aftab Aslam Parwaz Khan ◽  
Guillermo C. Bazan ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Polyvinyl Chloride ◽  
Cation Exchanger ◽  
Kinetic Studies ◽  
Ion Exchange Membrane ◽  
Lead Ion ◽  
Solution Technique ◽  
Casting Solution ◽  
Selective Membrane ◽  
Exchange Membrane

A polycarbazole-Sn(iv) arsenotungstate (Pcz-SnAT) nanocomposite cation exchanger membrane (CEM) was prepared via the casting solution technique utilizing polycarbazole-Sn(iv) arsenotungstate and PVC (polyvinyl chloride) as a binder.

Ion-exchange breakthrough curves for single and multi-metal systems using marine macroalgae Pelvetia canaliculata as a natural cation exchanger

2015 ◽  
Vol 269 ◽  
pp. 359-370 ◽  
Author(s):  
Fabíola V. Hackbarth ◽  
Franciélle Girardi ◽  
João C. Santos ◽  
Antônio Augusto U. de Souza ◽  
Rui A.R. Boaventura ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Cation Exchanger ◽  
Breakthrough Curves ◽  
Marine Macroalgae

scholarly journals Reaction of Ion Exchange Resins with Fenton’s Reagent

Environments ◽  
2018 ◽  
Vol 5 (11) ◽  
pp. 123 ◽  
Author(s):  
Leandro de Araujo ◽  
Júlio Marumo
Keyword(s):  
Ion Exchange ◽  
Catalyst Concentration ◽  
Setting Time ◽  
Ion Exchange Resins ◽  
Experimental Conditions ◽  
Final Volume ◽  
Different Temperatures ◽  
Axial Compressive Strength ◽  
Exchange Resins ◽  
Two Parameters

One of the most common treatment methods for spent ion exchange resins is their immobilization in cement, which reduces the release of radionuclides into the environment. Although this method is efficient, it considerably increases the final volume of the waste due to its low incorporation capacity. This work aims to evaluate the degradation of ion exchange resins by the Fenton process (H2O2/Fe2+). The resin evaluated was a mixture of cationic and anionic resins, both non-radioactive. The reactions were conducted by varying the catalyst concentration (25, 50, 100, and 150 mmol L−1) and the volume of hydrogen peroxide. Three different temperatures were evaluated by varying the flow of reactants, which were 50, 60, and 70 °C. Cement specimens were prepared from the treated solutions and two parameters were assessed—namely, final setting time and axial compressive strength. The results showed that the experimental conditions were suitable to dissolve the resins, and the Fe3+ produced as precipitate during the experiments increased the resistance of the final product. The immobilized product complied with the limits established by regulation.

Ion Exchange Behavior of the Febex Bentonite: 2. Batch Experiments and Geochemical Modeling

2000 ◽  
Vol 663 ◽  
Author(s):  
J. Delgado ◽  
P. Carretero ◽  
R. Juncosa ◽  
J. Samper ◽  
F.J. Huertas ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Geochemical Modeling ◽  
Geochemical Evolution ◽  
Water Mixture ◽  
Total Inorganic Carbon ◽  
Exchange Reactions ◽  
Major Cations ◽  
Different Temperatures ◽  
Good Agreement

ABSTRACTIon exchange experiments have been performed with the FEBEX bentonite. Five grams of dry powder of this clay were put inside dialysis bags, which were located inside PFA reactors filled with 125 ml of water of a given chemical composition (Moody, Grimsel, and bentonitic-granitic type waters). The reactors containing the clay powder/water mixture were heated to different temperatures (from room temperature up to 80°C) along a time span ranging from 1 day to 1 year. Water was renewed according to a prescribed schedule but not the clay, which remained in place for the whole extent of each test. After each water renewal, major cations, silica, total inorganic carbon, and pH were analyzed. At the end of each test, the exchange complex and CEC of the bentonite were measured. These experiments have been modeled with a conveniently modified version of the EQ3/6 software package where ion exchange reactions were formulated as half reactions and added to its database. In general, model results are in fairly good agreement with experimental data, especially in the case of dissolved cations. Computed values of exchanged concentrations also match the measurements, although in some cases they deviate from them. The fact that the numerical results reproduce the observed patterns of exchange tests indicates that the adopted geochemical conceptual model is appropriate. Some features of the geochemical evolution of these tests also take place at the “mock-up” and “in situ” FEBEX tests.

Sign in / Sign up

Export Citation Format

Share Document