scholarly journals Enthalpies and Entropies of Ion-Exchange Reactions

1955 ◽  
Vol 8 (1) ◽  
pp. 1 ◽  
Author(s):  
JF Duncan
Keyword(s):  
Ion Exchange ◽  
Hydrogen Ion ◽  
Exchange Reactions ◽  
Similar Treatment ◽  
Ion Exchange Reaction ◽  
Chemical Potentials ◽  
Sodium Hydrogen ◽  
Different Temperatures ◽  
Barium Ion ◽  
High Concentrations

By use of exchange isotherms determined at different temperatures, the chemical potentials and partial molar heats and entropies of the sodium-hydrogen ion-exchange reaction on a sulphonated polystyrene exchanger are evaluated. These show that both species are almost completely ionized in the exchanger, and very similar to their states in aqueous solution. In the high concentrations obtainable in the exchanger, however, there is some cation-cation interaction, which is practically linear with composition. A similar treatment of the barium-hydrogen system indicates that there is some interaction between the barium ion and the resinate structure.

scholarly journals Platelet sodium/hydrogen ion exchange in normal pregnancy and non-proteinuric pre-eclampsia

1997 ◽  
Vol 11 (7) ◽  
pp. 453-458 ◽  
Author(s):  
D Graham ◽  
JCP Kingdom ◽  
J McDonald ◽  
DL Davies ◽  
CJ Kenyon
Keyword(s):  
Ion Exchange ◽  
Normal Pregnancy ◽  
Hydrogen Ion ◽  
Sodium Hydrogen

Dispersion Attendant Sodium/ Hydrogen Ion Exchange in Reservoir Sands

1986 ◽  
Vol 1 (06) ◽  
pp. 607-610
Author(s):  
J.A. Jensen ◽  
J.V. Gillis ◽  
C.J. Radke
Keyword(s):  
Ion Exchange ◽  
Hydrogen Ion ◽  
Sodium Hydrogen

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.

Ion Exchange of Layer Structured Crystal KxTi2-xFexO4 (x = 0.80) and its Application as Cathode Material in a Rechargeable Lithium Battery

2008 ◽  
Vol 388 ◽  
pp. 97-100 ◽  
Author(s):  
Masao Ohashi
Keyword(s):  
Solid State ◽  
Ion Exchange ◽  
Lithium Battery ◽  
Interlayer Space ◽  
Hydrogen Ion ◽  
Exchange Reactions ◽  
Interlayer Water ◽  
Voltage Range ◽  
Rechargeable Lithium Battery ◽  
Exchange Product

The layer structured titanate KxTi2-xFexO4 (x = 0.80) with the lepidocrocite (-FeOOH) type structure has been prepared in a solid state reaction using K2CO3, anatase type TiO2 and -Fe2O3 at 1373 K. Ion exchange reactions of K+ in the interlayer space were studied in aqueouse solutions. The host layers of the titanate were maintained on the ion exchange reactions and the resulting products were found to contain interlayer water. The interlayer water in the hydrogen ion exchange product was removed by heating at 383 K in a vacuum. The resulting titanate H0.79K0.01Ti1.20Fe0.80O4 was evaluated for its use as the cathode in a rechargeable lithium battery. The cathode exhibited discharge and charge capacities of 107 and 69 mAh/g for the first cycle in the voltage range of 1.5 - 4.2 V.

Tailoring the photocatalytic activity of layered perovskites by opening the interlayer vacancy via ion-exchange reactions

CrystEngComm ◽  
2015 ◽  
Vol 17 (45) ◽  
pp. 8703-8709 ◽  
Author(s):  
Yingqi Wang ◽  
Xiaofang Lai ◽  
Xujie Lü ◽  
Yanting Li ◽  
Qinglong Liu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Ion Exchange ◽  
Exchange Reaction ◽  
Underlying Mechanism ◽  
Effective Model ◽  
Layered Perovskite ◽  
Exchange Reactions ◽  
Ion Exchange Reaction ◽  
Improved Performance ◽  
Layered Perovskites

The photocatalytic activity of the layered perovskite K2La2Ti3O10 was regulated by an ion-exchange reaction with a series of cations – Ca2+, Sr2+, and Ba2+. The underlying mechanism of the improved performance and an effective model for designing the photocatalyst were discussed.

76 Sodium-hydrogen ion exchange in normal pregnancy and pregnancy-induced hypertension

1993 ◽  
Vol 11 (5) ◽  
pp. S430
Author(s):  
D. Graham ◽  
J. McDonald ◽  
J. Kingdom ◽  
D. L. Davies ◽  
C. J. Kenyon
Keyword(s):  
Ion Exchange ◽  
Normal Pregnancy ◽  
Hydrogen Ion ◽  
Pregnancy Induced Hypertension ◽  
Sodium Hydrogen ◽  
Induced Hypertension
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