Thermodynamic property changes in lanthanide(III) cation exchange reactions with poly(styrenesulfonic acid) type cation exchangers

1978 ◽  
Vol 82 (25) ◽  
pp. 2704-2709 ◽  
Author(s):  
G. E. Boyd
Keyword(s):  
Thermodynamic Property ◽  
Cation Exchange ◽  
Exchange Reactions ◽  
Acid Type ◽  
Cation Exchangers ◽  
Property Changes

CATION EXCHANGE IN ANHYDROUS ETHYLENEDIAMINE

1965 ◽  
Vol 43 (5) ◽  
pp. 1096-1101 ◽  
Author(s):  
Walter R. Heumann ◽  
Onil Dionne ◽  
Gilles Tremblay
Keyword(s):  
Aqueous Solutions ◽  
Cation Exchange ◽  
Alkali Metals ◽  
Cross Linking ◽  
Exchange Reactions ◽  
Degree Of Dissociation ◽  
Cation Exchangers ◽  
Low Degree ◽  
Acid Cation

The swelling of the strongly acid cation exchangers Dowex 50 W of various degrees of cross-linking is markedly less in ethylenediamine than in water. However, it is sufficient for exchange reactions to occur. In contrast with aqueous solutions, electrolytes dissolved in ethylenediamine cause the swelling to increase, which is attributed to the low degree of dissociation attainable in this solvent. This explanation is supported by the observation that in water slightly dissociated electrolytes also produce a slight increase in swelling. Exchange reactions were carried out successfully with the slightly cross-linked resin Dowex 50 W-X2. The bromide, ethoxide, aminoethoxide, and 2-aminoethylamide of lithium exchanged the latter cation with other alkali metals or tetrabutylammonium easily.

Facile Synthesis of Colloidal Zn3X2 (X = P, As) Quantum Dots: Transformation into (InyZn1-y)3X2 via Cation-Exchange Reactions

Nanoscale ◽  
2021 ◽  
Author(s):  
Sang-Wook Kim ◽  
Seungmin Baek ◽  
Jin-Soo Ha ◽  
Sungwoo Kim
Keyword(s):  
Quantum Dots ◽  
Cation Exchange ◽  
Environmentally Friendly ◽  
Exchange Reactions ◽  
Facile Synthesis ◽  
Organometallic Precursor

We firstly synthesized uniform Zn3X2 (X=P, As) quantum dots (QDs) using stable, environmentally friendly zinc precursor instead of organometallic precursor such as Me2Zn or Et2Zn, and controlled the QD size...

scholarly journals Exchange Characteristics of Lead, Zinc, and Cadmium in Selected Tropical Soils

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
Tope O. Bolanle-Ojo ◽  
Abiodun D. Joshua ◽  
Opeyemi A. Agbo-Adediran ◽  
Ademola S. Ogundana ◽  
Kayode A. Aiyeyika ◽  
...  
Keyword(s):  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Tropical Soils ◽  
Exchange Capacity ◽  
Exchange Reactions ◽  
Soil System ◽  
Soil Systems ◽  
Wide Range ◽  
Lead Zinc ◽  
High Base

Conducting binary-exchange experiments is a common way to identify cationic preferences of exchangeable phases in soil. Cation exchange reactions and thermodynamic studies of Pb2+/Ca2+, Cd2+/Ca2+, and Zn2+/Ca2+were carried out on three surface (0–30 cm) soil samples from Adamawa and Niger States in Nigeria using the batch method. The physicochemical properties studies of the soils showed that the soils have neutral pH values, low organic matter contents, low exchangeable bases, and low effective cation exchange capacity (mean: 3.27 cmolc kg−1) but relatively high base saturations (≫50%) with an average of 75.9%. The amount of cations sorbed in all cases did not exceed the soils cation exchange capacity (CEC) values, except for Pb sorption in the entisol-AD2 and alfisol-AD3, where the CEC were exceeded at high Pb loading. Calculated selectivity coefficients were greater than unity across a wide range of exchanger phase composition, indicating a preference for these cations over Ca2+. TheKeqvalues obtained in this work were all positive, indicating that the exchange reactions were favoured and equally feasible. These values indicated that the Ca/soil systems were readily converted to the cation/soil system. The thermodynamic parameters calculated for the exchange of these cations were generally low, but values suggest spontaneous reactions.

scholarly journals Tuning infrared plasmon resonances in doped metal-oxide nanocrystals through cation-exchange reactions

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Zeke Liu ◽  
Yaxu Zhong ◽  
Ibrahim Shafei ◽  
Ryan Borman ◽  
Soojin Jeong ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Cation Exchange ◽  
Exchange Reactions ◽  
Plasmon Resonances

Binary Cation-Exchange Reactions

1998 ◽  
Vol 46 (2) ◽  
pp. 215-218 ◽  
Author(s):  
Ronald K. Stoessell
Keyword(s):  
Cation Exchange ◽  
Exchange Reactions

Reactions of smectites with binuclear oxobridged iron complexes of N-alkyl-N,N-bis (2-pyridylmethyl)amines

Clay Minerals ◽  
1998 ◽  
Vol 33 (1) ◽  
pp. 35-42 ◽  
Author(s):  
S. Dick ◽  
A. Weiss
Keyword(s):  
Cation Exchange ◽  
Iron Complexes ◽  
Layer Charge ◽  
Exchange Reactions ◽  
Internal Surfaces ◽  
Small Complex ◽  
Interlayer Region

AbstractCationic binuclear oxo- and carboxylate bridged Fe(III) complexes of N-alkyl-N,Nbis(2-pyridylmethyl)amines are introduced into the interlayer region of smectites by cation exchange reactions. The reaction can be divided into three steps. After a predominant loading of external surfaces, cation exchange sites at internal surfaces react, accompanied by considerable stmctaral expansion. Both reaction stages belong to the steep section of the exchange isotherms. At a certain loading, which depends on the complex substituents and the layer charge of the smectite, the isotherms become flat. With bulky shaped complex cations and highly charged smectites, exchange is not quantitative; vermiculite-type minerals show a very small complex uptake. For this behaviour, both thermodynamic and kinetic reasons must be considered. From these results the number of cation exchange positions at external surfaces of smectite crystals may be estimated.

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