ChemInform Abstract: Kinetic Studies of Complexation Reactions Between Alkali Ions and Crown Ethers in Various Solvents

ChemInform ◽  
1989 ◽  
Vol 20 (33) ◽  
Author(s):  
M. SHAMSIPUR
Keyword(s):  
Crown Ethers ◽  
Kinetic Studies ◽  
Alkali Ions ◽  
Complexation Reactions

Potential of polymethacrylate pseudo crown ethers as solid state polymer electrolytes

2017 ◽  
Vol 53 (51) ◽  
pp. 6899-6902 ◽  
Author(s):  
S. Moins ◽  
J. C. Martins ◽  
A. Krumpmann ◽  
V. Lemaur ◽  
J. Cornil ◽  
...  
Keyword(s):  
Solid State ◽  
Dft Calculations ◽  
Crown Ethers ◽  
Polymer Electrolytes ◽  
Kinetic Studies

The association of kinetic studies, DFT calculations and 1H–7Li NMR analyses allowed the control of the cyclo-ATRP of PEG9DMA and the production of polymethacrylate pseudo crown-ethers of various molar masses.

Mechanism of complexation of crown ethers as a function of alkali ions and the rigidity of the ligands

1985 ◽  
Vol 89 (8) ◽  
pp. 1357-1366 ◽  
Author(s):  
William Wallace ◽  
Cindy Chen ◽  
Edward M. Eyring ◽  
Sergio Petrucci
Keyword(s):  
Crown Ethers ◽  
Alkali Ions

Application of polymer-sepiolite composites for adsorption of Cu(II) and Ni(II) from aqueous solution: equilibrium and kinetic studies

e-Polymers ◽  
2018 ◽  
Vol 18 (3) ◽  
pp. 217-228 ◽  
Author(s):  
Amir Vahedi ◽  
Mohammadreza Rahmani ◽  
Zahra Rahmani ◽  
Mohammadali Moghaddasi ◽  
Farid Talebnia Rowshan ◽  
...  
Keyword(s):  
Metal Ions ◽  
Freundlich Isotherm ◽  
Kinetic Studies ◽  
Adsorption Of Metal Ions ◽  
Equilibrium Data ◽  
Best Fitting ◽  
Pseudo Second Order ◽  
Removal Of Metal Ions ◽  
Complexation Reactions ◽  
Modified Polyacrylamide

AbstractIn this study, humic acid-immobilized-amine-modified polyacrylamide/sepiolite (Ha-Am-Paa-Sep) and phytic acid-modified polyacrylamide/sepiolite composites (Phy-Paa-Sep) were prepared and characterized for removal of Cu(II) and Ni(II) from aqueous solutions. The effects of contact time, initial concentration of adsorbent and metal ions, pH and temperature on the adsorption process were investigated. The optimum adsorption of metal ions occurred at pH 5 and 25°C. Ion exchange and complexation reactions were the main mechanisms for adsorption of metal ions. Removal of metal ions followed a pseudo-second-order kinetics and equilibrium occurred after 60 min. The conformity of various adsorption models to the equilibrium data was evaluated among which Freundlich isotherm model gave the best fitting result. The highest monolayer adsorption capacity of Cu(II) and Ni(II) ions were 244 and 250 mg·g−1 for Ha-Am-Paa-Sep and 256.4 and 277 mg·g−1 for Phy-Paa-Sep, respectively, at room temperature. Ultimately, desorption experiments were performed and the results showed approximately 95% of adsorbed metal ions were desorbed.

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