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.

Electrolytic denitrification with an ion-exchange membrane in groundwater

2015 ◽  
Vol 15 (6) ◽  
pp. 1320-1325 ◽  
Author(s):  
Yoo Jin Kim ◽  
Kwanyong Lee ◽  
Ho Young Cha ◽  
Kyung Min Yoo ◽  
Chil Sung Jeon ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Rural Areas ◽  
Nitrate Removal ◽  
Nitrate Contamination ◽  
Ion Exchange Membrane ◽  
Cathode Side ◽  
Reversible Reactions ◽  
Selective Membrane ◽  
Laboratory Reactor ◽  
Exchange Membrane

Nitrate contamination of groundwater is an important issue in rural areas. In this study, an electrolytic method for the denitrification of groundwater was investigated in a laboratory reactor. We used an ion-exchange membrane, employing a titanium oxide anode and five kinds of cathode for the investigation. The nitrate removal efficiencies with Cu, Pb, Ti/Ir/Ru, Ti/Ir/Ta, and Zn cathodes were 30.0%, 59.9%, 73.8%, 23.3%, and 80.6%, respectively. A cation-selective membrane was employed to separate the electrode compartments, and only the proton produced in the anode side was permitted to the cathode side in order to avoid reversible reactions. In terms of the nitrate removal, good experimental results were obtained by using the membrane reactor equipped with the Zn cathode. The nitrate concentration level dropped from 30 to 6 mg/L, which is below the limit for drinking water. The pH was not affected significantly by the current density and it increased up to 9.0 at 100 mA/cm2. The nitrate removal efficiency showed the highest value with 1 mM of NaCl as an electrolyte. The impression was that membrane electrolysis made it possible to avoid the re-oxidation problem. It appears clear that electrolytic denitrification with an ion-exchange membrane is a very effective process with a mean energy consumption of only between 26.9 and 112.9 kWh/kg-NO3.

The role of ion exchange membrane in vanadium oxygen fuel cell

2021 ◽  
Vol 629 ◽  
pp. 119271
Author(s):  
Jiří Charvát ◽  
Petr Mazúr ◽  
Martin Paidar ◽  
Jaromír Pocedič ◽  
Jiří Vrána ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Ion Exchange ◽  
Ion Exchange Membrane ◽  
Exchange Membrane ◽  
Oxygen Fuel

scholarly journals Transparent Ion-Exchange Membrane Exhibiting Intense Emission under a Specific pH Condition Based on Polypyridyl Ruthenium(II) Complex with Two Imidazophenanthroline Groups

Membranes ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 400
Author(s):  
Hajime Kamebuchi ◽  
Satoshi Tamaki ◽  
Atsushi Okazawa ◽  
Norimichi Kojima
Keyword(s):  
Ion Exchange ◽  
Emission Intensity ◽  
Density Functional ◽  
Emission Spectra ◽  
Density Functional Theory Calculations ◽  
Ion Exchange Membrane ◽  
Quantum Yields ◽  
Relative Emission Intensity ◽  
Nafion Film ◽  
Exchange Membrane

The development and the photophysical behavior of a transparent ion-exchange membrane based on a pH-sensitive polypyridyl ruthenium(II) complex, [(bpy)2RuII(H2bpib)RuII(bpy)2](ClO4)4 (bpy = 2,2′-bipyridine, H2bpib = 1,4-bis([1,10]phenanthroline[5,6-d]-imidazol-2-yl)benzene), are experimentally and theoretically reported. The emission spectra of [(bpy)2RuII(H2bpib)RuII(bpy)2]@Nafion film were observed between pH 2 and pH 11 and showed the highest relative emission intensity at pH 5 (λmaxem = 594.4 nm). The relative emission intensity of the film significantly decreased down to 75% at pH 2 and 11 compared to that of pH 5. The quantum yields (Φ) and lifetimes (τ) showed similar correlations with respect to pH, Φ = 0.13 and τ = 1237 ns at pH 5, and Φ = 0.087 and τ = 1014 ns and Φ = 0.069 and τ = 954 ns at pH 2 and pH 11, respectively. These photophysical data are overall considerably superior to those of the solution, with the radiative- (kr) and non-radiative rate constants (knr) at pH 5 estimated to be kr = 1.06 × 105 s−1 and knr = 7.03 × 105 s−1. Density functional theory calculations suggested the contribution of ligand-to-ligand- and intraligand charge transfer to the imidazolium moiety in Ru-H3bpib species, implying that the positive charge on the H3bpib ligand works as a quencher. The Ru-Hbpib species seems to enhance non-radiative deactivation by reducing the energy of the upper-lying metal-centered excited state. These would be responsible for the pH-dependent “off-on-off” emission behavior.

Synthesis of ion exchange membrane by radiation grafting of acrylic acid onto polyethylene

1981 ◽  
Vol 18 (5-6) ◽  
pp. 899-905 ◽  
Author(s):  
I. Ishigaki ◽  
T. Sugo ◽  
K. Senoo ◽  
T. Takayama ◽  
S. Machi ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Acrylic Acid ◽  
Ion Exchange Membrane ◽  
Radiation Grafting ◽  
Exchange Membrane

scholarly journals Effect of Cationic Charge in Electrolyte-Amphoteric Ion-Exchange Membrane System

1987 ◽  
Vol 60 (6) ◽  
pp. 2215-2219 ◽  
Author(s):  
Yutaka Hirata ◽  
Masashi Date ◽  
Yukiko Yamamoto ◽  
Akira Yamauchi ◽  
Hideo Kimizuka
Keyword(s):  
Ion Exchange ◽  
Membrane System ◽  
Ion Exchange Membrane ◽  
Exchange Membrane
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