All issues
Volume 3 (1992)
- Issue 2 Pages 40-
- Issue 1 Pages 2-
Volume 3, Issue 2
Displaying 1-5 of 5 articles from this issue
- |<
- <
- 1
- >
- >|
-
[in Japanese]1992 Volume 3 Issue 2 Pages 40-50
Published: September 25, 1992
Released on J-STAGE: March 18, 2010
JOURNAL FREE ACCESSDownload PDF (16601K) -
Mitsuru Higa1992 Volume 3 Issue 2 Pages 51-60
Published: September 25, 1992
Released on J-STAGE: March 18, 2010
JOURNAL FREE ACCESSIon flux across an ion exchange membrane in multicomponent ion systems has been described by a theory based on the Donnan equilibrium and the Nernst-Planck equation of flux. The permeation cofficients of ions and membrane potential in various kinds of electrolyte systems were calculated by this theory and measured experimentally as a function of membrane change density. The results show that the counterion with the highest valence is the most important for ion permeation phenomena in a multicomponent ion system and that uphill transport of a bivalent counterion occurs because its concentration gradient in a changed membrane is in the opposite direction to its concentration gradient of external solutions. This phenomenon is applicable in a new mechanism to control ion transport direction.View full abstractDownload PDF (863K) -
Wataru Agui, Masahiko Kondo, Masahiko Abe, Keizo Ogino1992 Volume 3 Issue 2 Pages 61-68
Published: September 25, 1992
Released on J-STAGE: March 18, 2010
JOURNAL FREE ACCESSThe effect of HS on the ion exchange rate of SBAER was examined by measuring the mass-transfer coefficient (MTC) for chloride ions in the mixed resin's bed. As a result, the adsorbed amount of the HS dissolved in water on the SBAERs was larger than that of the HS dissolved in NaOH. Adsorption of the HS dissolved in water on the SBAERs gave no adverse effect to the ion exchange rate of them. The MTC of the gel-type resin showed a larger value than that of the macroreticular resin against the fouling with HS. As the adsorbed amount of the HS dissolved in 0.1N-NaOH increased on SBAERs, the ion exchange rate of the SBAERs decreased remarkably. These results suggest it should avoid that IERs are exposed to an excess fouling with ionic and high MW organic contaminants, in order to maintain stable demineralization rate and capacity in the water treatment.View full abstractDownload PDF (670K) -
Fumiaki Kawakami, Kazuo Yoshida, Masaru Sato, Kunihiko Takeda1992 Volume 3 Issue 2 Pages 69-80
Published: September 25, 1992
Released on J-STAGE: March 18, 2010
JOURNAL FREE ACCESSThe coordination numbers and ion exchange characteristics of Fe3+- Cl- complex ions adsorbed in a porous anion exchanger were measured to study the behavior of complex ions in an ion exchangers. The results demonstrated that the species of Fe3+-Cl- complex ion which had been adsorbed was [FeCl4] -, and that the adsorbed ions were localized in the “Donnan area”. Furthermore, the adsorption affinities based on Cl- (Δμ0r) of the adsorbed complex ions were estimated to be 14.3 and 15.8 kJ/ mol respectively for [FeCl4] - and [UO2Cl4] 2-. These values of Δμ0r were much larger than those of common non-complex anions. An analysis of the mechanism of adsorption using the thermodynamic equilibrium constant K indicated the ion exchange reactions were largely controlled by the osmotic pressure of the resin in the exchange of metal complex ions, and by the activity coefficient term in the exchange of Cl- and metal complex ions. These results suggest the peculiar behavior of complex ions adsorbed in an ion exchanger, which is similar to the accelerated rate of the electron exchange reaction shown by adsorbed ions in comparison with that observed with ions in solution.View full abstractDownload PDF (1188K) -
Setsu Kobayashi, Yoshiko Imai, Naohiro Satou, Asao Nakatsuka, Toshishi ...1992 Volume 3 Issue 2 Pages 81-88
Published: September 25, 1992
Released on J-STAGE: March 18, 2010
JOURNAL FREE ACCESSTerbium contained in the industrial waste sample was recovered by use of the chelating resin functionalized with diethylentriamine-polyacetic acids type ligand (CMA resin) . 2 mole dm-3 HCl solution made almost perfect dissolution of terbium from the waste sample. The chelating resin column was applied to separate terbium from the leaching solution at pH 3.5: The sample solution was passed through the colomn and then the retained metals were released from the colomn by elution with 0.2 mol dm-3 HCl. Terbium (III) was concentrated from 0.1 wt% to 70.3 wt% by the column operation, but the separation of terbium (III) from Co (II) and Fe (II) was not successful due to the mutual similarity of the distribution coefficients.
Oxalic acid was added to the eluate and pH of the solution was adjusted to modulate the oxalic ion concentration. Terbium oxalate free from Co (II) and Fe (II) could be precipitated. Upon calcination of the oxalate, terbium oxide was recovered as 99.7% purity.View full abstractDownload PDF (775K)
- |<
- <
- 1
- >
- >|