Details
| Original language | English |
|---|---|
| Pages (from-to) | 9-16 |
| Number of pages | 8 |
| Journal | Applied clay science |
| Volume | 28 |
| Issue number | 1-4 SPEC. ISS. |
| Publication status | Published - Jan 2005 |
Abstract
The sorptive capability of clay minerals for anionic radionuclides can be improved substantially by exchanging the natural inorganic interlayer cations with certain organic cations. After screening a variety of possible candidates, four organic cations were selected and combined with three clay minerals, providing 12 organo-cation/clay mineral combinations. The samples were tested for anion adsorption in batch experiments with radioiodide in a concentration range of 10-2 to 10-9 mol l-1 and exhibited high adsorption in bidistilled water as well as in synthetic groundwater. Results for two clay minerals - a smectite and a vermiculite - and four organic cations are given in this paper. Tests were also performed with temperature pretreated material. An increase of the pretreatment temperature from 20 to 40, 60, 80 and 100 °C did not result in a remarkable effect on iodide adsorption, except for the 1,12-dipyridiniododecan/vermiculite combination. In batch experiments with equilibrium temperatures of 20-60 °C, iodide adsorption decreased slightly with increasing temperature. Only 1,12-dipyridiniododecan in combination with smectite and vermiculite showed a somewhat lower iodide adsorption at higher temperatures.
Keywords
- Anion adsorption, Organo-clay minerals, Radioactive waste
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geology
- Earth and Planetary Sciences(all)
- Geochemistry and Petrology
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: Applied clay science, Vol. 28, No. 1-4 SPEC. ISS., 01.2005, p. 9-16.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Temperature effects on iodine adsorption on organo-clay minerals - I. Influence of pretreatment and absorption temperature
AU - Riebe, Beate
AU - Dultz, Stefan
AU - Bunnenberg, Claus
N1 - Funding information: The authors wish to acknowledge gratefully the assistance of Gabriele Erb-Bunnenberg and Monika Gorny with the experimental work. The work was supported by the Federal Ministry for Economic Affairs and Employment (BMWA) under contract 02 E 9481.
PY - 2005/1
Y1 - 2005/1
N2 - The sorptive capability of clay minerals for anionic radionuclides can be improved substantially by exchanging the natural inorganic interlayer cations with certain organic cations. After screening a variety of possible candidates, four organic cations were selected and combined with three clay minerals, providing 12 organo-cation/clay mineral combinations. The samples were tested for anion adsorption in batch experiments with radioiodide in a concentration range of 10-2 to 10-9 mol l-1 and exhibited high adsorption in bidistilled water as well as in synthetic groundwater. Results for two clay minerals - a smectite and a vermiculite - and four organic cations are given in this paper. Tests were also performed with temperature pretreated material. An increase of the pretreatment temperature from 20 to 40, 60, 80 and 100 °C did not result in a remarkable effect on iodide adsorption, except for the 1,12-dipyridiniododecan/vermiculite combination. In batch experiments with equilibrium temperatures of 20-60 °C, iodide adsorption decreased slightly with increasing temperature. Only 1,12-dipyridiniododecan in combination with smectite and vermiculite showed a somewhat lower iodide adsorption at higher temperatures.
AB - The sorptive capability of clay minerals for anionic radionuclides can be improved substantially by exchanging the natural inorganic interlayer cations with certain organic cations. After screening a variety of possible candidates, four organic cations were selected and combined with three clay minerals, providing 12 organo-cation/clay mineral combinations. The samples were tested for anion adsorption in batch experiments with radioiodide in a concentration range of 10-2 to 10-9 mol l-1 and exhibited high adsorption in bidistilled water as well as in synthetic groundwater. Results for two clay minerals - a smectite and a vermiculite - and four organic cations are given in this paper. Tests were also performed with temperature pretreated material. An increase of the pretreatment temperature from 20 to 40, 60, 80 and 100 °C did not result in a remarkable effect on iodide adsorption, except for the 1,12-dipyridiniododecan/vermiculite combination. In batch experiments with equilibrium temperatures of 20-60 °C, iodide adsorption decreased slightly with increasing temperature. Only 1,12-dipyridiniododecan in combination with smectite and vermiculite showed a somewhat lower iodide adsorption at higher temperatures.
KW - Anion adsorption
KW - Organo-clay minerals
KW - Radioactive waste
UR - http://www.scopus.com/inward/record.url?scp=11044221114&partnerID=8YFLogxK
U2 - 10.1016/j.clay.2004.01.004
DO - 10.1016/j.clay.2004.01.004
M3 - Article
AN - SCOPUS:11044221114
VL - 28
SP - 9
EP - 16
JO - Applied clay science
JF - Applied clay science
SN - 0169-1317
IS - 1-4 SPEC. ISS.
ER -