Details
| Original language | English |
|---|---|
| Pages (from-to) | 255-264 |
| Number of pages | 10 |
| Journal | Journal of contaminant hydrology |
| Volume | 47 |
| Issue number | 2-4 |
| Publication status | Published - 2001 |
Abstract
Sorption and diffusivity of iodide and pertechnetate (I- and TcO4-) on MX-80 bentonite with different hexadecylpyridinium (HDPy+) loadings were studied using equilibrium solutions of different ionic strengths. In HDPy+-modified bentonite, iodide and pertechnetate ions exhibited increasing sorption (characterized by the distribution ratio, Rd), while Cs+ and Sr2+ showed decreasing sorption with increasing organophilicity. In case of medium-loading levels, the simultaneous sorption of anions (I- and TcO4-) and cations (Cs+ and Sr2+) was observed.Sorption of ions was influenced by the composition of the electrolytes employed. It decreased gradually with increasing ionic strength of the electrolyte solutions.The experiments revealed the general tendency that the diffusivity (Da [cm2·s-1]) for iodide and pertechnetate decreases with increasing organophilicity and increases with increasing ionic strength of the equilibrium solutions, confirming the results of the sorption experiments.Additionally, some mineralogical and chemical investigations, like IR spectral analysis of the organo-bentonite samples and exchange behavior of HDPy+, were performed. On the basis of these analyses, it was concluded that the alkylammonium ions are sorbed as (1) HDPy+ cations, (2) HDPyCl molecules and (3) micelles with decreasing binding intensities in this order.
Keywords
- Anion-sorption, Diffusion, Iodine, Organo-clays, Radioactive waste, Technetium
ASJC Scopus subject areas
- Environmental Science(all)
- Environmental Chemistry
- Environmental Science(all)
- Water Science and Technology
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In: Journal of contaminant hydrology, Vol. 47, No. 2-4, 2001, p. 255-264.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Retardation capacity of organophilic bentonite for anionic fission products
AU - Riebe, B.
AU - Bors, J.
AU - Dultz, St
N1 - Funding information: The work was supported by the European Commission ‘Nuclear Fission Safety’ programme (1994–1998) under contract FI4WCT950012. The skillful experimental work by Gabriele Erb-Bunnenberg and Rüdiger Sachse is gratefully acknowledged.
PY - 2001
Y1 - 2001
N2 - Sorption and diffusivity of iodide and pertechnetate (I- and TcO4-) on MX-80 bentonite with different hexadecylpyridinium (HDPy+) loadings were studied using equilibrium solutions of different ionic strengths. In HDPy+-modified bentonite, iodide and pertechnetate ions exhibited increasing sorption (characterized by the distribution ratio, Rd), while Cs+ and Sr2+ showed decreasing sorption with increasing organophilicity. In case of medium-loading levels, the simultaneous sorption of anions (I- and TcO4-) and cations (Cs+ and Sr2+) was observed.Sorption of ions was influenced by the composition of the electrolytes employed. It decreased gradually with increasing ionic strength of the electrolyte solutions.The experiments revealed the general tendency that the diffusivity (Da [cm2·s-1]) for iodide and pertechnetate decreases with increasing organophilicity and increases with increasing ionic strength of the equilibrium solutions, confirming the results of the sorption experiments.Additionally, some mineralogical and chemical investigations, like IR spectral analysis of the organo-bentonite samples and exchange behavior of HDPy+, were performed. On the basis of these analyses, it was concluded that the alkylammonium ions are sorbed as (1) HDPy+ cations, (2) HDPyCl molecules and (3) micelles with decreasing binding intensities in this order.
AB - Sorption and diffusivity of iodide and pertechnetate (I- and TcO4-) on MX-80 bentonite with different hexadecylpyridinium (HDPy+) loadings were studied using equilibrium solutions of different ionic strengths. In HDPy+-modified bentonite, iodide and pertechnetate ions exhibited increasing sorption (characterized by the distribution ratio, Rd), while Cs+ and Sr2+ showed decreasing sorption with increasing organophilicity. In case of medium-loading levels, the simultaneous sorption of anions (I- and TcO4-) and cations (Cs+ and Sr2+) was observed.Sorption of ions was influenced by the composition of the electrolytes employed. It decreased gradually with increasing ionic strength of the electrolyte solutions.The experiments revealed the general tendency that the diffusivity (Da [cm2·s-1]) for iodide and pertechnetate decreases with increasing organophilicity and increases with increasing ionic strength of the equilibrium solutions, confirming the results of the sorption experiments.Additionally, some mineralogical and chemical investigations, like IR spectral analysis of the organo-bentonite samples and exchange behavior of HDPy+, were performed. On the basis of these analyses, it was concluded that the alkylammonium ions are sorbed as (1) HDPy+ cations, (2) HDPyCl molecules and (3) micelles with decreasing binding intensities in this order.
KW - Anion-sorption
KW - Diffusion
KW - Iodine
KW - Organo-clays
KW - Radioactive waste
KW - Technetium
UR - http://www.scopus.com/inward/record.url?scp=0035134131&partnerID=8YFLogxK
U2 - 10.1016/S0169-7722(00)00154-6
DO - 10.1016/S0169-7722(00)00154-6
M3 - Article
C2 - 11288581
AN - SCOPUS:0035134131
VL - 47
SP - 255
EP - 264
JO - Journal of contaminant hydrology
JF - Journal of contaminant hydrology
SN - 0169-7722
IS - 2-4
ER -