Cation and anion sorption capability of organophilic bentonite

verfasst von: J. Bors, St Dultz, B. Riebe
Abstract: Sorption experiments were performed with iodide, cesium and strontium ions on MX-80 Wyoming-bentonite treated with hexadecylpyridinium (HDPy⁺) in amounts equivalent to 0.2-4.0 times the cation exchange capacity (CEC) using ¹²⁵I^-, ¹³⁴Cs⁺ and ⁸⁵Sr²⁺ as tracers. In HDPy-bentonite, iodide exhibited increasing adsorption, while cesium and strontium ions showed decreasing adsorption with increasing organophilicity. It was also found that the Cs⁺ affinity to original and HDPy-bentonite was considerably higher than that of Sr²⁺ ions. HDPy⁺ uptake in increasing concentrations resulted in a pronounced expansion of the basal spacings (d₀₀₂ reflex at 2.78 nm) and in a change of the negative particle surface charge to positive values.
Organisationseinheit(en): Institut für Bodenkunde
AG Bodenchemie
Institut für Radioökologie und Strahlenschutz
Typ: Konferenzaufsatz in Fachzeitschrift
Journal: Materials Research Society Symposium - Proceedings
Band: 506
Seiten: [d]297-304
ISSN: 0272-9172
Publikationsdatum: 1997
Publikationsstatus: Veröffentlicht
Peer-reviewed: Ja
ASJC Scopus Sachgebiete: Allgemeine Materialwissenschaften, Physik der kondensierten Materie, Werkstoffmechanik, Maschinenbau
Elektronische Version(en): https://doi.org/10.1557/proc-506-297 (Zugang: Unbekannt)

BibTeX

@article{2f838202ba2341449aeadbf75831f14d,
title = "Cation and anion sorption capability of organophilic bentonite",
abstract = "Sorption experiments were performed with iodide, cesium and strontium ions on MX-80 Wyoming-bentonite treated with hexadecylpyridinium (HDPy+) in amounts equivalent to 0.2-4.0 times the cation exchange capacity (CEC) using 125I-, 134Cs+ and 85Sr2+ as tracers. In HDPy-bentonite, iodide exhibited increasing adsorption, while cesium and strontium ions showed decreasing adsorption with increasing organophilicity. It was also found that the Cs+ affinity to original and HDPy-bentonite was considerably higher than that of Sr2+ ions. HDPy+ uptake in increasing concentrations resulted in a pronounced expansion of the basal spacings (d002 reflex at 2.78 nm) and in a change of the negative particle surface charge to positive values.",
author = "J. Bors and St Dultz and B. Riebe",
note = "Funding information: The studies on organophilic bentonite are funded by the Nuclear Fission Safety Programme of the European Commission under the Project No. FI4WCT950012. The skilled thechnical assistance of Mr. K.-H. Iwannek is gratefully acknowledged.; 1997 Symposium on Scientific Basis for Nuclear Waste Management XXI ; Conference date: 28-09-1997 Through 03-10-1997",
year = "1997",
doi = "10.1557/proc-506-297",
language = "English",
volume = "506",
pages = "[d]297--304",
journal = "Materials Research Society Symposium - Proceedings",
issn = "0272-9172",
publisher = "Materials Research Society",
}