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• W2573998266 abstract "Smectites and vermiculites modified with hexadecylpyridinium (HDPy + ), hexadecyltrimethylammonium (HDTMA + ), benzethonium (BE + ) and dipyridinododecane (DPyDD 2+ ) cations exhibit high adsorption capabilities for the anionic radionuclide 125 I − (Part I of this article). In some cases, exposure to higher temperature decreased the anion adsorption . To clarify the mechanisms of temperature dependence of the investigated organo-clay minerals, structural properties and thermal stabilities were examined by in situ powder X-ray diffraction (XRD), thermogravimetry (TG), thermocalorimetry (DTA) and FTIR spectral analyses. The organic cations HDPy, HDTMA and BE form bilayers, pseudotrimolecular layers and paraffin-type structures. The basal spacings of DPyDD-smectite and DPyDD-vermiculite were more or less unchanged in comparison to the original clay minerals (∼1.4 nm). It is assumed that the anion adsorption is due to the uptake of organic cations in an excess of the CEC, predominantly in the interlayer spaces as ion pairs . The decreasing iodide adsorption with increasing temperature is probably due to conformational changes of the alkyl chains, which are most pronounced for DPyDD-vermiculite at 60 °C (1.48→1.20 nm). Additionally, dehydration reactions , which occur at distinct temperatures for the organo-vermiculites (HDPy, 71; HDTMA, 57, 72; BE, 61; DPyDD, 41 °C), may be another reason for a decrease in iodide adsorption. The thermal decomposition of the organic cation starts at 200 °C. The HDPy, HDTMA and DPyDD-smectites and the HDTMA and BE-vermiculites show a high thermal stability with the basal spacing remaining constant up to 150 °C, which recommends the use for anion retention in engineered barriers for heat-producing waste." @default.
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• W2573998266 date "2005-01-01" @default.
• W2573998266 modified "2023-09-27" @default.
• W2573998266 title "Temperature effects on iodine adsorption on organo-clay minerals" @default.
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• W2573998266 doi "https://doi.org/10.1016/j.clay.2004.01.005" @default.
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