Temperature effects on iodine adsorption on organo-clay minerals: I. Influence of pretreatment and adsorption temperature
Temperature effects on iodine adsorption on organo-clay minerals: I. Influence of pretreatment and adsorption temperature
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DOI：
10.1016/j.clay.2004.01.004
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发表时间：
2005
影响因子：
5.6
通讯作者：
B. Riebe;S. Dultz;C. Bunnenberg
中科院分区：
文献类型：
--
作者：
B. Riebe;S. Dultz;C. Bunnenberg
粘土矿物对阴离子放射性核素的吸附能力可以通过将天然无机层间阳离子与某些有机阳离子进行交换而得到显著提高。在筛选了各种可能的候选者后，选择了4个有机阳离子与3种粘土矿物结合，提供了12种有机阳离子/粘土矿物组合。样品在10−2~10−9mol L−1的浓度范围内进行了间歇实验，在双蒸馏水和人工地下水中表现出较高的吸附性能。本文给出了两种粘土矿物--一种蒙脱石和一种蛭石--和四种有机阳离子的测定结果。还对温度处理过的材料进行了测试。温度从20℃升高到40℃、60℃、80℃和100℃时，除1，12-联吡啶十二烷/蛭石组合外，对碘离子的吸附没有显著影响。在平衡温度为20~60℃的间歇实验中，随着温度的升高，对碘的吸附略有下降。在较高温度下，只有1，12-联吡啶十二烷与蒙脱石和蛭石结合时，对碘的吸附较低。
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 10−2to 10−9mol l−1and 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.