Simultaneous removal of the radiotoxic nuclides Cs137 and I129 from aqueous solution
Simultaneous removal of the radiotoxic nuclides Cs137 and I129 from aqueous solution
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DOI：
10.1016/s1383-5866(97)00045-2
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发表时间：
1997-12
影响因子：
8.6
通讯作者：
K. Song;Hoo-Kun Lee;H. Moon;Kunjai Lee
中科院分区：
文献类型：
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作者：
K. Song;Hoo-Kun Lee;H. Moon;Kunjai Lee
本文研究了从放射性废液中同时去除阳离子和阴离子放射性毒性核素Cs ~（137）和I ~（129）的方法。作为吸附材料，使用活性炭和菱沸石的混合物。在Cs+和I−浓度比最保守的条件下，发现活性炭与菱沸石的混合比为7：3（重量分数）是最佳的。实验数据和表面分析表明，Cs+吸附在活性炭表面对I−的吸附产生协同效应。背景电解质，即Na+和Cl−，对Cs+等温线的影响在整个平衡浓度范围内是微小的，而对I−等温线的影响在较低的平衡浓度下更大。提出了一个基于表面扩散和竞争吸附的动力学模型。用该动力学模型对Cs+和I-在混合吸附剂柱中的穿透行为进行了预测。
The simultaneous removal of cationic and anionic radiotoxic nuclides such as Cs137and I129from radioactive liquid wastes has been studied. As an adsorbent material, the mixture of activated carbon and chabazite zeolite was used. The mixing ratio of 7:3 of activated carbon to chabazite in weight fraction was found to be optimum under the most conservative condition for the Cs+and I−concentration ratio. Experimental data and surface analysis indicated that Cs+adsorbed onto the activated carbon surface caused a synergistic effect on the adsorption of I−. The effect of background electrolytes, namely Na+and Cl−, on the Cs+isotherm was minute over the whole range of equilibrium concentrations, whereas that on the I−isotherm was greater at lower equilibrium concentrations. A dynamic model was proposed, based on surface diffusion and competitive adsorption. The breakthrough behaviors of Cs+and I−in the column, charged with the mixed adsorbent, were predicted satisfactorily by the proposed dynamic model.