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A COMPARISON OF THE ADSORPTION OF CESIUM ON ZEOLITE MINERALS VS VERMICULITE
Clays and Clay Minerals ( IF 2.0 ) Pub Date : 2021-09-30 , DOI: 10.1007/s42860-021-00150-9
D. R. Ferreira 1 , G. D. Phillips 2 , B. Baruah 2
Affiliation  

Radiocesium was deposited on the soils of Fukushima Prefecture in Japan after the meltdown of the Fukushima Daiichi Nuclear Power Plant in 2011. The radiocesium bound to 2:1 clay minerals, such as vermiculite, common in the soil of that region and became non-exchangeable due to the strong affinity of these clay minerals for the Cs+ adsorbed. The current study generated adsorption envelopes for Cs+ on three zeolite minerals: zeolite Y, ZSM-5, and ferrierite. Two of these (ZSM-5 and ferrierite) caused monovalent cations to adsorb via a strong inner-sphere mechanism. A comparison of Cs+ adsorption on these zeolites to Na+ adsorption on the same zeolites showed that Cs+ adsorbs much more strongly than Na+, which is explained by its atomic properties. Despite the inner-sphere adsorption of Cs+ on ZSM-5 and ferrierite, the affinity of vermiculite for Cs+ is even stronger. An adsorption envelope for Cs+ on vermiculite failed to show a low-pH adsorption edge even at a pH of 1.01, with adsorption remaining at ~65% of the maximum even at this low pH. The adsorption envelopes for Cs+ on ZSM-5 and ferrierite minerals did show low-pH adsorption edges centered at pH 3.5 and 3.0, respectively, where Cs+ adsorption dropped to zero. The greater affinity of vermiculite for Cs+, even when compared with that for two zeolite minerals known to have significant affinities for monovalent ions, highlights the difficulty in removing Cs+ from contaminated Fukushima soils.



中文翻译:

铯对沸石矿物与蛭石的吸附比较

2011 年福岛第一核电站发生熔毁后,放射性铯沉积在日本福岛县的土壤上。放射性铯与该地区土壤中常见的 2:1 粘土矿物(如蛭石)结合,变得不可交换由于这些粘土矿物对吸附的 Cs +有很强的亲和力。目前的研究在三种沸石矿物上产生了 Cs + 的吸附包络:沸石 Y、ZSM-5 和镁碱沸石。其中两个(ZSM-5 和镁碱沸石)通过强大的内球机制导致单价阳离子吸附。CS的比较+吸附于这些沸石对Na +吸附在相同的沸石表明,铯+吸附强烈得多比的Na+,这是由其原子特性解释的。尽管 Cs +在 ZSM-5 和镁碱沸石上的内球吸附,蛭石对 Cs +的亲和力更强。即使在 1.01 的 pH 值下,蛭石上Cs +的吸附包络也未能显示出低 pH 值吸附边缘,即使在这种低 pH 值下,吸附仍保持在最大值的 65% 左右。ZSM-5 和镁碱沸石矿物上Cs +的吸附包络确实显示出分别以 pH 3.5 和 3.0 为中心的低 pH 吸附边缘,其中 Cs +吸附降至零。蛭石为Cs中更大的亲和力+,即使与已知对一价离子具有显着亲和力的两种沸石矿物相比,也凸显了从受污染的福岛土壤中去除 Cs +的难度。

更新日期:2021-10-01
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