ABSTRACT This study investigated cesium (Cs) sorption and retention by 4 types of minerals, which were considered as candidate sorbents to prevent radiocesium leaching from landfill sites containing radiocesium wastes. Feldspar, 2 types of illite, and natural zeolite were examined for sorption of stable Cs under deionized water or landfill leachate conditions. In the pH range of 6 to 11, feldspar had a large effect on Cs sorption, but the other minerals did not. The sorption isotherms were obtained using 2 types of Cs solutions, which were fit to the Freundlich model. The difference of Freundlich exponent between the 2 types of Cs solutions was attributed to the sorption mechanisms of the minerals. These minerals had two or more types of sorption sites for cations; however, one specific type of site had a potentially higher selectivity for Cs in the leachate. Additionally, extraction test results showed that retention capacity for Cs in the leachate decreased in the following order: natural zeolite > illite Y > illite W > feldspar. Although illite W and illite Y were identified as the same mineral by XRD analysis, they had different retention capacities described as radiocesium interception potential, which is an index of the number of specific sites for Cs.

中文翻译：

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pH 值和溶液化学成分对长石、伊利石和沸石作为垃圾渗滤液中铯吸附剂的吸附和保留的影响

摘要 本研究调查了 4 种矿物质对铯 (Cs) 的吸附和保留，这些矿物质被认为是防止放射性铯从含有放射性铯废物的垃圾填埋场浸出的候选吸附剂。在去离子水或垃圾渗滤液条件下，研究了长石、两种伊利石和天然沸石对稳定 Cs 的吸附。在 6 到 11 的 pH 值范围内，长石对 Cs 吸附有很大影响，但其他矿物没有。使用符合 Freundlich 模型的 2 种 Cs 溶液获得吸附等温线。两种Cs溶液之间Freundlich指数的差异归因于矿物的吸附机制。这些矿物有两种或两种以上的阳离子吸附位点；然而，一种特定类型的场地对渗滤液中的 Cs 具有潜在更高的选择性。此外，提取试验结果表明，浸出液中Cs的截留量按以下顺序下降：天然沸石>伊利石Y>伊利石W>长石。尽管通过 XRD 分析将伊利石 W​​ 和伊利石 Y 确定为相同的矿物，但它们具有不同的保留能力，被描述为放射性铯拦截潜力，这是 Cs 特定位点数量的指标。