蛭石化黑云母结合点位中 NH、K、Mg 和 Ca 对铯吸附/解吸的影响。
Effects of NH, K, Mg, and Ca on the Cesium Adsorption/Desorption in Binding Sites of Vermiculitized Biotite.
机构信息
Laboratory for Advanced Nuclear Energy, Tokyo Institute of Technology , 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8550, Japan.
College of Resources and Metallurgy, Guangxi University , 100 Daxue East Road, Nanning 530004, People's Republic of China.
出版信息
Environ Sci Technol. 2017 Dec 5;51(23):13886-13894. doi: 10.1021/acs.est.7b04922. Epub 2017 Nov 22.
The reversibility of cesium adsorption in contaminated soil is largely dependent on its interaction with micaceous minerals, which may be greatly influenced by various cations. Herein, we systematically investigated the effects of NH, K, Mg, and Ca on the adsorption/desorption of Cs into different binding sites of vermiculitized biotite (VB). Original VB was initially saturated by NH, K, or Mg; we then evaluated the adsorption of Cs on three treated VBs, and the desorption by extraction with NH, K, Mg, or Ca was further evaluated. Our structural analysis and Cs extractability determinations showed that NH and K both collapsed the interlayers of VB, resulting in the dominant adsorption of Cs to external surface sites on which Cs was readily extracted by NH, K, Mg, or Ca irrespective of their species, whereas Mg maintained the VB with expanded interlayers, leading to the overwhelming adsorption of Cs in collapsed interlayer sites on which the Cs desorption was difficult and varied significantly by the cations used in extraction. The order of Cs extraction ability from the collapsed interlayers was K ≫ Mg ≈ Ca ≫ NH. These results could provide important insights into Cs migration in soil and its decontamination for soil remediation.
Cs 在污染土壤中的吸附可逆性在很大程度上取决于其与云母矿物的相互作用，而云母矿物可能会受到各种阳离子的极大影响。在此，我们系统地研究了 NH、K、Mg 和 Ca 对进入蛭石化黑云母（VB）不同结合位的 Cs 吸附/解吸的影响。原始 VB 最初被 NH、K 或 Mg 饱和；然后我们评估了 Cs 在三种处理过的 VB 上的吸附，并用 NH、K、Mg 或 Ca 进一步评估了 Cs 的解吸。我们的结构分析和 Cs 可提取性测定表明，NH 和 K 都使 VB 的层间坍塌，导致 Cs 主要吸附在外层表面上，而 NH、K、Mg 或 Ca 均可轻易地将其提取出来，而不管它们的种类如何，而 Mg 则保持 VB 的层间扩张，导致 Cs 在坍塌的层间位上的吸附占主导地位，而 Cs 的解吸则很困难，且受提取用阳离子的影响差异很大。从坍塌的层间提取 Cs 的能力顺序为 K＞Mg≈Ca＞NH。这些结果可以为土壤中 Cs 的迁移及其在土壤修复中的去污提供重要的见解。
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