Adsorption behavior of radioactive cesium by non-mica minerals
Adsorption behavior of radioactive cesium by non-mica minerals
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DOI：
10.1080/00223131.2013.773164
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发表时间：
2013-04-01
影响因子：
1.2
通讯作者：
Kozai, Naofumi
中科院分区：
文献类型：
--
作者：
Ohnuki, Toshihiko;Kozai, Naofumi
研究了高岭石、埃洛石、蒙脱石、丝光沸石、MnO 2、TiO 2、Al 2 O3和FeOOH等非云母矿物对放射性铯（Cs）的吸附行为，以阐明日本东北地区福岛第一核电站放射性铯沉降物的环境行为。Cs在矿物上的吸附和解吸实验在Cs浓度为1 × 104、1 × 105和2 × 109摩尔L1，pH为5.5时进行。使用0.1摩尔L1 LiCl，NaCl，KCl，RbCl和CsCl溶液的Cs从矿物的解吸进行了检查。使用0.1摩尔L1 LiCl溶液、1摩尔L1 KCl溶液和1摩尔L1 HCl溶液检查顺序解吸。在Cs浓度为109摩尔L1时，矿物的分配系数（Kd）的顺序为丝光沸石>伊利石>蒙脱石、绢云母、MnO 2、高岭石和埃洛石> Al 2 O3、TiO 2、Al 2 O3和FeOOH，与Cs浓度较高时的顺序不同。在通过三种试剂溶液的顺序解吸之后，Cs的残留分数在Cs浓度109摩尔L1处比在更高浓度处更高。吸附态铯的40%、40%、50%和25%分别残留在蒙脱石、丝光沸石、MnO 2和高岭石中。这些结果有力地表明：（1）109摩尔L1的放射性Cs与非云母矿物的联系比1 × 104和1 × 105摩尔L1的高浓度更强;（2）非云母矿物蒙脱石、丝光沸石、高岭石和MnO 2有助于放射性Cs沉降物在福岛土壤上的固定。
We studied the adsorption behavior of radioactive cesium (Cs) by the non-mica minerals kaolinite, halloysite, chlorite, montmorillonite, mordenite, MnO2, TiO2, Al2O3, and FeOOH to elucidate the environmental behavior of radioactive Cs fallout from the Fukushima Daiichi Nuclear Power Plant in the Tohoku region of Japan. The adsorption and desorption experiments of Cs on the minerals were carried out at the Cs concentrations 1 x 104, 1 x 105, and 2 x 109 mole L1 at pH 5.5. The desorption of Cs from the minerals was examined using 0.1 mole L1 LiCl, NaCl, KCl, RbCl, and CsCl solutions. The sequential desorption was examined using a 0.1 mole L1 LiCl solution, a 1 mole L1 KCl solution, and a 1 mole L1 HCl solution. The distribution coefficient (K d) for the minerals at the Cs concentration 109 mole L1 was in the order of mordenite > illite > montmorillonite, sericite, MnO2, kaolinite, and halloysite > chlorite, TiO2, Al2O3, and FeOOH, differing from the order observed at higher Cs concentrations. After the sequential desorption by the three reagent solutions, the residual fraction of Cs was higher at the Cs concentration 109 mole L1 than at higher concentrations. Approximately 40%, 40%, 50%, and 25% of the adsorbed Cs were residual in montmorillonite, mordenite, MnO2, and kaolinite, respectively, after the sequential desorption. These results strongly suggest that (1) radioactive Cs at 109 mole L1 is more strongly associated with the non-mica minerals than at higher concentrations of 1 x 104 and 1 x 105 mole L1, and (2) the non-mica minerals montmorillonite, mordenite, kaolinite, and MnO2 contributed to the fixation of the radioactive Cs fallout on Fukushima soil.