REMOVAL OF CESIUM IONS FROM RADIOACTIVELY CONTAMINATED SOILS USING MICROWAVE TREATMENT
REMOVAL OF CESIUM IONS FROM RADIOACTIVELY CONTAMINATED SOILS USING MICROWAVE TREATMENT
复制标题
使用微波处理去除放射性污染土壤中的铯离子
DOI：
10.11362/jcssjclayscience.ms-21-2
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
H. Sato
中科院分区：
文献类型：
--
作者：
K. Tamura;H. Yamashita;T. Kogure;M. Morita;A. Yamagishi;H. Sato
在福岛（日本）取样的放射性污染土壤经过微波处理，以去除铯离子。将含有5.0 g土壤（7.2× 105 Bq/kg）和三种化学试剂之一的水性悬浮液（20 mL）密封在Teflon容器（4.0 cm内径× 5.0 cm）中。检查以下三种试剂的作用：3.0 M Mg（NO3）2、6.5 M NH 4F/HF和1.5 MH 2SO 4。用800 W的微波照射容器3 min。将容器冷却至室温后，取出内容物并离心，测定固体沉淀物的放射性。使用ICP-MS测定滤液的元素组成。记录处理前后固体沉淀物的XRD图案。结果表明：（i）在3.0M Mg（NO3）2对放射性Cs+离子的浸出实验中，微波辐射3 min后，85%的137 Cs+离子被解吸，表明微波处理放射性污染土壤的有效性;（ii）放射性Cs+离子的解吸率低于5%。（iii）用6.5M NH_4F/HF通过溶解二氧化硅有效地消除了90%以上的~（137）Cs+离子;（iv）约70%的137 Cs+离子通过氧化铝的溶解用1.5MH_2SO_4消除。这些结果表明，土壤中的137 Cs+离子被牢固地固定在粘土矿物（可能是风化的黑云母），只有当它们的吸附结构被破坏时才能被去除。
Radioactively contaminated soils sampled at Fukushima (Japan) underwent microwave treatment to remove cesium ions. An aqueous suspension (20 mL) containing 5.0 g of the soil (7.2× 105 Bq/kg) and one of three chemical reagents was sealed in a Teflon vessel (4.0 cm id× 5.0 cm). The effects of the following three reagents were examined: 3.0 M Mg (NO3) 2, 6.5 M NH4F/HF, and 1.5 MH2so4. The vessel was irradiated with microwaves at 800 W for 3 min. After the vessel was cooled to room temperature, the contents were removed and centrifuged, and the radioactivity of the solid precipitate was measured. The elemental composition of the filtrate was determined using ICP-MS. The XRD patterns of the solid precipitates were recorded before and after the treatment. Results indicated that:(i) in the radioactive Cs+ ions leaching experiment with 3.0 M Mg (NO3) 2 from a reference saponite, 85% 137Cs+ ions were desorbed after 3 min of microwave irradiation, indicating the effectiveness of the microwave treatment for radioactively contaminated soils,(ii) less than 5% of the radioactive Cs+(or 137Cs+) ions were eliminated through ion-exchange with 3.0 M Mg (NO3) 2;(iii) more than 90% of the 137Cs+ ions were effectively eliminated with 6.5 M NH4F/HF via dissolution of silica;(iv) approximately 70% of the 137Cs+ ions were eliminated with 1.5 MH2so4 via dissolution of alumina. These results demonstrated that 137Cs+ ions in the soil were fixed firmly in clay minerals (possibly weathered biotite) and could be removed only when their adsorbing structures were disrupted.
DOI：
10.1073/pnas.1112058108
发表时间：
2011-12-06
影响因子：
11.1
作者：
Yasunari, Teppei J.;Stohl, Andreas;Yasunari, Tetsuzo
通讯作者：
Yasunari, Tetsuzo