Facile preparation of Ce enhanced vinyl-functionalized silica aerogel-like monoliths for selective separation of radioactive thorium from monazite
Facile preparation of Ce enhanced vinyl-functionalized silica aerogel-like monoliths for selective separation of radioactive thorium from monazite
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DOI：
10.1016/j.matdes.2019.108333
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发表时间：
2020-01
影响因子：
8.4
通讯作者：
Hao Zhang;Fan Yang;Ruixi Bai;Zhigang Zhao;Chunqing Cai;Jianguo Li;Ying Ma
中科院分区：
文献类型：
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作者：
Hao Zhang;Fan Yang;Ruixi Bai;Zhigang Zhao;Chunqing Cai;Jianguo Li;Ying Ma
钍 (Th) 是一种稀土金属伴生矿石，具有放射性，对环境有害，但它也是铀的潜在核燃料替代品。稀土元素Th的分离对于环境治理和清洁能源发展具有重要意义。在这项工作中，采用低消耗、快速的技术合成了一种具有柔性的整体式铈（Ce）掺杂类二氧化硅气凝胶，并将其用于连续固相萃取中作为选择性分离Th/REE的吸附剂。批量吸附实验表明，当金属离子含量异常高（20ppm）时，Th(IV)的吸附效率可达96%。在相同条件下，REEs的吸附效率接近于零，这表明类气凝胶对Th/REEs具有良好的选择性分离作用。结果还表明，Th(IV)可以在弱酸性介质中从吸附剂上解吸，对环境友好。因此，该材料在Th/REEs的分离以及环境中放射性污染的去除方面具有应用前景。
Thorium (Th) is an associated ore of rare earth metals that is radioactive and harmful to the environment, but it is also a potential nuclear fuel replacement for uranium. The separation of Th from rare earth elements (REEs) is of great importance in environmental governance and clean-energy development. In this work, a monolithic cerium (Ce) doped silica aerogel-like with flexibility was synthesized using a low consumption and rapid technique, and it was used in a continuous solid-phase extraction as an adsorbent for the selective separation of Th/REEs. The batch adsorption experiments showed that the adsorption efficiency of Th(IV) can be up to 96% when abnormally high levels of metal ions (20 ppm) exist. Under the same conditions, the adsorption efficiency of REEs is at a near-zero level, which demonstrates the great selective separation of Th/REEs for the aerogel-like. The results also indicated that Th(IV) could desorb from the adsorbent in weak acidic media, which is friendly to the environment. Therefore, the material has application prospects for the separation of Th/REEs and removal of radioactive contamination from the environment.