Recovery of cesium ions from seawater using a porous silica-based ionic liquid impregnated adsorbent
Recovery of cesium ions from seawater using a porous silica-based ionic liquid impregnated adsorbent
复制标题
DOI：
10.1016/j.net.2021.10.026
复制
发表时间：
2021-10
影响因子：
2.7
通讯作者：
Hao Wu;T. Kudo;Seongyun Kim;M. Miwa;S. Matsuyama
中科院分区：
文献类型：
--
作者：
Hao Wu;T. Kudo;Seongyun Kim;M. Miwa;S. Matsuyama
通过用萃取剂1，3-[（2，4-二乙基庚基乙氧基）氧基]-2，4-冠-6-杯[4]芳烃（杯[4]芳烃-R14）和添加剂1-乙基-3-甲基咪唑鎓双（三氟甲基磺酰基）酰亚胺（C2mim+ NTf 2 −）作为材料浸渍二氧化硅载体的孔来制备多孔二氧化硅基吸附剂，以从海水中去除铯（I）（Cs+）离子。该吸附剂对Cs+离子具有良好的吸附性能，在2 h内达到吸附平衡，吸附量为0.196 mmol/g。溶液的pH值，温度和共存的金属离子的存在下，被发现几乎没有影响Cs+吸附。吸附机理被认为是通过Cs+和C2mim+之间的离子交换进行的。此外，粒子诱导X射线发射分析结果进一步阐明，吸附剂上的Cs+离子物种是在CsCl和CsBr的形式。
A porous silica-based adsorbent was prepared by impregnating the pores of a silica support with the extractant 1,3-[(2,4-diethylheptylethoxy)oxy]-2,4-crown-6-calix[4]arene (Calix[4]arene-R14) and an additive agent 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (C2mim+NTf2−) as the materials to remove cesium(I) (Cs+) ions from seawater. The as-prepared adsorbent showed excellent adsorption performance toward Cs+ions, with adsorption equilibrium reached within 2 h and an adsorption amount of 0.196 mmol/g observed. The solution pH, temperature, and the presence of coexisting metal ions were found to have almost no effect on Cs+adsorption. The adsorption mechanism was considered to proceed via ion exchange between Cs+and C2mim+. In addition, the particle-induced X-ray emission analysis results further clarified that the adsorbed Cs+ion species on the adsorbent was in the form of both CsCl and CsBr.