Selective extraction of thorium from uranium and rare earth elements using sulfonated covalent organic framework and its membrane derivate
Selective extraction of thorium from uranium and rare earth elements using sulfonated covalent organic framework and its membrane derivate
复制标题
磺化共价有机骨架及其膜衍生物从铀和稀土元素中选择性萃取钍
DOI：
10.1016/j.cej.2019.123240
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发表时间：
2020
影响因子：
15.1
通讯作者：
Luo Feng
中科院分区：
文献类型：
--
作者：
Xiong Xiao Hong;Tao Yuan;Yu Zhi Wu;Yang Li Xiao;Sun Li Jun;Fan Ya Lin;Luo Feng
Thorium, as a nuclear-power replacement for the uranium-based nuclear reactors and an effective avenue to produce uranium source, has become a key element for the increasing energy demand. However, we now are seriously restricted to gain thorium from mineral, due to co-existence of thorium, uranium, and rare earth elements. Accordingly, there is an urgent need to develop solid extraction technique with both large thorium adsorption capacity and high adsorption selectivity. In this work, a COF (covalent organic framework) adsorbent, namely [NH4]+[COF-SO3−] was prepared for selective extraction of thorium from uranium, and rare earth elements. The selective adsorption towards Th(IV) is reflected on the large distribution coefficient (Kd) of 1.34 × 105mL/g, the big difference up to two orders of magnitude in the adsorption capacity, and the high selectivity (more than nine). This ultrahigh Th(IV) capture up to 395 mg/g presents the largest value for Th(IV) adsorption by porous absorbents. Furthermore, the practical separation of Th(IV) from U(VI) and rare earth elements (Eu3+and Ce3+) was for the first time executed by both the breakthrough experiment and membrane-based separation experiment. Most importantly, upon this breakthrough separation a Th(VI) solution with high purity up to 93.5% was obtained.
