A high-capacity amidoxime-functionalized magnetic composite for selective uranium capture in Salt Lake water
A high-capacity amidoxime-functionalized magnetic composite for selective uranium capture in Salt Lake water
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用于选择性捕获盐湖水中铀的高容量偕胺肟功能化磁性复合材料
DOI：
10.1016/j.jece.2021.106688
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发表时间：
2021-10
影响因子：
7.7
通讯作者：
Zunli Mo
中科院分区：
文献类型：
--
作者：
Nijuan Liu;Cuicui Li;Jing Bai;Hao Liang;Qinqin Gao;Nana Wang;Ruibin Guo;Zhi Qin;Zunli Mo
为了促进核能的可持续发展和利用，必须开发方便、高效的铀浓缩方法。本文采用简单的两步法合成了偕胺肟功能化磁性复合材料cs - py- fe3o4 - ao，并将其用于天然盐湖水中铀的选择性吸附。首先通过批量实验考察了cs - py- fe3o4 - ao在pH、接触时间、温度、离子强度和干扰离子等不同条件下对铀吸附能力的影响。结果表明，在pH= 6、T = 298 K条件下，该吸附材料的最大吸附容量为937.14 mg/g，高于目前报道的大多数磁性吸附剂。吸附-解吸循环5次后，吸附剂易于再生，仍能保持较高的吸附容量。同时，利用FT-IR和XPS研究了cs - py- fe3o4 - ao对铀的吸附机理，结果表明，氮氧官能团（如偕胺肟和氨基）对铀的吸附起主导作用。此外，cs - py- fe3o4 - ao对盐湖水体中的铀具有良好的选择性和吸附能力（3.75 mg/g），表明cs - py- fe3o4 - ao具有作为铀浓缩吸附剂的潜力。
In order to promote the sustainable development and utilization of nuclear energy, it is essential to develop convenient and efficient methods for uranium enrichment. In this work, an amidoxime functionalized magnetic composite (CS-Ppy-Fe3O4-AO) was synthesized by a simple two-step process and applied for selective adsorption of uranium from natural Salt Lake water. The effect of CS-Ppy-Fe3O4-AO on the uranium adsorption capacity under different conditions such as pH, contact time, temperature, ionic strength and interfering ions were firstly investigated by batch experiments. The results indicated that the maximum adsorption capacity was 937.14 mg/g at pH= 6 and T = 298 K, which was higher than that of most currently reported magnetic adsorbents. Moreover, the adsorbent could be easily regenerated and still maintained high adsorption capacity after five adsorption-desorption cycles. Meanwhile, the adsorption mechanism of CS-Ppy-Fe3O4-AO on uranium was investigated by FT-IR and XPS, and they showed that nitrogen-oxygen functional groups (e.g. amidoxime and amino groups) played a predominant role on the adsorption of uranium. What’ s more, the CS-Ppy-Fe3O4-AO showed excellent selectivity and adsorption capacity (3.75 mg/g) on uranium in Salt Lake water, which implied that the CS-Ppy-Fe3O4-AO could be potentially used as a desired adsorbent on uranium enrichment.
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