Enrichment of uranium in seawater by glycine cross-linked graphene oxide membrane
Enrichment of uranium in seawater by glycine cross-linked graphene oxide membrane
复制标题
甘氨酸交联氧化石墨烯膜富集海水中的铀
DOI：
10.1016/j.cej.2022.136602
复制
发表时间：
2022
影响因子：
15.1
通讯作者：
Jing Bai
中科院分区：
文献类型：
--
作者：
Jian Chu;Qinggang Huang;Yuhua Dong;Zeen Yao;Jieru Wang;Zhi Qin;Zhigang Ning;Jianjun Xie;Wei Tian;Huijun Yao;Jing Bai
从海水中提取铀可以满足可持续核能发电领域对铀的需求。然而，由于海水中铀的浓度极低，采用传统方法直接提取海水中的铀存在许多困难，而且效率低下。基于铀与主要共存离子（K+、Na+、Ca2+和Mg2+）水化直径的差异，认为膜分离技术是一种有效的海水铀富集方法。本文制备了一种新型甘氨酸（Gly）交联氧化石墨烯（GO-Gly）膜，其层间距(d)非常稳定，通道尺寸均匀，满足铀浓缩的要求。铀和海水中主要共存离子的单离子截除性能表明，GO-Gly膜对铀的截除率为~ 100%。此外，在模拟海水连续过滤过程中，该膜仍能保持优异的除铀性能，只有铀离子明显富集，但主要共存离子的浓度基本保持不变。GO-Gly膜对铀离子的吸附和富集特性使其成为海水中铀富集的理想候选膜。
Extraction of uranium from seawater can satisfy the request for uranium in the field of sustainable nuclear power generation. However, direct extraction of uranium from seawater with traditional methods encounters many difficulties with reduced efficiency because of the extremely low uranium concentration. Based on the hydration diameter difference between uranium and the main coexisting ions (K+, Na+, Ca2+and Mg2+), membrane separation technology is thought as an effective way to enrich uranium in seawater. Here, a new type of glycine (Gly) cross-linked graphene oxide (GO-Gly) membrane was fabricated, whose interlayer spacing (d) is very stable with uniform channel size satisfied the requirement for uranium enrichment. The respectively single ion rejection properties of uranium and the main coexisting ions in seawater revealed that ∼ 100% of uranium was rejected by the GO-Gly membrane. In addition, the excellent uranium rejection property of this membrane can be maintained in continuously filtrating the simulated seawater, only uranium ion was obviously enriched but the concentrations of the main coexisting ions kept nearly constant. The distinct rejection and enrichment properties of uranium ions by GO-Gly membrane made it an ideal candidate for uranium enrichment in seawater.