Guanidinium-based ionic covalent organic frameworks for capture of uranyl tricarbonate,Advanced Composites and Hybrid Materials

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Guanidinium-based ionic covalent organic frameworks for capture of uranyl tricarbonate
Advanced Composites and Hybrid Materials ( IF 23.2 ) Pub Date : 2021-07-28 , DOI: 10.1007/s42114-021-00311-3
Ying Liang ₁ , Meng Xia ₁ , Qiuhan Yu ₁ , Yihui Yuan ₁ , Qi Chen ₁ , Ning Wang ₁ , Yongpeng Li ₂ , Zhuyin Sui ₂ , Xin-Ming Hu ₃

Affiliation

Uranium, which was abundant in the ocean but existed in the form of uranyl tricarbonate ([UO₂(CO₃)₃]⁴⁻) with an extremely low concentration of 3.3 ppb, was a significant element of nuclear energy. It is of immediate significance to the research into uranium extraction by the exploration of adsorbents for environment and resource sustainability. Herein, the new ionic covalent organic frameworks (iCOFs) named COF-DG containing the guanidine groups was designed and synthesized via Schiff base reaction between diaminoguanidine hydrochloride and 1,3,5-triformylphloroglucinol. The adsorption performance indicated that the COF-DG possessed an uptake capacity of 65.6 mg g⁻¹ toward the [UO₂(CO₃)₃]⁴⁻, attributed to the chemical interaction and anion exchange between [UO₂(CO₃)₃]⁴⁻ and the cationic COF-DG with Cl⁻, as well as the electrostatic attraction. Besides, the COF-DG exhibited a higher affinity and selectivity toward [UO₂(CO₃)₃]⁴⁻ in the presence of the competing anions. Furthermore, the COF-DG displayed an antibacterial rate of 82% against Gram-negative bacteria Escherichia coli owing to the guanidine groups. This work contributes new insights into the further development of iCOFs, for applying as a potential candidate in uranium extraction from seawater in practical engineering.

Graphical abstract

The new ionic covalent organic frameworks named COF-DG was designed and exploited via Schiff base reaction, which exhibited a higher affinity and selectivity toward the [UO₂(CO₃)₃]⁴⁻.

中文翻译：

用于捕获三碳酸铀酰的胍基离子共价有机骨架

铀在海洋中含量丰富，但以三碳酸铀酰（[UO ₂ (CO ₃ ) ₃ ] ⁴⁻）的形式存在，浓度极低，仅为 3.3 ppb，是核能的重要元素。通过探索吸附剂对环境和资源可持续性的研究，对铀提取的研究具有直接意义。在此，通过二氨基胍盐酸盐和 1,3,5-三甲酰基间苯三酚之间的席夫碱反应，设计并合成了新型离子共价有机骨架 (iCOFs)，名为 COF-DG，含有胍基团。吸附性能表明，该COF-DG具有65.6毫克g的吸收容量^-1朝向[UO ₂(CO ₃ ) ₃ ] ^4-，归因于[UO ₂ (CO ₃ ) ₃ ] ^4-和带有Cl ^-的阳离子COF-DG之间的化学相互作用和阴离子交换，以及静电引力。此外，在竞争阴离子的存在下，COF-DG对[UO ₂ (CO ₃ ) ₃ ] ^4-表现出更高的亲和力和选择性。此外，COF-DG 对革兰氏阴性菌大肠杆菌的抗菌率为 82%由于胍基。这项工作为 iCOF 的进一步发展提供了新的见解，可作为从海水中提取铀在实际工程中的潜在候选者。