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Large-area self-standing thin film of porous hydrogen-bonded organic framework for efficient uranium extraction from seawater
Chem ( IF 19.1 ) Pub Date : 2022-08-10 , DOI: 10.1016/j.chempr.2022.07.009
Ashwini Kaushik , Karan Marvaniya , Yamini Kulkarni , Dhruv Bhatt , Jahanvi Bhatt , Manoj Mane , E. Suresh , Srinu Tothadi , Ketan Patel , Shilpi Kushwaha

Uranium extraction from seawater (UES) efficiency is limited by the material design, such as U-selective binding sites, their uniform distribution, surface area exposure, diffusivity, and stability. Herein, we report a U-selective single-component hydrogen-bonded organic framework (CSMCRIHOF-1) of phenoxy-imine synthons conjugated to pyridyl tectons with varied pore dimensions of ∼3.6—∼3.8 Å, resulting in flow-through channels and 328 m2/g BET surface area. The CSMCRIHOF-1 shows a 3D robust network of hydrogen bonds (O−H···O, C−H···O, and O−H···N) supported by π-π stacking, exhibiting excellent hydrolytic stability under broad pH range (pH 1–10). Relative to other framework materials, the CSMCRIHOF-1 is easily processable and regenerable. Further processing of CSMCRIHOF-1 yields large-area free-standing thin films (TFCHs) of tunable thickness from 40 to 500 nm with enhanced surface area (550 m2/g). TFCH shows significant UES capacities of ∼11 mg/g within 5 days and 17.9 mg/g in 30 days from natural seawater.



中文翻译:

用于从海水中高效提取铀的大面积自立式多孔氢键有机骨架薄膜

从海水中提取铀 (UES) 的效率受到材料设计的限制,例如 U 选择性结合位点、它们的均匀分布、表面积暴露、扩散性和稳定性。在这里,我们报告了一种 U 选择性单组分氢键有机骨架 ( CSMCRI HOF-1),它由苯氧亚胺合成子与不同孔径为 ∼3.6-∼3.8 Å 的吡啶基结构共轭,从而形成流通通道和328 m 2 /g BET 表面积。CSMCRI HOF-1 显示出由 π-π 堆叠支持的 3D 稳健的氢键网络(O-H···O、C-H···O 和 O-H···N),表现出优异的水解稳定性在较宽的 pH 范围(pH 1-10)下。相对于其他框架材料,CSMCRIHOF-1 易于加工和再生。CSMCRI HOF-1的进一步加工产生大面积的自支撑薄膜 (TFCH),其厚度从 40 到 500 nm 可调,具有增强的表面积 (550 m 2 /g)。TFCH 在 5 天内显示出显着的 UES 容量,在 5 天内达到 11 mg/g,在 30 天内从天然海水中达到 17.9 mg/g。

更新日期:2022-08-10
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