Large-area self-standing thin film of porous hydrogen-bonded organic framework for efficient uranium extraction from seawater

Abstract
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.

Citation
Kaushik, A., Marvaniya, K., Kulkarni, Y., Bhatt, D., Bhatt, J., Mane, M., Suresh, E., Tothadi, S., Patel, K., & Kushwaha, S. (2022). Large-area self-standing thin film of porous hydrogen-bonded organic framework for efficient uranium extraction from seawater. Chem. https://doi.org/10.1016/j.chempr.2022.07.009

Acknowledgements
Authors are thankful to Dr. Prashant Kumar and Dr. Goudappagouda Patil for their valuable scientific suggestions. The authors are grateful to the Council of Scientific and Industrial Research, India, for the financial support (A.K. CSIR/JRF/31/028(0272)/2019-EMR-1; K.P. CSIR-CSMCRI/MLP0043; and S.K. HRDG/YSA-2021/05/17(53)22 and CSIR-CSMCRI/MLP0045). S.T. thanks CSIR-HRDG for award of senior research associateship under scientist pools scheme (Pool No. 9119-A). The authors also acknowledge the analytical support from the CSIR-CSMCRI, Bhavnagar. A PRIS number (CSIR-CSMCRI–118/2021) has been assigned for this manuscript.

Publisher
Elsevier BV

Journal
Chem

DOI
10.1016/j.chempr.2022.07.009

Additional Links
https://linkinghub.elsevier.com/retrieve/pii/S2451929422003680

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