Abstract
Covalent organic frameworks (COFs) have broad application prospects in adsorption and separation. Yet, as COFs are generally in powder form, their superior performance at the laboratory scale is difficult to transfer into pilot- or industrial-scale use. Thus, there is a strong and urgent need to structure COFs into monolithic materials. Herein, a facile strategy was developed to prepare COFs@alginate composite beads. Three composite beads comprising different COFs including TpPa-1 (2,4,6-triformylphloroglucinol (Tp) and p-phenylenediamine (Pa-1) as monomers), TpDb (Tp and 2,5-diaminobenzonitrile (Db) as monomers) and TpTt (Tp and 1,3,5-triazine-2,4,6-triamine (Tt) as monomers) with controlled COF loading and product size have been facilely achieved via this strategy, validating the applicability of this method. Furthermore, the representative TpDb@alginate composite beads showed good adsorption performance of uranium(VI) in aqueous solution with high adsorption capacity (635 mg·g−1), good interference immunity and recyclability. This work offers a practical approach for incorporation of COFs into polymer matrix, which can serve as potential adsorbents for radioactive wastewater treatment.
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摘要
共价有机骨架(COFs)在吸附分离方面具有广阔的应用前景。然而, 常规合成的COFs通常是粉末状的, 它们在实验室规模上的优异性能很难转化为工业规模的使用。因此, 急需将COFs制备成整体材料。本文开发了一种简便的COFs@海藻酸复合微珠的制备方法。 通过这种策略, 可以容易地获得三种不同COFs的复合微珠, 包括TpPa-1(2,4,6-三甲酰基间苯三酚(Tp)和对苯二胺(Pa-1)作为单体), TpDb(Tp和2,5-二氨基苯腈(Db)作为单体)和TpTt(Tp和1,3,5-三嗪-2,4,6-三胺(Tt)作为单体), 而且微珠的尺寸和COFs的含量是可以调控的。此外, TpDb@海藻酸盐复合微珠对水溶液中的铀表现出良好的吸附性能, 吸附容量高达635 mg·g-1, 且具有很强的抗干扰能力以及可回收利用性。本工作为制备COFs与聚合物复合吸附剂材料提供了一条切实可行的途径。
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Acknowledgements
This study was financially supported by the Natural Science Foundation of Hainan Province (No. 2019RC005), the National Natural Science Foundation of China (Nos. 22061014 and 21761010) and Hainan University Start-Up Fund (No. KYQD(ZR)1806).
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Duan, P., Lin, DY., Yang, WT. et al. Facile preparation of covalent organic frameworks@alginate composite beads for enhanced uranium(VI) adsorption. Rare Met. 41, 1323–1331 (2022). https://doi.org/10.1007/s12598-021-01884-0
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DOI: https://doi.org/10.1007/s12598-021-01884-0