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Covalent Organic Framework Membrane with Turing Structures for Deacidification of Highly Acidic Solutions
Advanced Functional Materials ( IF 19.0 ) Pub Date : 2021-11-21 , DOI: 10.1002/adfm.202108178
Lihong Zhou 1 , Xiaofeng Li 2 , Kecheng Cao 3 , Zhimin Jia 2 , Honghan Long 2 , Yang Li 2 , Guohong Tao 2 , Ning Liu 4 , Jie Zhang 1 , Lijian Ma 2
Affiliation  

The deacidification of highly acidic industrial wastewater, such as the spent fuel reprocessing feed liquid, is of great significance for the smooth progress of the subsequent treatment processes. Herein, a novel covalent organic framework (COF) membrane with bidirectional anisotropic Turing structures is synthesized for the first time and used for deacidification. The COF membrane presents linear and hydrophobic properties on one side and porous and superhydrophilic properties on the other side, which makes the water permeability of hydrophilic side 45 times higher than that of the hydrophobic side and effectively prevents the reverse osmosis of water. Impressively, the COF membrane has excellent thermal, acid, and irradiation stabilities, and an extraordinarily high ability to intercept metal ions in a complex multi-ion solution containing 5 m HNO3, with the interception rate up to 100%. However, H+ can easily pass through the membrane with the permeation flux of 1015.7 mol L−1 m−2, which realizes the efficient deacidification of high acidic solutions. This study provides not only a new idea for the design and preparation of Turing-structural membranes, but also a feasible strategy for the deacidification and process simplification of spent fuel reprocessing feed liquid and other industrial wastewater with high acidity.

中文翻译:

具有图灵结构的共价有机骨架膜用于强酸性溶液的脱酸

乏燃料后处理料液等高酸性工业废水的脱酸对后续处理工艺的顺利进行具有重要意义。在此,首次合成了一种具有双向各向异性图灵结构的新型共价有机框架(COF)膜并用于脱酸。COF膜一方面呈现线性和疏水性,另一方面呈现多孔和超亲水性,使得亲水侧的透水性比疏水侧高45倍,有效防止水的反渗透。令人印象深刻的是,COF 膜具有出色的热稳定性、酸稳定性和辐照稳定性,并且在含有 5m HNO 3,截留率高达100%。而H +可以轻松通过膜,渗透通量为1015.7 mol L -1 m -2,实现了高酸性溶液的高效脱酸。该研究不仅为图灵结构膜的设计和制备提供了新思路,也为乏燃料后处理料液等高酸度工业废水的脱酸和工艺简化提供了可行的策略。
更新日期:2021-11-21
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