High-performance porous anion exchange membranes for efficient acid recovery from acidic wastewater by diffusion dialysis
High-performance porous anion exchange membranes for efficient acid recovery from acidic wastewater by diffusion dialysis
复制标题
高性能多孔阴离子交换膜，用于通过扩散渗析从酸性废水中高效回收酸
DOI：
10.1016/j.memsci.2021.119116
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发表时间：
2021-02-03
影响因子：
9.5
通讯作者：
Zhao, Shuaifei
中科院分区：
文献类型：
--
作者：
Lin, Jiuyang;Huang, Junming;Zhao, Shuaifei
在可持续发展概念框架中，高酸性废水被视为宝贵的资源，而不是废物。采用阴离子交换膜的扩散渗析是从该废液中提取酸的可行解决方案。然而，传统的阴离子交换膜具有致密的空间结构，即使在纳米级也没有可观察到的孔，这限制了质子的转移。多孔阴离子交换膜以其独特的空间结构为质子传递提供了一条实用的途径。本研究以多孔溴化聚苯醚膜为基材，通过1，4-二氮杂双环[2. 2. 2]辛烷的一步交联和季铵化反应，设计了新型多孔阴离子交换膜。所得多孔阴离子交换膜具有独特的微结构，包括极薄的选择性层和高的自由空间体积，因此在扩散透析法回收酸方面表现出高性能。具体而言，最佳阴离子交换膜在HCl/FeCl 2混合溶液中具有0.066 +/- 0.003 m h（-1）的酸渗析系数和96.9 +/- 2.5的酸/盐分离因子，优于商业阴离子交换膜（即，DF-120，酸渗析系数0.0085 m·h（-1），酸盐分离因子18.5）。这项研究表明，在大规模构建先进的阴离子交换膜，从高酸性废水中有效地回收酸，以支持环境的可持续性的巨大潜力。
In the sustainability concept framework, wastewater highly loaded with acid is considered as a valuable resource, rather than a waste. Diffusion dialysis employing anion exchange membranes is a feasible solution to extracting acid from this waste stream. However, conventional anion exchange membranes have dense spatial structures with no observable pores even at nanoscale, which limits the transfer of protons. Porous anion exchange membranes provide a practical avenue to enhance the proton transfer due to their unique spatial structure. In this study, novel porous anion exchange membranes were designed by one-step crosslinking and quaternization of porous brominated poly (phenylene oxide) membrane substrate by 1, 4-diazabicyclo [2.2.2] octane. The resultant porous anion exchange membranes showed a high performance in acid recovery by diffusion dialysis, due to their uniquely tailored microstructures including an extremely thin selective layer and high free space volume. Specifically, the optimal anion exchange membrane possessed an acid dialysis coefficient of 0.066 +/- 0.003 m h(-1) and an acid/salt separation factor of 96.9 +/- 2.5 in the HCl/FeCl2 mixture solution, outperforming the commercial anion exchange membrane (i.e., DF-120, acid dialysis coefficient of 0.0085 m h(-1) and acid/salt separation factor of 18.5). This study demonstrates the great potential in constructing advanced anion exchange membranes at large scale for efficient acid recovery from highly acidic wastewater to support environment sustainability.