Porous Anion Exchange Membrane for Effective Acid Recovery by Diffusion Dialysis
Porous Anion Exchange Membrane for Effective Acid Recovery by Diffusion Dialysis
复制标题
多孔阴离子交换膜可通过扩散透析有效回收酸
DOI：
10.3390/pr9061049
复制
发表时间：
2021-06-01
期刊：
影响因子：
3.5
通讯作者：
Lin, Xiaocheng
中科院分区：
文献类型：
--
作者：
Yang, Jinbei;Dai, Guangkai;Lin, Xiaocheng
采用阴离子交换膜 (AEM) 的扩散透析 (DD) 为从酸性废水中回收酸提供了诱人的机会。然而，由于 AEM 的酸透析系数 (Uacid) 较低，因此制造高酸渗透性 AEM 存在挑战。本文报道了一系列基于氯甲基聚醚砜（CMPES）多孔膜基材并经过交联和季铵化处理而制备的多孔且高酸渗透性AEM。这种多孔 AEM 由于自由体积大以及相对于致密 AEM 显着降低的离子传输阻力而表现出高 U 酸。与商用致密DF-120 AEM相比，我们的最佳多孔AEM在相同条件下应用于酸回收时，U酸同时高出466.7%，酸/盐分离因子（Sacid/salt）高出75.7%。此外，考虑到简单高效的制造工艺以及低成本，我们的膜在工业酸性废水中酸回收的实际应用中显示出巨大的前景。
Diffusion dialysis (DD) employing anion exchange membranes (AEMs) presents an attractive opportunity for acid recovery from acidic wastewater. However, challenges exist to make highly acid permeable AEMs due to their low acid dialysis coefficient (Uacid). Here, a series of porous and highly acid permeable AEMs fabricated based on chloromethyl polyethersulfone (CMPES) porous membrane substrate with crosslinking and quaternization treatments is reported. Such porous AEMs show high Uacid because of the large free volume as well as the significantly reduced ion transport resistance relative to the dense AEMs. Compared with the commercial dense DF-120 AEM, our optimal porous AEM show simultaneous 466.7% higher Uacid and 75.7% higher acid/salt separation factor (Sacid/salt) when applied to acid recovery at the same condition. Further, considering the simple and efficient fabrication process as well as the low cost, our membranes show great prospects for practical acid recovery from industrial acidic wastewater.