In this study, a series of novel anion exchange membranes composed of polyvinyl alcohol (PVA) and various amount of synthesized anion exchange precursor were successfully prepared and used for acid recovery by DD process. The anion exchange precursor (Q-DAN) was synthesized through reaction of 1,5-diaminonaphthalene (DAN) and 2,3-epoxypropyltrimethylammonium chloride (EPTC) which was confirmed by proton NMR. The dosage of Q-DAN inside membrane matrix played an important role to determine the electrochemical and physicochemical properties of Q-DAN AEMs. Influences of Q-DAN and multivalent metal ions on acid recovery were elaborated in detail. Acid dialysis coefficients (U_H) values for FeCl₂-HCl system were in the range of 0.0194–0.0295 m/h and separation factors were ranged from 27.84 to 52.60 at 25 °C. Furthermore, acid dialysis coefficient (3.28 times) and separation factor (2.84 times) were much greater than commercial membrane DF-120 (U_H and S = 0.009 m/h and 18.5), respectively. Moreover, Q-DAN-4 membrane was selected to investigate the effects of multivalent metal ions on diffusion dialysis. The results showed that the presence of different metal salts in hydrochloric acid solution effect the membrane diffusivity and selectivity in diffusion dialysis process due to complexation of metal ions and acid.

在这项研究中，成功​​地制备了一系列由聚乙烯醇（PVA）和各种合成的阴离子交换前体组成的新型阴离子交换膜，并将其用于DD法回收酸。通过1，5-二氨基萘（DAN）和2，3-环氧丙基三甲基氯化铵（EPTC）的反应合成了阴离子交换前体（Q-DAN），该反应通过质子NMR证实。膜基质内部Q-DAN的用量在确定Q-DAN AEM的电化学和物理化学性质方面起着重要作用。详细阐述了Q-DAN和多价金属离子对酸回收的影响。FeCl _2的酸透析系数（U _H）值-HCl系统的温度范围为0.0194-0.0295 m / h，在25°C时分离系数为27.84至52.60。此外，酸渗析系数（3.28倍）和分离系数（2.84倍）分别比商品膜DF-120大（U _H和S = 0.009 m / h和18.5）。此外，选择Q-DAN-4膜来研究多价金属离子对扩散渗析的影响。结果表明，由于金属离子与酸的络合作用，盐酸溶液中不同金属盐的存在影响了膜的扩散性和选择性。