Semi-interpenetrating Polymer-Network Anion Exchange Membrane Based on Quaternized Polyepichlorohydrin and Polyvinyl Alcohol for Acid Recovery by Diffusion Dialysis

Abstract

In this paper, polyepichlorohydrin (PECH) quaternized with Nmethylimidazole (ImPECH) was successfully synthesized. ImPECH, polyvinyl alcohol, and tetraethyl orthosilicate were used to prepare anion exchange membranes that possessed a semi-interpenetrating polymer-network structure. These membranes were designed for acid recovery by diffusion dialysis (DD). The successful synthesis of ImPECH was verified via Fourier transform infrared spectroscopy (FTIR) and 1 H NMR spectroscopy. Meanwhile, the prepared anion exchange membranes were characterized by FTIR, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and thermogravimetric analysis (TGA). In addition, the ion exchange capacity (IEC), water uptake (W R ), tensile strength (TS), linear expansion rate (LER), and elongation at break (E b ) of each membrane were characterized. In DD application tests, acid dialysis coefficients (U H + ) of the membranes ranged from 8.56 × 10 −3 m/h to 27.33 × 10 −3 m/h and separation factor (S) values were all above 22.55. These results showed that anion exchange membranes had higher U H + and S values than commercial membrane DF-120 (U H + is 9.00 × 10 −3 m/h and S is 18.00) and other better general properties including the LER, TGA, TS, and so on. The prepared membranes showed a wide application prospective for acid recovery via DD.

Preparation of a Cation Exchange Membrane by a Sol-Gel Method-Based Polyvinyl Alcohol to Improve Alkali Recovery via Diffusion Dialysis in the Textile Industry

“…This indicated the presence of hydroxyl and silicon oxygen bonds in the membrane, which was also confirmed by infrared detection. The peak at 102 eV was Si 2p, which confirmed the presence of the Si bond in the membrane [49]. The tensile vibration of Si-O-Si and Si-O-C at 1018 cm −1 in FTIR spectra also confirmed the existence of Si.…”

“…taking membrane SAGS-16 as an example, the XPS signal can The peak at 537-526 eV is O 1s. The peak in this region is related to -OH on the PVA chain and -O-in the silane coupling agent [49]. For O 1 s, it was divided into two subspecies, including -OH (located at ca.…”

Anion Exchange Membrane Based on BPPO/PECH with Net Structure for Acid Recovery via Diffusion Dialysis

“…Thirdly, the increase in the degree of crosslinking with the increase in the PECH content led to the increase in the S value. Finally, due to the interaction between electric charges, the greater the IEC value of the membrane, the greater the mutual repulsion of Fe 2+ , which limited the transmission of Fe 2+ , so the S value of the membrane slightly increased [5,[56][57][58]. Compared with DF-120B and previously reported membranes based on BPPO, as shown in Table 3, the prepared membranes had advantages in acid recovery by DD.…”

Side Chain Crosslinked Anion Exchange Membrane for Acid Concentration by Electrodialysis

“…Consequently, these AEMs face limitations regarding acid recovery efficiency and concentration which impact current efficiency and energy consumption levels . Thus, the development of acid-blocking AEMs with exceptional performance is crucial for acid concentration and recovery through ED technology. − …”