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

Abstract

In order to improve the performance of the anion exchange membrane (AEM) used in acid recovery from industrial wastewater, this study adopted a new strategy in which brominated poly (2,6-dimethyl-1,4-phenyleneoxide) (BPPO) and polyepichlorohydrin (PECH) were used as the polymer backbone of the prepared membrane. The new anion exchange membrane with a net structure was formed by quaternizing BPPO/PECH with N,N,N,N-tetramethyl-1,6-hexanediamine (TMHD). The application performance and physicochemical property of the membrane were adjusted by changing the content of PECH. The experimental study found that the prepared anion exchange membrane had good mechanical performance, thermostability, acid resistance and an appropriate water absorption and expansion ratio. The acid dialysis coefficient (UH+) of anion exchange membranes with different contents of PECH and BPPO was 0.0173–0.0262 m/h at 25 °C. The separation factors (S) of the anion exchange membranes were 24.6 to 27.0 at 25 °C. Compared with the commercial BPPO membrane (DF-120B), the prepared membrane had higher values of UH+ and S in this paper. In conclusion, this work indicated that the prepared BPPO/PECH anion exchange membrane had the potential for acid recovery using the DD method.

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

“…The alkali resistance of the membrane reflected its potential application in the field of diffusion dialysis for alkali recovery. The membrane was immersed in a 2 M NaOH environment at 25 • C for 7 days [58], and weight maintenance of the membrane was tested. The relevant data were shown in Table 5, and it can be observed clearly that the weight maintenance of SAGS-X CEM was above 88%.…”

“…showed the higher separation factor (13.6-18.1) [53], (16.9-18.5) [57]. In order to better prove the changes in different ion transport properties caused by the changes in the internal structure of the membrane, the internal transport mechanism diagram based on the corresponding data was drawn and shown in Figure 9 [54,58,59]. Compared with other membranes, the prepared membrane had good S value.…”

Anion-Exchange Membrane “Polikon A” Based on Polyester Fiber Fabric (Functionalized by Low-Temperature High-Frequency Plasma) with Oxidized Metal Nanoparticles

“…In order to improve the performance of AEMs used in acid recovery from industrial wastewater, this study adopted a new strategy in which brominated poly (2,6-dimethyl-1,4-phenyleneoxide; BPPO) and polyepichlorohydrin (PECH) were used as the polymer backbone of the prepared membrane. The new AEM with a net structure was formed by quaternizing BPPO/PECH with N,N,N,N-tetramethyl-1,6-hexanediamine [ 17 ]. It was shown in [ 18 ] that, in addition to steric hindrances, the transfer of phosphates in AEMs are affected by the ion-exchange capacity and the composition of fixed groups (strongly basic, weakly basic), as well as the degree of crosslinking of the polymer matrix.…”