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. 2023 May 11;24(10):8596.
doi: 10.3390/ijms24108596.

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

Haiyang Shen  1 , Yifei Gong  1 , Wei Chen  1 , Xianbiao Wei  2 , Ping Li  1 , Congliang Cheng  1
Affiliations

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

Haiyang Shen et al. Int J Mol Sci. .

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.

Keywords: BPPO; PECH; acid recovery; anion exchange membrane; diffusion dialysis; net structure.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
FTIR spectra of membranes 1–5 and BPPO/PECH film.
Figure 2
Figure 2
Cross-sections SEM images of membranes 1–5.
Figure 3
Figure 3
TGA diagrams of membranes 1–5.
Figure 4
Figure 4
Mechanical properties of membranes 1–5.
Figure 5
Figure 5
(a) Water uptake and linear expansion ratio of membranes 1–5, (b) ion exchange capacity of membranes 1–5.
Figure 6
Figure 6
(a) Acid dialysis coefficient (UH+) and permeability coefficient of iron ions of membranes 1–5, (b) separation coefficient (S) of membranes 1–5.
Figure 7
Figure 7
Reaction equation diagram for the preparation of ion exchange membranes.
Figure 8
Figure 8
Experimental process diagram.
Figure 9
Figure 9
Experimental device and schematic diagram.
See this image and copyright information in PMC

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