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Ion-Exchange Membranes for the Fabrication of Reverse Electrodialysis Device
Published on: July 20, 2021
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Innovative BPPO Anion Exchange Membranes Formulation Using Diffusion Dialysis-Enhanced Acid Regeneration System
Muhammad Imran Khan1, Majeda Khraisheh2, Fares AlMomani2
1Research Institute of Sciences and Engineering, University of Sharjah, Sharjah 27272, United Arab Emirates.
Membranes
|April 30, 2021
Summary
New anion exchange membranes (AEMs) were synthesized for efficient acid recovery from waste streams using diffusion dialysis. These novel membranes show superior performance compared to commercial options, offering a sustainable solution for acid recycling.
Area of Science:
- Materials Science
- Environmental Engineering
- Chemical Engineering
Background:
- Acid recycling from aqueous waste is environmentally critical.
- Diffusion dialysis using anion exchange membranes (AEMs) is a key technology for acid recovery.
- Developing high-performance AEMs is essential for efficient acid recovery processes.
Purpose of the Study:
- To synthesize novel brominated poly(2,6-dimethyl-1,4-phenylene oxide) (BPPO)-based anion exchange membranes (AEMs) via triphenylphosphine (TPP) quaternization.
- To evaluate the synthesized AEMs for acid recovery through diffusion dialysis.
- To compare the performance of the new AEMs against a commercial membrane.
Main Methods:
- Synthesis of AEMs by quaternizing BPPO with TPP.
- Characterization of AEMs using Fourier transform infrared (FTIR) spectroscopy.
- Evaluation of membrane properties: water uptake, ion exchange capacity (IEC), and linear swelling ratio (LSR).
- Testing acid recovery performance in a diffusion dialysis stack with HCl/FeCl2 mixtures.
Main Results:
- Successful synthesis of TPP-modified BPPO-based AEMs confirmed by FTIR.
- AEMs exhibited favorable properties: 44-66% water uptake, 1.22-1.86 mmol/g IEC, 8-20% LSR, and good stability.
- Synthesized AEMs achieved higher acid recovery (UH+: 6.7-26.3 x 10-3 m/h, S: 27-49) than the commercial DF-120B membrane (UH+: 0.004 m/h, S: 24.3).
Conclusions:
- The developed TPP-modified BPPO-based AEMs demonstrate excellent potential for acid recovery via diffusion dialysis.
- These novel membranes offer a more efficient and sustainable alternative to current commercial options.
- The study highlights the viability of these AEMs for industrial acid recycling applications.
Keywords:
BPPOanion exchange membranediffusion dialysision exchange capacitytriphenylphosphinewater uptakeMore Related Videos
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