Innovative low-energy enrichment of sulfuric acid using PVDF-HFP anion exchange membranes with acid-blocking properties

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Type
Article
Citation
Yu, S., Jiang, Y., Xu, G., Ang, E. H., Xu, Z., Liao, J., & Shen, J. (2024). Innovative low-energy enrichment of sulfuric acid using PVDF-HFP anion exchange membranes with acid-blocking properties. Desalination, 580, Article 117510. https://doi.org/10.1016/j.desal.2024.117510
Author
Yu, Shuaijun
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Jiang, Yazhen
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Xu, Geting
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Ang, Edison Huixiang 
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Xu, Zhipeng
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Liao, Junbin
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Shen, Jiangnan
Abstract
In recent years, the electrodialysis (ED) technology has gained substantial attention for its role in recovering sulfuric acid from industrial wastewater. However, the typical anion exchange membranes (AEMs) have been known to exhibit notable proton leakage during ED, which can severely hinder the efficiency of acid concentration. To overcome this issue, we utilized a substrate made of poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP). This choice capitalizes on the presence of fluorine-containing groups for enhanced acid stability and tertiary amine groups to minimize water content, resulting in a significant improvement in proton-blocking capabilities of the AEMs. It is worth noting that, through a combination of partial cross-linking and quaternization, these AEMs not only maintain their acid concentration performance but also substantially reduce energy consumption. Additionally, we conducted a thorough analysis of the delicate balance between current efficiency and energy consumption in acid recovery systems. In contrast to conventional AEMs and commercially available proton-blocking membranes such as ACM, we highlight the exceptional acid concentration capability (CH+ = 1.28 M) and the low energy consumption (3.3 kWh/kg) of AEM-1.2. This research breakthrough marks a significant advancement in the development of acid-blocking AEMs and strongly advocates for more efficient sulfuric acid recovery from industrial wastewater.
Date Issued
2024
Publisher
Elsevier
Journal
Desalination
DOI
10.1016/j.desal.2024.117510
Grant ID
22008214
21878273
2021C03170
LQ20B060005
Funding Agency
National Natural Science Foundation of China
Zhejiang Provincial Key Research Development Program of China
Zhejiang Provincial Natural Science Foundation of China