Process and Performance of Desulfurizing Thenardite Resource Utilization Based on Electrodialysis with Modified Ion Exchange Membranes
The by-product thenardite (sodium sulfate), generated during wet flue gas desulfurization, poses significant environmental and land-use challenges due to its inherent chemical properties and low resource recovery efficiency. This study addresses this issue by developing a novel approach that leverag...
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Editorial Office of Energy Environmental Protection
2025-08-01
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| Series: | 能源环境保护 |
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| Online Access: | https://doi.org/10.20078/j.eep.20250315 |
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| author | Jie ZHAO Xiaofeng LIN Wei ZHANG Bo LI Kai LI |
| author_facet | Jie ZHAO Xiaofeng LIN Wei ZHANG Bo LI Kai LI |
| author_sort | Jie ZHAO |
| collection | DOAJ |
| description | The by-product thenardite (sodium sulfate), generated during wet flue gas desulfurization, poses significant environmental and land-use challenges due to its inherent chemical properties and low resource recovery efficiency. This study addresses this issue by developing a novel approach that leverages modified ion exchange membranes in the electrodialysis process to optimize the separation efficiency of sulfate and sodium ions, facilitating the resource utilization of thenardite. Cation exchange membranes were enhanced through modification with pyrrole and tetraethyl orthosilicate to improve their mechanical strength and sodium ion migration. Anion exchange membranes were treated with polyethyleneimine and dopamine to optimize their surface structure and increase selective permeability for sulfate ions. Characterization techniques, including Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM), revealed that the modified membranes exhibited a significantly enhanced surface negative charge, a more uniform pore distribution, and improved structural compactness. Contact angle measurements indicated that these modifications increased membrane hydrophilicity, thereby increasing ion migration efficiency. Experimental results demonstrated that sodium ion permeability increased by 0.36% for pyrrole-modified cation exchange membranes compared to unmodified membranes, while dopamine-modified anion exchange membranes achieved a 12.57% improvement in sulfate ion permeability. Further electrodialysis experiments showed that, under an applied voltage of 50 V at room temperature, the combination of modified membranes enabled efficient separation of sulfate and sodium ions, achieving a purity of 99%. Notably, after six testing cycles, the modified membranes exhibited excellent stability in ion selectivity and migration efficiency, meeting the requirements for long-term industrial operation. This study innovatively integrates multiple modification strategies to optimize ion exchange membranes, significantly enhancing the separation efficiency and operational stability of the electrodialysis process for thenardite resource utilization. The findings provide crucial technical support for the green resource recovery of thenardite and offer a reference for the treatment of complex industrial wastewater. |
| format | Article |
| id | doaj-art-fe8da751f1094b77a0d7542f7894de84 |
| institution | Kabale University |
| issn | 2097-4183 |
| language | zho |
| publishDate | 2025-08-01 |
| publisher | Editorial Office of Energy Environmental Protection |
| record_format | Article |
| series | 能源环境保护 |
| spelling | doaj-art-fe8da751f1094b77a0d7542f7894de842025-08-20T04:00:28ZzhoEditorial Office of Energy Environmental Protection能源环境保护2097-41832025-08-0139414715710.20078/j.eep.202503152024-12-22-0001Process and Performance of Desulfurizing Thenardite Resource Utilization Based on Electrodialysis with Modified Ion Exchange MembranesJie ZHAO0Xiaofeng LIN1Wei ZHANG2Bo LI3Kai LI4Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, ChinaFaculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, ChinaFaculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, ChinaFaculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, ChinaFaculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, ChinaThe by-product thenardite (sodium sulfate), generated during wet flue gas desulfurization, poses significant environmental and land-use challenges due to its inherent chemical properties and low resource recovery efficiency. This study addresses this issue by developing a novel approach that leverages modified ion exchange membranes in the electrodialysis process to optimize the separation efficiency of sulfate and sodium ions, facilitating the resource utilization of thenardite. Cation exchange membranes were enhanced through modification with pyrrole and tetraethyl orthosilicate to improve their mechanical strength and sodium ion migration. Anion exchange membranes were treated with polyethyleneimine and dopamine to optimize their surface structure and increase selective permeability for sulfate ions. Characterization techniques, including Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM), revealed that the modified membranes exhibited a significantly enhanced surface negative charge, a more uniform pore distribution, and improved structural compactness. Contact angle measurements indicated that these modifications increased membrane hydrophilicity, thereby increasing ion migration efficiency. Experimental results demonstrated that sodium ion permeability increased by 0.36% for pyrrole-modified cation exchange membranes compared to unmodified membranes, while dopamine-modified anion exchange membranes achieved a 12.57% improvement in sulfate ion permeability. Further electrodialysis experiments showed that, under an applied voltage of 50 V at room temperature, the combination of modified membranes enabled efficient separation of sulfate and sodium ions, achieving a purity of 99%. Notably, after six testing cycles, the modified membranes exhibited excellent stability in ion selectivity and migration efficiency, meeting the requirements for long-term industrial operation. This study innovatively integrates multiple modification strategies to optimize ion exchange membranes, significantly enhancing the separation efficiency and operational stability of the electrodialysis process for thenardite resource utilization. The findings provide crucial technical support for the green resource recovery of thenardite and offer a reference for the treatment of complex industrial wastewater.https://doi.org/10.20078/j.eep.20250315ion-exchange membranemirabiliteelectrodialysissurface modificationresource utilization |
| spellingShingle | Jie ZHAO Xiaofeng LIN Wei ZHANG Bo LI Kai LI Process and Performance of Desulfurizing Thenardite Resource Utilization Based on Electrodialysis with Modified Ion Exchange Membranes 能源环境保护 ion-exchange membrane mirabilite electrodialysis surface modification resource utilization |
| title | Process and Performance of Desulfurizing Thenardite Resource Utilization Based on Electrodialysis with Modified Ion Exchange Membranes |
| title_full | Process and Performance of Desulfurizing Thenardite Resource Utilization Based on Electrodialysis with Modified Ion Exchange Membranes |
| title_fullStr | Process and Performance of Desulfurizing Thenardite Resource Utilization Based on Electrodialysis with Modified Ion Exchange Membranes |
| title_full_unstemmed | Process and Performance of Desulfurizing Thenardite Resource Utilization Based on Electrodialysis with Modified Ion Exchange Membranes |
| title_short | Process and Performance of Desulfurizing Thenardite Resource Utilization Based on Electrodialysis with Modified Ion Exchange Membranes |
| title_sort | process and performance of desulfurizing thenardite resource utilization based on electrodialysis with modified ion exchange membranes |
| topic | ion-exchange membrane mirabilite electrodialysis surface modification resource utilization |
| url | https://doi.org/10.20078/j.eep.20250315 |
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