Sub-4 nanometer porous membrane enables highly efficient electrodialytic fractionation of dyes and inorganic salts

Jiuyang Lin, Zijian Yu, Tianci Chen, Junming Huang, Lianxin Chen, Jiangjing Li, Xuewei Li, Xiaolei Huang, Jianquan Luo, Elisa Yun Mei Ang, William Toh, Peng Cheng Wang, Teng Yong Ng, Dong Han Seo, Shuaifei Zhao, Kuo Zhong (), Ming Xie (), Wenyuan Ye (), Bart Bruggen and Yinhua Wan ()
Additional contact information
Jiuyang Lin: Jiangxi University of Science and Technology
Zijian Yu: Fuzhou University
Tianci Chen: Chinese Academy of Sciences
Junming Huang: Fuzhou University
Lianxin Chen: Fuzhou University
Jiangjing Li: Fuzhou University
Xuewei Li: Chinese Academy of Sciences
Xiaolei Huang: Chinese Academy of Sciences
Jianquan Luo: Chinese Academy of Sciences
Elisa Yun Mei Ang: Singapore Institute of Technology
William Toh: Nanyang Technological University
Peng Cheng Wang: Singapore Institute of Technology
Teng Yong Ng: Nanyang Technological University
Dong Han Seo: Korea Institute of Energy Technology (KENTECH)
Shuaifei Zhao: Geelong
Kuo Zhong: HuiKang Advanced Institute of Technology
Ming Xie: University of Bath
Wenyuan Ye: Jiangxi University of Science and Technology
Bart Bruggen: KU Leuven
Yinhua Wan: Chinese Academy of Sciences

Nature Communications, 2025, vol. 16, issue 1, 1-10

Abstract: Abstract During the synthesis of dyes, desalination of high-salinity dye-containing waste liquor is a critical premise for high-quality, clean dye production. Conventional membrane processes, such as electrodialysis, nanofiltration and ultrafiltration, are inevitably subjected to serious membrane fouling, deteriorating the dye/salt fractionation efficacy. Integrating the technical merits of electrodialysis and pressure-driven membrane separation, we devise an electro-driven filtration process using a tight ultrafiltration membrane as alternative to conventional anion exchange membrane for rapid anion transfer, in view of dye desalination and purification. By employing a sub-4 nanometer tight ultrafiltration membrane as anion conducting membrane, the electro-driven filtration process achieves 98.15% desalination efficiency and 99.66% dye recovery for one-step fractionation of reactive dye and NaCl salt, markedly outperforming the system using commercial anion exchange membranes. Notably, the electro-driven filtration system displays a consistently high and stable fractionation performance for dyes and salts with unprecedentedly low membrane fouling through an eight-cycle continuous operation. Our results demonstrate that the electro-driven filtration process using nanoporous membranes as high-performance anion conducting membranes shows a critical potential in fractionation of organic dyes and inorganic salts, unlocking the proof of concept of nanoporous membranes in electro-driven application.

Date: 2025
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DOI: 10.1038/s41467-025-58873-5

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