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

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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.　©　The　Author(s)　2025.

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[ 1 ] [Lin J.]Jiangxi University of Science and Technology, Ganzhou, China
[ 2 ] [Lin J.]Key Laboratory of Rare Earths, Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, China
[ 3 ] [Lin J.]School of Environment and Safety Engineering, Fuzhou University, Fuzhou, China
[ 4 ] [Yu Z.]School of Environment and Safety Engineering, Fuzhou University, Fuzhou, China
[ 5 ] [Chen T.]Key Laboratory of Rare Earths, Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, China
[ 6 ] [Huang J.]School of Environment and Safety Engineering, Fuzhou University, Fuzhou, China
[ 7 ] [Chen L.]School of Environment and Safety Engineering, Fuzhou University, Fuzhou, China
[ 8 ] [Li J.]School of Environment and Safety Engineering, Fuzhou University, Fuzhou, China
[ 9 ] [Li X.]Key Laboratory of Rare Earths, Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, China
[ 10 ] [Huang X.]Key Laboratory of Rare Earths, Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, China
[ 11 ] [Luo J.]State Key Laboratory of Biopharmaceutical Preparation and Delivery, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China
[ 12 ] [Ang E.Y.M.]Engineering Cluster, Singapore Institute of Technology, Singapore, Singapore
[ 13 ] [Toh W.]School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore, Singapore
[ 14 ] [Wang P.C.]Engineering Cluster, Singapore Institute of Technology, Singapore, Singapore
[ 15 ] [Ng T.Y.]School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore, Singapore
[ 16 ] [Seo D.H.]Institute of Energy Materials & Devices, Korea Institute of Energy Technology (KENTECH), Naju, South Korea
[ 17 ] [Zhao S.]Institute for Frontier Materials, Deakin University, Geelong, VIC, Australia
[ 18 ] [Zhong K.]HuiKang Advanced Institute of Technology, Shenyang, China
[ 19 ] [Xie M.]Department of Chemical Engineering, University of Bath, Bath, United Kingdom
[ 20 ] [Ye W.]Jiangxi University of Science and Technology, Ganzhou, China
[ 21 ] [Van der Bruggen B.]Department of Chemical Engineering, Process Engineering for Sustainable Systems (ProcESS), KU Leuven, Leuven, Belgium
[ 22 ] [Van der Bruggen B.]Faculty of Engineering and the Built Environment, Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, Pretoria, South Africa
[ 23 ] [Wan Y.]Key Laboratory of Rare Earths, Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, China

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Nature Communications

ISSN： 2041-1723

Year： 2025

Issue： 1

Volume： 16

1 4 . 7 0 0

JCR@2023

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