Construction of PDA-PEI/ZIF-L@PE tight ultra-filtration (TUF) membranes on porous polyethylene (PE) substrates for efficient dye/salt separation

Shiyang Li; Chenchen Zheng; Longdou Tu; Dajian Cai; Yangxiang Huang; Congjie Gao; Yeqiang Lu; Lixin Xue

doi:10.1016/j.jhazmat.2024.133727

Construction of PDA-PEI/ZIF-L@PE tight ultra-filtration (TUF) membranes on porous polyethylene (PE) substrates for efficient dye/salt separation

J Hazard Mater. 2024 Apr 15:468:133727. doi: 10.1016/j.jhazmat.2024.133727. Epub 2024 Feb 7.

Authors

Shiyang Li¹, Chenchen Zheng², Longdou Tu², Dajian Cai², Yangxiang Huang², Congjie Gao², Yeqiang Lu³, Lixin Xue⁴

Affiliations

¹ Center for Membrane Separation and Water Science & Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China; Institute of New Materials & Industrial Technologies, Wenzhou University, Wenzhou 325024, China.
² Center for Membrane Separation and Water Science & Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China.
³ Center for Membrane Separation and Water Science & Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China. Electronic address: luyq@zjut.edu.cn.
⁴ College of Chemistry and Materials Engineering, Wenzhou University. Wenzhou, Zhejiang 325035, China; Institute of New Materials & Industrial Technologies, Wenzhou University, Wenzhou 325024, China. Electronic address: xuelx@zjut.edu.cn.

PMID: 38367434
DOI: 10.1016/j.jhazmat.2024.133727

Abstract

Tight ultra-filtration (TUF) membranes were constructed by in situ growing zinc imidazole frameworks micro-crystalline leaves (ZIF-L) in polyethylene imine (PEI) and polydopamine (PDA) deposit layers on porous polyethylene (PE) substrates. The effects of preparation conditions on the surface physical and chemical structures as well as on the dye/salt separation performance of the formed TUF membranes were systematically investigated. By inserting selective water permeation channels and increasing contacting surface areas, in situ-grown ZIF-L arrays tightly cross-linked in the coating matrix greatly increased water permeation without trading off dye/salt retention selectivity. The morphology of the included ZIF-L particles could be varied by adjusting the ligand/Zn molar ratio (α) in the preparation processes. Optimized PDA-PEI/ZIF-L@PE TUF membranes containing ZIF-L of cross-cross block morphology showed very high pure water permeability of 180 ± 20 L·m^-2·h^-1·bar^-1 (LMHB) and retention selectivity (S_CR/Na2SO4 and S_MB/Na2SO4) of 267 and 43, respectively, as well as excellent stability and anti-fouling properties.

Keywords: Dye/salt separation; High flux; PE non-woven fabrics; Tight ultrafiltration membrane; ZIF-L.