Removing miscellaneous heavy metals by all-in-one ion exchange-nanofiltration membrane

•All-in-one integration of nanofiltration and ion exchange membranes.•The high removal rate of heavy metal oxyanions and heavy metal cations.•Sustainable recycling and regeneration by the electro-deionization process. The composition of wastewater containing heavy metal mixtures is often complex and...

Full description

Saved in:
Bibliographic Details
Published in:Water research (Oxford) 2022-08, Vol.222, p.118888-118888, Article 118888
Main Authors: Fu, Zheng-Jun, Jiang, Shang-Kun, Chao, Xin-Yi, Zhang, Chun-Xu, Shi, Qixun, Wang, Zhen-Yuan, Liu, Mei-Ling, Sun, Shi-Peng
Format: Article
Language:English
Subjects:
Electro-deionization
Heavy metals
Integration
Ion exchange
Nanofiltration
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•All-in-one integration of nanofiltration and ion exchange membranes.•The high removal rate of heavy metal oxyanions and heavy metal cations.•Sustainable recycling and regeneration by the electro-deionization process. The composition of wastewater containing heavy metal mixtures is often complex and poses a serious threat to human and environmental health. Effective removal of a variety of heavy metal ions with a single technology is challenging, and the conventional split integrated technologies require multi-step processing and a massive footprint. For the first time, we achieve hierarchically integrating ion exchange and nanofiltration into all-in-one “iNF” membranes. The iNF membrane has a hierarchical structure with an interfacial polymerization layer and an ion exchange layer, which can achieve highly efficient indiscriminate heavy metal ion removal, overcoming the defect that traditional nanofiltration membranes can only remove single metal cations or oxyanions. The ion exchange layer can remove heavy metal ions through sulfonic acid groups and quaternary amine groups. In addition, the ion exchange layer can be regenerated by electro-deionization, which is meaningful for sustainable membrane usage. This facile, scalable, and compact integrated process shows outstanding potential and universal applicability in complex wastewater treatment. [Display omitted]
ISSN:0043-1354
1879-2448
DOI:10.1016/j.watres.2022.118888