Self-assembly of stable and high-performance molecular cage-crosslinked graphene oxide membranes for contaminant removal

Membrane separation is regarded as efficient technology to alleviate global water crisis. Two-dimensional membranes are promising for contaminant removal from wastewaters, but their uncontrollable transport pathway and instability hinder the further development. In this study, the high-performance a...

Full description

Saved in:
Bibliographic Details
Published in:Journal of hazardous materials 2022-10, Vol.439, p.129708-129708, Article 129708
Main Authors: Kuang, Baian, Xiang, Xiangmei, Su, Pengcheng, Yang, Wulin, Li, Wanbin
Format: Article
Language:English
Subjects:
Contaminant removal
Crosslinking
Graphene oxide membranes
Intercalation
Metal-organic polyhedrons
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:Membrane separation is regarded as efficient technology to alleviate global water crisis. Two-dimensional membranes are promising for contaminant removal from wastewaters, but their uncontrollable transport pathway and instability hinder the further development. In this study, the high-performance and stable two-dimensional framework membranes are self-assembled by graphene oxide (GO) nanosheets and amino-appended metal-organic polyhedrons (MOPs) for water purification and remediation. The MOP molecular cages are uniformly intercalated between GO nanosheets and enriched at defects/edges, and can crosslink membranes, to provide in-plane selective channels, refine vertical passageways, and fix out-of-plane interlayer spaces. The prepared GO/MOP framework membranes have improved stability and nanofiltration performance under cross-flow condition, can keep performance in water after 50 h filtration, and show high rejections over 92% for Na2SO4 and 99% for antibiotic and dye contaminants with molecular weights over 280 g mol−1, and sixfold permeance as that of GO membranes. Our molecular cage-intercalated and crosslinked two-dimensional frameworks offer an alternative route to design robust membranes for efficient removal of contaminants in wastewaters. [Display omitted] •Metal-organic polyhedron-intercalated and crosslinked GO membranes are designed.•Uniformly distributed molecular cages refine vertical and interlayer pathways.•Membranes show good performance for removal of Na2SO4, dye, and antibiotic.•Membranes have great stability and sixfold permeance under cross-flow conditions.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2022.129708