Polycationic Polymer-Regulated Assembling of 2D MOF Nanosheets for High-Performance Nanofiltration
- 8 August 2017
- journal article
- research article
- Published by American Chemical Society (ACS) in ACS Applied Materials & Interfaces
- Vol. 9 (33), 28079-28088
- https://doi.org/10.1021/acsami.7b08383
Abstract
Herein, a two-dimensional metal–organic framework (2D MOF) made of iron porphyrin complex (TCP(Fe)) interconnected with divalent metal ion (M = Zn, Co, and Cu) is used to construct a selective layer, which is explored as an ultrafast and energy-saving nanofiltration (NF) membrane for removing organic dyes from water. Among the layered 2D M-TCP(Fe) membranes, Zn-TCP(Fe) membranes display the highest water permeance, which is 3 times higher than graphene-based membranes with similar rejection. To further improve the separation performances, we utilize polycations to anchor the periphery carboxylic groups of nanosheets, regulating the assembly of 2D Zn-TCP(Fe) nanosheets to produce a new class of crack-free selective layer possessing ultrathin and highly ordered nanochannels for efficient NF. Benefiting from these structural features, our polycation-regulated 2D Zn-TCP(Fe) membranes could offer ultrahigh permeance of 4243 L m–2 h–1 bar–1 (2-fold higher than its pristine) and excellent rejection rates (over 90%) for organic dye with size larger than 0.8 × 1.1 nm. This permeance value is about 2 orders of magnitude higher than the commercial polymeric NF membrane. Additionally, the membranes demonstrate 20–40% salt rejection.Funding Information
- Department of Chemical and Biomolecular Engineering, National University of Singapore (R-279-000-467-281)
This publication has 41 references indexed in Scilit:
- Synthetic Two‐Dimensional Materials: A New Paradigm of Membranes for Ultimate SeparationAdvanced Materials, 2016
- Open‐Pore Two‐Dimensional MFI Zeolite Nanosheets for the Fabrication of Hydrocarbon‐Isomer‐Selective Membranes on Porous Polymer SupportsAngewandte Chemie-International Edition, 2016
- High Efficiency Adsorption and Removal of Selenate and Selenite from Water Using Metal–Organic FrameworksJournal of the American Chemical Society, 2015
- Graphene-based membranesChemical Society Reviews, 2015
- Molecular Separation with Organic Solvent Nanofiltration: A Critical ReviewChemical Reviews, 2014
- Selective Trans-Membrane Transport of Alkali and Alkaline Earth Cations through Graphene Oxide Membranes Based on Cation−π InteractionsACS Nano, 2014
- Modeling the Effect of Charge Density in the Active Layers of Reverse Osmosis and Nanofiltration Membranes on the Rejection of Arsenic(III) and Potassium IodideEnvironmental Science & Technology, 2012
- A simplified method for elucidating the effect of size exclusion on nanofiltration membranesSeparation and Purification Technology, 2012
- The Future of Seawater Desalination: Energy, Technology, and the EnvironmentScience, 2011
- Solvent resistant nanofiltration: separating on a molecular levelChemical Society Reviews, 2007