4.7 Article

Mussel-inspired tannic acid/polyethyleneimine assembling positively-charged membranes with excellent cation permselectivity

Journal

SCIENCE OF THE TOTAL ENVIRONMENT
Volume 817, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.scitotenv.2022.153051

Keywords

Mussel-inspired modification; Positively-charged membrane; Ion separation; Upper bound plot; Layer by layer assembly; Resource recovery

Funding

  1. National Natural Science Foundation of China [21878062, 22178076]
  2. Natural Science Foundation of Heilong-jiang Province for Distinguished Young Scholars [JQ2020B001, HITTY-20190033]
  3. Fundamental Research Funds for the Central Universities
  4. State Key Laboratory of Urban Water Resource and Environment (Harbin Institute of Technology) [2020DX02]

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The extraction of valuable target ions through monovalent cation exchange membranes (MCEMs) has great potential in the fields of energy and environment. Mussel-inspired surface modification methods have been used to improve the separation performance of membranes, increasing cation fluxes and permselectivity.
The extraction of valuable target ions through monovalent cation exchange membranes (MCEMs) has been increasingly attracting in modern energy and environmental fields. However, the separation performance of MCEMs in terms of the permselectivity and cation fluxes, is typically restricted by membrane architecture and applied materials. Recently, mussel-inspired surface modification methods have been deployed in new membrane fabrications with special surface characteristics and functions. Herein, a facile layer-by-layer assembly method was designed to construct a series of de novo positively-charged tannic acid/polyethyleneimine (TA/PEI) membranes containing a negatively charged support membrane and a TA/PEI selective layer. Notably, the peculiar support membrane with a much dense structure and abundant cation exchange groups can enable our TA/PEI membranes to possess high total cation fluxes. The selective layer with vast positive charges ensures mussel-inspired TA/PEI assembled positively-charged membranes to have a high permselectivity. Most importantly, compared with the separation performance of the state-of-the-art MCEMs, the superior separation performance of our developed new MCEMs at 5 mA.cm(-2) and 10 mA.cm(-2) is beyond the current Upper Bound plot between Na+ flux and the permselectivity (Na+/Mg2+), which opens new avenues for the construction of MCEMs. Furthermore, high purity of Li+ (95.37%) can be obtained through deploying mussel-inspired TA/PEI assembled positively-charged membranes with high permselectivity of Li+/Mg2+ (13.72), proving its great potentials in the field of resource recovery towards sustainability.

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