4.7 Article

Deprotonated tannic acid regulating pyrrole polymerization to enhance nanofiltration performance for molecular separations under both aqueous and organic solvent environments

期刊

出版社

ELSEVIER
DOI: 10.1016/j.seppur.2022.121647

关键词

Nanofiltration membrane; Tannic acid; Intermediate layer; Polypyrrole; Polymerization; Molecular separation

资金

  1. National Natural Science Foundation of China [21878062, 22178076, 22111530113]
  2. Natural Science Foundation of Heilongjiang Province for Distinguished Young Scholars [JQ2020B001]
  3. Heilongjiang Touyan Team [HITTY-20190033]
  4. China Postdoctoral Science Foundation. [2021M690829, 2021TQ0088]
  5. Open Project of State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology [QA202127]
  6. State Key Laboratory of Separation Membranes and Membrane Processes (Tiangong University) [M202105]
  7. Fundamental Research Funds from the Central Universities of Ministry of Education

向作者/读者索取更多资源

The researchers designed a high-performance nanofiltration membrane by tuning the formation and polymerization of the selective layer through an intermediate layer. This breakthrough overcomes the trade-off between permeance and selectivity, providing a potential alternative for next-generation molecular separation membranes.
Nanofiltration with precise separation ability demonstrates the increasing importance in water treatment and high-value substance recycling compared with traditional energy-intensive separation technologies. Nevertheless, nanofiltration membranes still suffer from the permeance-selectivity trade-off issue. Herein, we designed the de novo nanofiltration membrane with enhanced separation performance by adopting deprotonated tannic acid (TA) as intermediate layer to tune pyrrole polymerizaiton for forming the polypyrrole selective layer. TA were coated followed by in-situ polymerization of pyrrole and they assembled based on the strong electrostatic and hydrogen bonding interaction. The deprotonation of phenolic hydroxyl groups in TA effectively regulated the polymerization process of pyrrole to obtain the synthesized nanofiltration membrane with the average pore diameter of 0.45 nm. The optimized nanofiltration membrane exhibited a 3.7-fold increase in permeance and almost complete rejection for various dyes with different molecular weights and charges, which breaks the permance-selectivity trade-off. In addition, the synthesized membrane possessed the excellent structural stability even in polar organic solvent of tetrahydrofuran. Our new strategy for constructing high-performance nanofiltration membrane via intermediate-layer-tuned formation/polymerization of the selective layer can provide an alternative potential avenue to fabricate next-generation molecular separation membranes towards environmental remediation and resource recovery.

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