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Modification of polyamide TFC nanofiltration membrane for improving separation and antifouling properties
Li-Fen Liu1,2, Xiang Huang1,3, Xiao Zhang1,2
1Center for Membrane and Water Science and Technology, Ocean College, Zhejiang University of Technology Hangzhou 310014 China lifenliu@zjut.edu.cn.
RSC Advances
|May 11, 2022
Summary
A novel dendrimer trimesoyl amide amine (TMAAM) monomer modified aromatic polyamide nanofiltration membrane offers enhanced water flux and dye rejection. This TMAAM-based membrane shows excellent stability and anti-fouling properties for efficient dye/salt separation.
Area of Science:
- Materials Science
- Chemical Engineering
- Membrane Technology
Background:
- Conventional aromatic polyamide thin-film composite (TFC) nanofiltration (NF) membranes face challenges in balancing flux and selectivity.
- Modification of TFC membranes is crucial for improving separation performance and anti-fouling properties.
Purpose of the Study:
- To develop a novel TMAAM-based semi-aromatic polyamide composite NF membrane.
- To investigate the impact of the PIP/TMAAM ratio on membrane properties and separation performance.
- To evaluate the membrane's potential for dye/salt separation applications.
Main Methods:
- Interfacial polymerization was employed to prepare the TMAAM-based composite NF membrane.
- The effects of varying piperazine (PIP) to TMAAM ratios on membrane characteristics were systematically studied.
- Membrane surface properties, chemical structure, and separation performance (water flux, salt rejection) were analyzed.
Main Results:
- Increased TMAAM content led to significantly higher water flux with only a minor decrease in salt rejection.
- The membrane with a PIP/TMAAM ratio of 1 exhibited optimal separation performance due to its smoother, more hydrophilic surface.
- The modified membrane demonstrated high rejection of negatively charged dyes and high permeation of monovalent salts.
Conclusions:
- The TMAAM-modified TFC membrane offers a promising solution for dye/salt separation.
- The developed membrane exhibits excellent hydrophilicity, stability, and anti-fouling properties.
- This study presents a facile method for fabricating high-performance semi-aromatic polyamide composite NF membranes.
