Tailoring the microstructure and properties of PES/SPSf loose nanofiltration membranes using SPES as a hydrophilic polymer for the effective removal of dyes via steric hindrance and charge effect

IF 4.3 3区工程技术 Q2 ENGINEERING, CHEMICAL

Frontiers of Chemical Science and Engineering Pub Date : 2023-06-06 DOI:10.1007/s11705-023-2338-4

Xiaowei Liu, Christine Matindi, Sania Kadanyo, Mengyang Hu, Shuqian Yang, Gansheng Liu, Ran Tao, Zhenyu Cui, Xiaohua Ma, Kuanjun Fang, Jianxin Li

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引用次数: 1

Abstract

Herein, polyethersulfone (PES) and sulfonated polysulfone (SPSf) blend membranes were prepared with addition of sulfonated polyethersulfone (SPES) as a hydrophilic polymer and adipic acid as a porogen via non-solvent induced phase separation method for effective fractionation of dyes based on the influence of steric hindrance and charge effect. Raman spectroscopy and molecular dynamic simulation modeling confirmed that hydrogen bonds between PES, SPSf, SPES, and adipic acid were crucial to membrane formation and spatial arrangement. Further addition of hydrophilic SPES resulted in a membrane with reduced pore size and molecular weight cut-off as well as amplified negative charge and pure water permeance. During separation, the blend membranes exhibited higher rejection rates for nine types of small molecular weight (269.3–800 Da) dyes than for neutral polyethylene glycol molecules (200–1000 Da). This was attributed to the size effect and the synergistic effect between steric hindrance and charge repulsion. Notably, the synergistic impact decreased with dye molecular weight, while greater membrane negative charge enhanced small molecular dye rejection. Ideal operational stability and anti-fouling performance were best observed in M2 (PES/SPSf/SPES, 3.1 wt %). Summarily, this study demonstrates that SPES with −SO₃⁻ functional groups can be applied to control the microstructure and separation of membranes.

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使用SPES作为亲水性聚合物，通过空间位阻和电荷效应对PES/SPSf松散纳滤膜的微观结构和性能进行定制，以有效去除染料

基于空间位阻和电荷效应的影响，采用非溶剂诱导相分离方法，以磺化聚醚砜（SPES）为亲水性聚合物，己二酸为致孔剂，制备了聚醚砜（PES）和磺化聚砜（SPSf）共混膜，以实现染料的有效分离。拉曼光谱和分子动力学模拟模型证实，PES、SPSf、SPES和己二酸之间的氢键对膜的形成和空间排列至关重要。进一步添加亲水性SPES导致膜具有减小的孔径和分子量截止以及增大的负电荷和纯水渗透性。在分离过程中，共混膜对九种小分子量（269.3–800 Da）染料的截留率高于中性聚乙二醇分子（200–1000 Da）。这归因于尺寸效应以及空间位阻和电荷排斥之间的协同效应。值得注意的是，协同影响随着染料分子量的增加而降低，而较大的膜负电荷增强了小分子染料的截留率。在M2（PES/SPSf/SPES，3.1wt%）中观察到理想的操作稳定性和防污性能。总之，本研究表明，具有−SO3−官能团的SPES可用于控制膜的微观结构和分离。

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来源期刊

Frontiers of Chemical Science and Engineering ENGINEERING, CHEMICAL-

CiteScore

7.60

自引率

6.70%

发文量

868

审稿时长

1 months

期刊介绍： Frontiers of Chemical Science and Engineering presents the latest developments in chemical science and engineering, emphasizing emerging and multidisciplinary fields and international trends in research and development. The journal promotes communication and exchange between scientists all over the world. The contents include original reviews, research papers and short communications. Coverage includes catalysis and reaction engineering, clean energy, functional material, nanotechnology and nanoscience, biomaterials and biotechnology, particle technology and multiphase processing, separation science and technology, sustainable technologies and green processing.