Design of Loose Nanofiltration Membranes by Tailoring Hydrophilicity and Molecular Mass of Deep Eutectic Solvent Additives: Thermodynamics and Kinetics of Phase Inversion

IF 7.1 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY ACS Sustainable Chemistry & Engineering Pub Date : 2024-11-15 DOI:10.1021/acssuschemeng.4c06550
Zahra Saeb, Soheila Shokrollahzadeh, Yasamin Bide
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Abstract

The effectiveness of the membranes is largely influenced by the characteristics of the additives. This study introduces a novel approach to the fabrication of loose nanofiltration (LNF) membranes by utilizing deep eutectic solvents (DESs) as innovative pore formers. For the first time, we systematically investigated the combined effects of DES hydrophilicity and molecular mass on membrane morphology during the phase inversion process. Four distinct polysulfone (PSF)-based LNF membranes with the same nature and different hydrophilicity and molecular mass were synthesized to elucidate the thermodynamic and kinetic parameters influencing casting solution behavior. Our analysis reveals that an increase in DES molecular mass correlates with elevated thermodynamic parameters, while viscosity increases contribute to enhanced kinetic hindrance during membrane formation. Furthermore, the study demonstrates that higher hydrophilicity in DES additives not only reduces thermodynamic instability but also encourages the formation of finger-like pores throughout the membrane’s structure. The synthesized membranes exhibited superior separation performance, achieving over 86% rejection of Congo red dye and less than 3% rejection of sodium ions. These findings present a promising strategy for designing membranes with the desired performance for salt–dye separation, mitigating water waste, and improving sustainability.

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通过调整深共晶溶剂添加剂的亲水性和分子质量设计松散的纳滤膜:相反转的热力学和动力学
膜的效果在很大程度上受添加剂特性的影响。本研究介绍了一种利用深共晶溶剂(DES)作为创新孔形成剂来制造疏松纳滤膜(LNF)的新方法。我们首次系统地研究了相反转过程中 DES 亲水性和分子质量对膜形态的综合影响。我们合成了四种性质相同、亲水性和分子质量不同的基于聚砜(PSF)的 LNF 膜,以阐明影响浇铸溶液行为的热力学和动力学参数。我们的分析表明,DES 分子质量的增加与热力学参数的升高有关,而粘度的增加则有助于增强膜形成过程中的动力学阻碍。此外,研究还表明,DES 添加剂中较高的亲水性不仅能降低热力学不稳定性,还能促进整个膜结构中指状孔的形成。合成的膜具有优异的分离性能,对刚果红染料的截留率超过 86%,对钠离子的截留率低于 3%。这些发现为设计具有所需性能的盐染分离膜、减少水资源浪费和提高可持续发展能力提供了一种可行的策略。
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来源期刊
ACS Sustainable Chemistry & Engineering
ACS Sustainable Chemistry & Engineering CHEMISTRY, MULTIDISCIPLINARY-ENGINEERING, CHEMICAL
CiteScore
13.80
自引率
4.80%
发文量
1470
审稿时长
1.7 months
期刊介绍: ACS Sustainable Chemistry & Engineering is a prestigious weekly peer-reviewed scientific journal published by the American Chemical Society. Dedicated to advancing the principles of green chemistry and green engineering, it covers a wide array of research topics including green chemistry, green engineering, biomass, alternative energy, and life cycle assessment. The journal welcomes submissions in various formats, including Letters, Articles, Features, and Perspectives (Reviews), that address the challenges of sustainability in the chemical enterprise and contribute to the advancement of sustainable practices. Join us in shaping the future of sustainable chemistry and engineering.
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