Membrane Separation Technology Research, 2nd Edition

Topic Information

Dear Colleagues,

Membrane processes are separation processes, where the transported components can be separated employing a semipermeable polymeric or inorganic membrane with a particular structure. Membrane processes can generally occur without introducing additional chemicals to the feed stream and thus separate products according to their size, charges, and Gibbs hydration energy. Therefore, the membrane process, which is a type of rate-based separation using pressure (ΔP), electric (ΔE), and stream concentration (ΔC) as driving factors, has been widely utilized in the sectors of saltwater desalination, green chemical engineering, and wastewater treatment. This Topic aims to cover the latest achievements in innovative membrane materials and membrane processes. Original research and review papers with emphasis on, but not limited to, the following topics are welcome:

1. Membrane processes for desalination, classification, and purification;
2. Fabrication of new membrane materials;
3. Membrane processes integration, optimization, and intensification;
4. Membrane simulation and process modeling.

Dr. Chenxiao Jiang
Dr. Zhe Yang
Dr. Ying Mei
Topic Editors

Keywords

Participating Journals

Journal Name	Impact Factor	CiteScore	Launched Year	First Decision (median)	APC
Water water	3.0	6.0	2009	18.9 Days	CHF 2600	Submit
Membranes membranes	3.6	7.9	2011	15.3 Days	CHF 2200	Submit
Separations separations	2.7	4.5	2014	16 Days	CHF 2600	Submit
Clean Technologies cleantechnol	4.7	8.3	2019	20 Days	CHF 1800	Submit
Polymers polymers	4.9	9.7	2009	14.4 Days	CHF 2700	Submit
Materials materials	3.2	6.4	2008	15.5 Days	CHF 2600	Submit

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All Water Membranes Separations Clean Technol. Polymers Materials

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18 pages, 4416 KB  

Open AccessArticle

Fabrication of Microphase-Separated Tröger’s Base Polymer Membranes for Oxygen Enrichment

by Chaoyue Yang, Li Zhou, Qian Zhang, Ya Huang, Peixiao Zhang, Jingwen Xue, Qing Li, Weijie Sun and Jiayou Liao

Membranes 2026, 16(1), 9; https://doi.org/10.3390/membranes16010009 - 30 Dec 2025

Viewed by 358

Abstract

Tröger’s base (TB) polymers have received increasing attention as a novel class of polymers with intrinsic microporosity, particularly for applications in gas separation. In this study, TB was quaternized with hydrophobic long chains to create a microphase-separated structure to enhance gas separation performance. [...] Read more.

Tröger’s base (TB) polymers have received increasing attention as a novel class of polymers with intrinsic microporosity, particularly for applications in gas separation. In this study, TB was quaternized with hydrophobic long chains to create a microphase-separated structure to enhance gas separation performance. On one hand, the tertiary amine structure of TB enabled facile grafting modification through the Menshutkin reaction. On the other hand, microphase-separated channels were created in the quaternized Tröger’s base (QTB) membrane due to the polarity differences between the hydrophilicity of the quaternary ammonium groups and hydrophobicity of iodoalkanes, providing channels for gas transport within the membrane and thereby improving permeability selectivity. The successful synthesis of QTB membranes was confirmed by FTIR and ¹H NMR spectroscopy, while AFM and SAXS analyses validated the microphase-separated morphology. To investigate the impact of microphase separation on oxygen permeability and selectivity, different iodoalkanes and various concentrations of iodobutane were grafted onto the TB backbone. Among the prepared membranes, QTB-C₄-70% membrane exhibited the highest in O₂ permeability. Gas separation performance under different O₂ pressures and temperatures revealed that O₂ permeability decreased slightly with increasing pressure, indicating good pressure stability of the membrane. With increasing temperature, the permeability increased while the selectivity decreased. These findings demonstrated that microphase-separated QTB membranes offer a viable strategy for creating effective materials for gas separation. Full article

(This article belongs to the Topic Membrane Separation Technology Research, 2nd Edition)

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