Membrane Separation Process for Water Treatment

A special issue of Separations (ISSN 2297-8739). This special issue belongs to the section "Materials in Separation Science".

Deadline for manuscript submissions: 10 October 2025 | Viewed by 358

Special Issue Editor


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Guest Editor
School of Environmental Science and Engineering, Donghua University, Shanghai, China
Interests: membrane science and technology; Industrial pollution prevention and control

Special Issue Information

Dear Colleagues,

As a rapidly rising separation technology from the 1960s, membrane separation technology is categorised by its multifaceted functionalities involving encompassing separation, concentration, purification, and refining processes. Notably, this technology is distinguished by its efficiency, energy conservation, environmental protection, and ease of operation. The fundamental mechanism of this technology is the utilisation of the membrane's selective permeability to manipulate the movement of components across membrane under the influence of pressure, electric field, or temperature gradient. This process enables the separation, classification, purification, and enrichment components of purpose. Membrane technology also constitutes a significant unit of water treatment methods, achieving effective separation and concentration of resources, thereby promoting their recovery, reuse, and recycling. The title of this Special Issue is “Membrane Separation Process for Water Treatment”, aiming to seek original studies investigating new membrane materials, membrane process theory and methods, new technology and process of water treatment membranes, new pollutant removal, sustainable water treatment membrane technology, and other key topics. Contributions in the form of new insights and perspectives on this rapidly evolving field are invited.

Prof. Dr. Fang Li
Guest Editor

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Keywords

  • advanced separation techniques
  • resource recovery
  • environmental conservation
  • water treatment
  • membrane separation process

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Published Papers (1 paper)

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Research

14 pages, 2671 KiB  
Article
Ion Transport Mechanism in the Sub-Nano Channels of Edge-Capping Modified Transition Metal Carbides/Nitride Membranes
by Yinan Li, Xiangmin Xu, Xiaofeng Fang and Fang Li
Separations 2025, 12(4), 78; https://doi.org/10.3390/separations12040078 - 28 Mar 2025
Viewed by 246
Abstract
Edge-capping modified MXene membranes with new channels created by lateral nanosheets are of great research significance. After introducing tripolyphosphate (STPP) to Ti edges of Ti3C2Tx nanosheets and fabricating the STPP-MXene membranes edge-capping method, this research investigated the performance [...] Read more.
Edge-capping modified MXene membranes with new channels created by lateral nanosheets are of great research significance. After introducing tripolyphosphate (STPP) to Ti edges of Ti3C2Tx nanosheets and fabricating the STPP-MXene membranes edge-capping method, this research investigated the performance optimization mechanism of STPP-modified MXene membranes in terms of salt permeability (NaCl, Na2SO4, MgCl2, and MgSO4) and transmembrane energy barriers (Esalt) through the concentration gradient permeation test. Experimental results demonstrated an approximately 1.86-fold enhancement in salt flux (Js) compared to the MXene membranes. The solution–diffusion model was also introduced to evaluate the salt solubility (Ks) and diffusivity (Ds) during permeation. Furthermore, analysis of transmembrane energy barriers revealed that STPP modification induced significantly larger reductions in activation energy for magnesium salts (MgSO4: 55.1%; MgCl2: 47.4%) compared to sodium salts (NaCl: 30.5%; Na2SO4: 30.9%). This phenomenon indicated the weakened electrostatic interactions between high-valent Mg2+ and the modified lateral membrane Ti edges, whereas the limited charge density of Na+ resulted in relatively modest optimization. The results highlight the contribution of STPP capping on the edges of adjacent lateral nanosheets. Therefore, the modification increased the transportation rate of cations across the MXene membrane by more than twice, thus advancing the application of 2D MXene membranes in resource recovery. Full article
(This article belongs to the Special Issue Membrane Separation Process for Water Treatment)
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