Novel Desalination Membranes: Material, Mechanism and Property

A special issue of Membranes (ISSN 2077-0375). This special issue belongs to the section "Membrane Applications".

Deadline for manuscript submissions: closed (8 August 2023) | Viewed by 2045

Special Issue Editor


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Guest Editor
School of Mechanical Engineering, Jiangsu University, Zhenjiang, Jiangsu, China
Interests: low dimensional carbon materials-based electro-mechanical mechanism and apparatus; multi-fields coupled flow and boundary properties at solid-fluid interfaces; mechanical property of carbon nanotube-polymer composite and the design of soft robot

Special Issue Information

Dear Colleagues,

Although water covers approximately 75% of the Earth surface, its availability is getting more and more strained because of population growth, climate change, and water pollution. Despite the abundance of seawater as an alternative water resource, seawater desalination is usually limited by relatively low productivity and high energy consumption. Membrane-based desalination technologies including the state-of-the-art reverse osmosis (RO) technology have been demonstrated to be more energy efficient than thermal desalination approaches. However, conventional polymeric RO membranes still suffer deficiencies such as low fouling resistance, poor selectivity, and low stability to resist chemical/heat-induced degradation. Therefore, it has been an ever-continuous endeavor to search and explore novel desalination membranes including materials, mechanism and properties, to further improve their permeability, selectivity, chemical stability, and resistance to fouling simultaneously.

Potential topics include, but are not limited to:

  • Membrane-based novel ion-selective mechanism;
  • Novel materials for desalination membranes;
  • Molecular-level design of desalination membranes;
  • Unfouling materials, design, and mechanism;
  • Tradeoff between permeability and selectivity;
  • Novel membrane-based desalination systems;
  • Future perspectives for desalination membranes.

Prof. Dr. Zhongqiang Zhang
Guest Editor

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Keywords

  • desalination
  • membranes
  • osmosis/reverse osmosis
  • permeability
  • selectivity
  • fouling
  • salt rejection
  • water flux
  • ultrathin membrane
  • unfouling materials
  • desalination system

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Published Papers (1 paper)

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Research

10 pages, 4316 KiB  
Article
Competition between Hydration Shell and Ordered Water Chain Induces Thickness-Dependent Desalination Performance in Carbon Nanotube Membrane
by Siyi Liu, Liya Wang, Jun Xia, Ruijie Wang, Chun Tang and Chengyuan Wang
Membranes 2023, 13(5), 525; https://doi.org/10.3390/membranes13050525 - 18 May 2023
Cited by 1 | Viewed by 1381
Abstract
Exploring new reverse osmosis (RO) membranes that break the permeability-selectivity trade-off rule is the ultimate goal in seawater desalination. Both nanoporous monolayer graphene (NPG) and carbon nanotube (CNT) channels have been proposed to be promising candidates for this purpose. From the perspective of [...] Read more.
Exploring new reverse osmosis (RO) membranes that break the permeability-selectivity trade-off rule is the ultimate goal in seawater desalination. Both nanoporous monolayer graphene (NPG) and carbon nanotube (CNT) channels have been proposed to be promising candidates for this purpose. From the perspective of membrane thickness, both NPG and CNT can be classified into the same category, as NPG is equivalent to the thinnest CNT. While NPG has the advantage of a high water flux rate and CNT is excellent at salt rejection performance, a transition is expected in practical devices when the channel thickness increases from NPG to infinite-sized CNTs. By employing molecular dynamics (MD) simulations, we find that as the thickness of CNT increases, the water flux diminishes but the ion rejection rate increases. These transitions lead to optimal desalination performance around the cross-over size. Further molecular analysis reveals that this thickness effect originates from the formation of two hydration shells and their competition with the ordered water chain structure. With the increase in CNT thickness, the competition-dominated ion path through CNT is further narrowed. Once above this cross-over size, the highly confined ion path remains unchanged. Thus, the number of reduced water molecules also tends to stabilize, which explains the saturation of the salt rejection rate with the increasing CNT thickness. Our results offer insights into the molecular mechanisms of the thickness-dependent desalination performance in a one-dimensional nanochannel, which can provide useful guidance for the future design and optimization of new desalination membranes. Full article
(This article belongs to the Special Issue Novel Desalination Membranes: Material, Mechanism and Property)
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