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Development of Functionalized Porous Materials for Adsorption and Separations

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

Deadline for manuscript submissions: closed (10 December 2025) | Viewed by 996

Special Issue Editors


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Guest Editor
School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, UK
Interests: ion-exchange; porous materials; solvent extraction; adsorption; microporous polymers; leaching; waste valorisation; water purification; heavy metals; precious metals; critical minerals

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Guest Editor
Department of Technology in Environmental Engineering, Faculty of Civil Engineering and Environmental Sciences, Białystok University of Technology, 15-351 Białystok, Poland
Interests: environmental engineering; adsorption; activated carbon; production AC; air pollution; water treatment; water purification; heavy metals

Special Issue Information

Dear Colleagues,

The selective separation, purification and recovery of many types of chemical species is imperitive to the principles of sustainability and circular economy. Adsorption technology is, in many ways, the ideal tool to accelerate this research need: it is inherrently low-energy, produces minimal secondary waste-streams and furthermore contributes to the remediation of environment and industrial effluent.

Many interesting and exciting new porous materials have been reported in recent years, some of which seem to offer fundamental advantages over the state-of-the-art, in terms of performance and sustainability. Still, the ‘bedrock’ technologies of polymeric ion-exchange resins and inorganic zeolites are overwhelmingly favoured in the design and development of chemical separation processes. Only by gaining a deeper understanding of the chemical interactions between sorbent and sorbate, in porous materials, can we truly harnass the power of these new technologies.

Submissions (original research and review articles) are invited for this special issue, which showcase the capabilities of porous materials, of all categories, to address the need for new and enhanced chemical separations via adsorption and ion-exchange. Reports of novel materials, with accompanying characterisation, are encouraged. However, contributions on use of off-the-shelf technologies for new applications, plus method development and production process infensification for existing materials are also highly welcome, as are articles focussing on life-cycle and technicoeconomic aspects of adsorbent use.

Dr. Thomas J. Robshaw
Dr. Ewa Szatyłowicz
Guest Editors

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Separations is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • ion-exchange
  • adsorption
  • porous materials
  • chemical separation
  • water treatment
  • hydrometallurgy
  • gas capture
  • resource recovery

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Published Papers (2 papers)

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Research

13 pages, 7158 KB  
Article
Gas–Liquid Coalescing Filter with Wettability-Modified Gradient Pore Structure: Achieving Low Resistance, High Efficiency and Long Service Life
by Ziqi Yang, Jian Li, Shuaiyi Ma and Zhen Wang
Separations 2026, 13(1), 32; https://doi.org/10.3390/separations13010032 - 15 Jan 2026
Viewed by 401
Abstract
Widely used in treating oil mist aerosols generated from metalworking processes, conventional gas–liquid coalescing filters face drawbacks such as increased energy consumption, performance limitations, and shortened service life due to high steady-state pressure drop. To address these issues, this study proposes an innovative [...] Read more.
Widely used in treating oil mist aerosols generated from metalworking processes, conventional gas–liquid coalescing filters face drawbacks such as increased energy consumption, performance limitations, and shortened service life due to high steady-state pressure drop. To address these issues, this study proposes an innovative design for a filter based on wettability-regulated gradient pore structure. Using glass fiber filter media with different pore size parameters as the substrate and incorporating an intermediate mesh layer, a three-layer filtration structure of “large-pore filtration layer—mesh layer—small-pore filtration layer” was constructed. The surface wettability of each layer was regulated by a self-developed surface modifier, producing gradient pore structure filters with different wettability configurations. The variations in key performance parameters, including steady-state pressure drop, filtration efficiency, saturation, and service life, were systematically evaluated for these configurations. Experimental results demonstrated that the configuration with an “oleophobic large-pore filtration layer—mesh layer—oleophilic small-pore filtration layer” yielded the best overall performance. Analysis based on the “jump-channel” model indicated that the gradient pore structure achieves progressive droplet filtration and optimizes droplet coalescence and capture through wettability differences. Consequently, while maintaining exceptional filtration efficiency (>99%), this configuration significantly reduces the steady-state pressure drop by over 34% and effectively extends the service life by more than 66%. This wettability-regulated gradient pore structure provides a novel technical pathway for addressing the challenges of balancing pressure drop and filtration efficiency, as well as extending the service life, in gas–liquid coalescing filters. Full article
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17 pages, 3923 KB  
Article
Silver-Functionalized Ionic Liquid@MCM-41 Adsorbents for C2H4/C2H6 Separation
by Yelin Yang, Zongxu Wang, Dan Li, Mengyu Ren, Defu Chen and Haifeng Dong
Separations 2026, 13(1), 28; https://doi.org/10.3390/separations13010028 - 13 Jan 2026
Viewed by 339
Abstract
Ionic liquids (ILs) have attracted considerable attention for light olefin separation owing to their negligible vapor pressure, excellent thermal stability, and tunable molecular structures. However, their intrinsically high viscosity severely restricts gas diffusion, leading to poor mass-transfer efficiency and limited separation performance in [...] Read more.
Ionic liquids (ILs) have attracted considerable attention for light olefin separation owing to their negligible vapor pressure, excellent thermal stability, and tunable molecular structures. However, their intrinsically high viscosity severely restricts gas diffusion, leading to poor mass-transfer efficiency and limited separation performance in bulk form. Herein, we report the develop a high-performance adsorbent by immobilizing a silver-functionalized ionic liquid within ordered mesoporous MCM-41 to overcome the diffusion limitations of bulk ILs. The IL@MCM-41 composites were prepared via an impregnation–evaporation strategy, and their mesostructural integrity and textural evolution were confirmed by XRD and N2 sorption analyses. Their C2H4/C2H6 separation performance was subsequently evaluated. The composite with a 70 wt% IL loading achieves a high C2H4 uptake of 25.68 mg/g and a C2H4/C2H6 selectivity of 15.59 in breakthrough experiments (298 K, 100 kPa). X-ray photoelectron spectroscopy results are consistent with the presence of reversible Ag+–π interactions, which governs the selective adsorption of C2H4. Additionally, the composite exhibits excellent thermal stability (up to 570 K) and maintains stable separation performance over 10 adsorption–desorption cycles. These IL@MCM-41 composites have significant potential for designing sorbent materials for efficient olefin/paraffin separation applications. Full article
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