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Gels
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Gels in Separation Science
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Gels in Separation Science

A special issue of Gels (ISSN 2310-2861). This special issue belongs to the section "Gel Applications".

Deadline for manuscript submissions: 30 November 2024 | Viewed by 2697

Special Issue Editor

Prof. Dr. Xinjian Cheng

E-Mail Website
Guest Editor
School of Resources and Environment, Wuhan Institute of Technology, Wuhan 430079, China
Interests: synthesis of polymers; hydrogels; fluorescent sensors; heavy metal detection; nitro-compound detection and removal

Special Issue Information

Dear Colleagues,

Polymer-based hydrogels are widely used in daily life and scientific research, and can be modified and functionalized to readily obtain novel functions. Therefore, enlarging the application scope of hydrogels has attracted much attention. Once hydrogels are functionalized by introducing sensing groups, coordinating moieties, adsorbing units, and reactive sites, they can find usage in pollutant treatments. Pollutants in water, soil, and air can be detected and removed by the above-mentioned hydrogels. Functionalized hydrogels have potential to be used in the detection and separation of pollutants.

This Special Issue focuses on novel hydrogels for the sensing and separation of all kinds of pollutants. Works concerning hydrogels in separation sciences are welcome.

Prof. Dr. Xinjian Cheng
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

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. Gels 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

  • functional hydrogels
  • detection of pollutants
  • separation of pollutants

Published Papers (3 papers)

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Research

12 pages, 2769 KiB  
Article
Copper-Chelated Chitosan Microgels for the Selective Enrichment of Small Cationic Peptides
by Jean-Christophe Jacquier, Ciara Duffy, Michael O’Sullivan and Eugène Dillon
Gels 2024, 10(5), 289; https://doi.org/10.3390/gels10050289 - 24 Apr 2024
Viewed by 275
Abstract
Copper-chelated chitosan microgels were investigated as an immobilized metal affinity chromatography (IMAC) phase for peptide separation. The copper-crosslinked chitosan beads were shown to strongly interact with a range of amino acids, in a wide range of pH and saline conditions. The beads exhibited [...] Read more.
Copper-chelated chitosan microgels were investigated as an immobilized metal affinity chromatography (IMAC) phase for peptide separation. The copper-crosslinked chitosan beads were shown to strongly interact with a range of amino acids, in a wide range of pH and saline conditions. The beads exhibited an affinity that seemed to depend on the isoelectric point of the amino acid, with the extent of uptake increasing with decreasing isoelectric point. This selective interaction with anionic amino acids resulted in a significant relative enrichment of the supernatant solution in cationic amino acids. The beads were then studied as a novel fractionation system for complex milk hydrolysates. The copper chitosan beads selectively removed larger peptides from the hydrolysate aqueous solution, yielding a solution relatively enriched in medium and smaller peptides, which was characterized both quantitatively and qualitatively by size exclusion chromatography (SEC). Liquid chromatography–mass spectrometry (LCMS) work provided comprehensive data on a peptide sequence level and showed that a depletion of the anionic peptides by the beads resulted in a relative enrichment of the cationic peptides in the supernatant solution. It could be concluded that after fractionation a dramatic relative enrichment in respect to small- and medium-sized cationic peptides in the solution, characteristics that have been linked to bioactivities, such as anti-microbial and cell-penetrating properties. The results demonstrate the use of the chitosan copper gel bead system in lab scale fractionation of complex hydrolysate mixtures, with the potential to enhance milk hydrolysate bioactivity. Full article
(This article belongs to the Special Issue Gels in Separation Science)
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16 pages, 3042 KiB  
Article
Magnetic Polypyrrole-Gelatin-Barium Ferrite Cryogel as an Adsorbent for Chromium (VI) Removal
by Konstantin A. Milakin, Oumayma Taboubi, Jiřina Hromádková and Patrycja Bober
Gels 2023, 9(10), 840; https://doi.org/10.3390/gels9100840 - 23 Oct 2023
Cited by 1 | Viewed by 907
Abstract
Polypyrrole-gelatin aerogels, containing magnetic barium ferrite (BaFe) particles, (PPy-G-BaFe) were synthesized by oxidative cryopolymerization and used as adsorbents for the removal of Cr(VI) from aqueous media. The removal was performed at pH 4, which was shown to be the optimal value, due to [...] Read more.
Polypyrrole-gelatin aerogels, containing magnetic barium ferrite (BaFe) particles, (PPy-G-BaFe) were synthesized by oxidative cryopolymerization and used as adsorbents for the removal of Cr(VI) from aqueous media. The removal was performed at pH 4, which was shown to be the optimal value, due to HCrO4− being the dominant species in these conditions and its more favorable adsorption and reduction compared to CrO42−, present at pH > 4. It was found that the presence of magnetic BaFe particles had no effect on the adsorption performance of PPy aerogels in terms of capacity and kinetics, which was attributed to its relatively low content in the composite. After the adsorption, the presence of chromium in the composites was confirmed by EDX and its electrostatic interaction with the adsorbent was pointed at by vibrational spectroscopy, corresponding to the accepted adsorption mechanism. The adsorption kinetics followed the pseudo-second-order model pointing at chemisorption being the rate-limiting step. The adsorption isotherm data was best fitting with the Temkin model. The maximum adsorption capacity, calculated using the Langmuir model, was 255.8 mg g−1 (the maximum experimental value was 161.6 mg g−1). Additionally, the possibility of Cr(VI) adsorption in the presence of Cl−, Br−, NO3− and SO42− as interfering ions was shown. Full article
(This article belongs to the Special Issue Gels in Separation Science)
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18 pages, 3693 KiB  
Article
Exploration of Reactive Black 5 Dye Desorption from Composite Hydrogel Beads—Adsorbent Reusability, Kinetic and Equilibrium Isotherms
by Cristina-Gabriela Grigoraș, Andrei-Ionuț Simion and Lidia Favier
Gels 2023, 9(4), 299; https://doi.org/10.3390/gels9040299 - 03 Apr 2023
Cited by 2 | Viewed by 1250
Abstract
A low-cost adsorbent was prepared by using cherry stones powder and chitosan and used to retain Reactive Black 5 dye from aqueous solution. Then, the spent material was submitted to a regeneration process. Five different eluents (water, sodium hydroxide, hydrochloric acid, sodium chloride [...] Read more.
A low-cost adsorbent was prepared by using cherry stones powder and chitosan and used to retain Reactive Black 5 dye from aqueous solution. Then, the spent material was submitted to a regeneration process. Five different eluents (water, sodium hydroxide, hydrochloric acid, sodium chloride and ethanol) were tested. Among them, sodium hydroxide was selected for an advanced investigation. Values of three working conditions, namely the eluent volume, its concentration and the desorption temperature, were optimized by Response Surface Methodology-Box–Behnken Design. In the established settings (NaOH volume: 30 mL, NaOH concentration: 1.5 M, working temperature: 40 °C), three successive cycles of adsorption/desorption were conducted. The analysis performed by Scanning Electron Microscopy and by Fourier Transform Infrared Spectroscopy revealed the evolution of the adsorbent throughout the dye elution from the material. Pseudo-second-order kinetic model and Freundlich equilibrium isotherm were able to accurately describe the desorption process. Based on the acquired results, our outcomes sustain the suitability of the synthesized material as dye adsorbent and the possibility of efficaciously recycling and reusing it. Full article
(This article belongs to the Special Issue Gels in Separation Science)
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