Green Gels—Design, Optimization and Applications in Water Depollution

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

Deadline for manuscript submissions: 20 June 2025 | Viewed by 537

Special Issue Editor


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Guest Editor
Department of Food and Chemical Engineering, Faculty of Engineering, “Vasile Alecsandri” University of Bacău, Calea Mărășești 157, 600115 Bacău, Romania
Interests: adsorbent materials preparation; characterization; gels formulation; water pollutants adsorption; food waste valorization; bioactive compounds extraction
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Special Issue Information

Dear Colleagues,

The intimate connection between water and human health is highly responsible for the substantial interest given to the treatment and preservation of water sources, as their contamination is all the more continuously increasing. Thus, this Special Issue endeavors to publish new approaches addressing the challenge of offering viable solutions for water pollution mitigation.

In the search of new possibilities for water depollution, gels constitute a promising alternative. Already known for their notable ability to retain both organic and inorganic noxious compounds, they are also remarkable due to the fact that they can be obtained from different raw materials through a wide variety of methods.

Authors are invited to submit research articles, review papers and case studies directed toward the design of gels (aerogels, hydrogels, composite gels etc.) by using environmentally friendly formulations. Highlights on the application of green gels for removing persistent pollutants (heavy metals, dyes, pesticides etc.) from water are expected. Recent advances obtained in process optimization (ranging from gel preparation to water purification) with a focus on reducing the consumption of resources, time and energy are also welcome.

Dr. Cristina-Gabriela Grigoraș
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 2100 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

  • gel formulation
  • tailored design
  • water contaminants
  • eco-friendly water remediation
  • wastewater treatment optimization

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Published Papers (1 paper)

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Research

22 pages, 4845 KiB  
Article
Batch Adsorption of Orange II Dye on a New Green Hydrogel—Study on Working Parameters and Process Enhancement
by Andrei-Ionuț Simion, Cristina-Gabriela Grigoraș and Lidia Favier
Gels 2025, 11(1), 79; https://doi.org/10.3390/gels11010079 - 20 Jan 2025
Viewed by 421
Abstract
A new green hydrogel consisting of cherry stone (CS) powder and sodium alginate (SA) was synthesized through physical crosslinking. The product had a mean diameter of 3.95 mm, a moisture content of 92.28%, a bulk density of 0.58 g/cm3, and a [...] Read more.
A new green hydrogel consisting of cherry stone (CS) powder and sodium alginate (SA) was synthesized through physical crosslinking. The product had a mean diameter of 3.95 mm, a moisture content of 92.28%, a bulk density of 0.58 g/cm3, and a swelling ratio of 45.10%. The analyses of its morphological structure and functional groups by scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR) showed the successful entrapping of the CS in the SA polymeric matrix. The viability of the prepared hydrogel as adsorbent was tested towards Orange II (OII) anionic dye. The influence of the pH, adsorbent amount, contact time, and initial dye concentration was evaluated. Then, the impact of three accelerating factors (stirring speed, ultrasound exposure duration, and temperature) on the OII retention was investigated. The highest recorded removal efficiency and adsorption capacity were 82.20% and 6.84 mg/g, respectively. The adsorption followed Elovich and pseudo-second-order kinetics, was adequately described by Freundlich and Khan isotherms, and can be defined as spontaneous, endothermic, and random. The experiments confirmed that the obtained hydrogel can be used acceptably for at least two consecutive cycles, sustaining its effectiveness in water decontamination. Full article
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