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Zeolites and Related Materials: Synthesis, Properties and Applications
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Zeolites and Related Materials: Synthesis, Properties and Applications

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Porous Materials".

Deadline for manuscript submissions: closed (20 November 2023) | Viewed by 1874

Special Issue Editor

Dr. Agnieszka Gładysz-Płaska

E-Mail Website
Guest Editor
Faculty of Chemistry, Maria Curie-Sklodowska University in Lublin, Lublin, Poland
Interests: clay minerals; zeolites; adsorption; uranium; toxic ions
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The study of zeolites and related materials is an important area of research with diverse applications in catalysis, adsorption, and environmental remediation. The development of new materials with enhanced properties and novel functionalities holds promise for addressing some of the most pressing challenges facing society today. Zeolites are a class of porous materials with a well-defined crystalline structure, consisting of SiO4 and AlO4 tetrahedra. They are widely used as catalysts, adsorbents, and ion exchangers due to their unique properties such as large surface area, uniform pore size, and selective adsorption of molecules.

In recent years, the development of new zeolites and related materials has been a topic of intense research. One area of focus has been the synthesis of hierarchical zeolites, which possess additional mesoporous features that enhance their catalytic and adsorption properties. Another area of interest has been the development of novel zeolite-based materials, such as zeolitic imidazolate frameworks (ZIFs), which are characterized by their tunable pore sizes and chemical functionalities.

Furthermore, researchers have been exploring the use of zeolites and related materials in environmental applications, such as water treatment and air purification. Zeolites have been shown to be effective in removing heavy metals, organic pollutants, and radioactive isotopes from contaminated water, while ZIFs have shown promise in capturing carbon dioxide from industrial emissions.

Original articles, communications, as well as review papers that describe the current state of the art in the proposed field of research are of great interest.

Dr. Agnieszka Gładysz-Płaska
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. Materials is an international peer-reviewed open access semimonthly 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

  • zeolites
  • porous materials
  • mesoporous
  • catalytic
  • adsorption

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Published Papers (1 paper)

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Research

23 pages, 32864 KiB  
Article
Microwave-Assisted Hydrothermal Synthesis of Pure-Phase Sodalite (>99 wt.%) in Suspension: Methodology Design and Verification
by Kamila Rouchalová, Dana Rouchalová, Vladimír Čablík and Dalibor Matýsek
Materials 2024, 17(1), 269; https://doi.org/10.3390/ma17010269 - 4 Jan 2024
Viewed by 1458
Abstract
Despite numerous studies focused on the hydrothermal (HT) synthesis of fly ash zeolites (FAZs), this method still has many limitations, the main of which is the low yield of zeolites. Hydrothermally synthesized zeolites are typically multiphase and exhibit low purity, which limits their [...] Read more.
Despite numerous studies focused on the hydrothermal (HT) synthesis of fly ash zeolites (FAZs), this method still has many limitations, the main of which is the low yield of zeolites. Hydrothermally synthesized zeolites are typically multiphase and exhibit low purity, which limits their applicability. Pure-phase zeolites have been primarily prepared from filtrates after alkaline mineralization of fly ashes, not directly in suspension. In addition, the published methodologies have not been tested in a wider set of samples, and thus their reproducibility is not confirmed. The aim of the study is to propose a reproducible methodology that overcomes the mentioned limitations. The influence of the Si/Al ratio (1.3:1–1:2), the type and concentration of the activator (2/4 M NaOH/KOH/LiOH), the reagent (30% LiCl), the duration (24–168 h), and the temperature (50–180 °C) of the synthesis phases were studied. The sequence of the synthesis phases was also optimized, depending on the type of heat transfer. The fly ashes were analyzed by wavelength-dispersive X-ray fluorescence (WD XRF), flame atomic absorption spectrometry (F-AAS), and X-ray diffraction (XRD). The energy intensity of the synthesis was reduced through the application of unique microwave digestion technology. Both microwave and combined (microwave and convection) syntheses were conducted. FAZs were identified and quantified by XRD analysis. This study presents a three-stage (TS) hydrothermal synthesis of pure-phase sodalite in suspension. Sodalite (>99 wt.%) was prepared from nine fly ashes under the following conditions: I. microwave phase: 120 °C, 150 min, solid-to-liquid ratio (S/L) 1:5, Si/Al ratio 1:1.5, and 4 M NaOH; II. convection phase: 120 °C, 24 h, S/L 1:40, and the addition of 30 mL of 30% LiCl; and III. crystallization: 70 °C for 24 h. The formation of rhombododecahedral sodalite crystals was confirmed by scanning electron microscope (SEM) images. Full article
(This article belongs to the Special Issue Zeolites and Related Materials: Synthesis, Properties and Applications)
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