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Editorial Board Members’ Collection Series: "Chemical Reactions of Clay Minerals...
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Editorial Board Members’ Collection Series: "Chemical Reactions of Clay Minerals and Their Utilization"

A special issue of Minerals (ISSN 2075-163X). This special issue belongs to the section "Clays and Engineered Mineral Materials".

Deadline for manuscript submissions: closed (25 August 2023) | Viewed by 2335

Special Issue Editors

Dr. Gianvito Scaringi

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Guest Editor
Institute of Hydrogeology, Engeneering Geology and Applied Geophysics, Charles University, Albertov 6, 128 43 Prague, Czech Republic
Interests: thermomechanical and chemomechanical coupling in clays; natural and engineered clay slopes; landslides
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Hongfei Cheng

E-Mail Website
Guest Editor
School of Earth Science and Resources, Chang’an University, Xi’an 710054, China
Interests: mineralogy; applied clay science; environmental science; soil science
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Jinwook Kim

E-Mail Website
Guest Editor
Department of Earth System Sciences, Yonsei University, Seoul 03722, Republic of Korea
Interests: microbe-mineral interaction; extreme einvrionments; Fe-liberation, smectite-to-illite reaction; diagenesis; petrophysical properties
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Over three decades ago, Polish academician and professor Leszek Stoch delivered a conference talk—which shares its title with this Special Issue—in which he summarized the possible industrial uses of clays that exploit the various chemical processes they enable. Now, it seems the right time to look back and realize how much progress has been made, and how much is yet to come, in the use of clay minerals and their reactions in a variety of applications in many fields, from the chemical industry to engineering, and from medicine to biology. Clays are extraordinary in that their complex composition and layered structure, with weak bonds between minerals and strong bonds within them, grant them a great reactivity, which is further enhanced by their low crystallinity and large specific surface area.
In this Special Issue, we welcome contributions from all fields of science and technology, including reviews and original works, demonstrating the key role of reactions of clay minerals in practical applications, and delineating both mature and exciting new directions of research and development.

Dr. Gianvito Scaringi
Prof. Dr. Hongfei Cheng
Prof. Dr. Jinwook Kim
Guest Editors

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. Minerals 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 2400 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

  • clay minerals
  • chemical reactions
  • clay chemistry
  • chemo-mechanical coupling
  • industrial uses

Published Papers (2 papers)

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Research

19 pages, 5495 KiB  
Article
Raw Smectite from the Guarapuava–Parana–Brasil Saturated with Copper Ions and Its Properties
by Maria Lidia M. Rocha, Nayara Balaba, Silvia Jaerger, Julia O. Primo, Dienifer F. L. Horsth, Patrícia Appelt, Daiane Meneguzzi, Mário A. A. Cunha and Fauze J. Anaissi
Minerals 2023, 13(6), 785; https://doi.org/10.3390/min13060785 - 8 Jun 2023
Cited by 1 | Viewed by 1030
Abstract
In this study, raw smectite (Sm), from the Guarapuava–Parana–Brasil region, was saturated with copper ions (Cu-Sm) by ion exchange and the samples Sm and Cu-Sm were used in crystal violet (CV) adsorption and applied as an antimicrobial and antifungal hybrid pigment. Samples (Sm [...] Read more.
In this study, raw smectite (Sm), from the Guarapuava–Parana–Brasil region, was saturated with copper ions (Cu-Sm) by ion exchange and the samples Sm and Cu-Sm were used in crystal violet (CV) adsorption and applied as an antimicrobial and antifungal hybrid pigment. Samples (Sm and Cu-Sm) were used to remove crystal violet (CV) dye from aqueous media, simulating wastewater. Samples after use as adsorbents were characterized and named smectite/adsorbed dye (Sm/Dye) and copper smectite/adsorbed dye (Cu-Sm/Dye); and they were applied as hybrid pigments with antimicrobial action. The Sm and Cu-Sm were characterized by X-ray diffractometry (XRD), energy dispersive X-ray fluorescence (EDXRF), vibrational spectroscopy (FTIR), Zeta potential (ζ), scanning electron microscopy (SEM), and colorimetry (CIE L*a*b*), enabling the identification of the presence of intercalated copper ions and on the smectite surface. The adsorption assays were carried out to evaluate the effects of initial dye concentration and contact time. Tests for application as a hybrid pigment showed good compatibility with commercial white paint being applied on plaster blocks and later photoaging and chemical stability tests were performed in acid and basic environments, both were discussed by colorimetry (CIE L*a*b*), thus being able to relate it to the color variation (∆E). The samples (Sm, Cu-Sm, Sm/Dye, and Cu-Sm/Dye) were dispersed in white paint at 10% and 20% (% w/w) to evaluate the ability to inhibit different microorganisms. The modification with copper ions promoted an increase in the adsorptive capacity relative to the raw smectite and provided antibacterial and antifungal action to the hybrid pigment against Escherichia coli, Staphylococcus aureus, Listeria monocytogenes, and Candida albicans. The Cu-Sm and Cu-Sm/Dye samples showed excellent results against all studied microorganisms and reveal successful materials that can be used in environments that require microbiological protection. Full article
(This article belongs to the Special Issue Editorial Board Members’ Collection Series: "Chemical Reactions of Clay Minerals and Their Utilization")
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16 pages, 4332 KiB  
Article
Preparation, Structural Characterization and Evaluation of Some Dynamic and Rheological Properties of a New Type of Clay Containing Mastic Material, Clay-Mastic
by Ahmet Gürses and Tahsin Barkın Barın
Minerals 2023, 13(5), 705; https://doi.org/10.3390/min13050705 - 22 May 2023
Cited by 1 | Viewed by 880
Abstract
This study focused on the preparation, structural characterization and evaluation of some dynamic and rheological properties of a new type of mastic material, clay-mastic, which consists of bituminous binders mixed with mineral fillers. For this purpose, mastic samples were prepared by mixing conventional [...] Read more.
This study focused on the preparation, structural characterization and evaluation of some dynamic and rheological properties of a new type of mastic material, clay-mastic, which consists of bituminous binders mixed with mineral fillers. For this purpose, mastic samples were prepared by mixing conventional bitumen (50/70) with organo-montmorillonite (OMMT) in various proportions. X-ray powder diffraction (XRD) spectra and scanning electron microscope (SEM) and high-resolution transmission electron microscope (HRTEM) images of raw clay (MMT), organo-clay (OMMT) and raw bitumen with the prepared mastics were taken, and the changes in the crystallographic properties of the clay and its dispersion characteristics in the bitumen matrix as well as the changes in the morphological properties of the mastic samples were investigated comparatively. In addition, penetration, softening point, flash point, dynamic viscosity, dynamic shear rheometer (DSR) and Fraass breaking point tests were carried out together with those of base bitumen in order to evaluate the properties of the prepared mastic samples in terms of dynamics and rheology. A comparison of the images of raw clay and organo-clay indicated delamination based on surface modification in clay layers in those belonging to organo-clay, and diffractograms of prepared mastic samples showed that the characteristic smectite peak of Montmorillonite shifted to the left gradually with an increasing clay ratio. This shows that due to the successful lyophilic modification on the clay surface, the effective intercalated and even exfoliated dispersion of the clay layers in the bitumen matrix can occur. The penetration viscosity number (PVN) values, defined as a function of penetration and dynamic viscosity, and the penetration index (PI) values, defined as a function of penetration and softening point, were found to be within a well-accepted thermal stability range for all of the prepared mastic samples. For this reason, it was concluded that the sensitivity of the samples to temperature decreased with the addition of organo-clay, thus providing applicability in a wider temperature range. The Fraass breaking point and dynamic viscosity values of the prepared mastic samples decreased and increased, respectively, with an increasing clay ratio, meaning that the addition of organo-clay lead to an increase in the crack resistance of the samples at low temperatures and a decrease in their permeability. Full article
(This article belongs to the Special Issue Editorial Board Members’ Collection Series: "Chemical Reactions of Clay Minerals and Their Utilization")
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