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Minerals
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Organo-Clays: Preparation, Characterization and Applications
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Organo-Clays: Preparation, Characterization and Applications

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

Deadline for manuscript submissions: 30 September 2025 | Viewed by 1772

Special Issue Editors

Prof. Dr. Francisco Rolando Valenzuela-Díaz

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Guest Editor
Departamento de Engenharia Metalúrgica e de Materiais da Escola Politécnica, Universidade de São Paulo, Sao Paulo 05508-030, Brazil
Interests: clay science and technology
Special Issues, Collections and Topics in MDPI journals
Dr. Antonio Kieling

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Guest Editor
Department of Mechanical Engineering, State University of Amazonas, Manaus 69850-020, Brazil
Interests: clay science and technology; composite materials
Dr. Jose Costa de Macedo Neto

E-Mail Website
Guest Editor
Departamento de Engenharia de Materiais, Universidade do Estado do Amazonas (UEA), Manaus 69850-020, Brazil
Interests: polymer nanocomposites and metals

Special Issue Information

Dear Colleagues,

An enormous number of organo-clay complexes have been and are being studied. This is because clays are made up of very small elementary particles which have an anisometric morphology, chemically interesting surfaces and generally have the ability to exchange cations or anions, allowing for the intercalation or incorporation of organic substances. The most studied types of clays have been kaolin, halloysite, other tubular clays, bentonite and anionic clays like lamellar double hydroxides. This Special Issue will focus on the preparation, characterization and application of organo-clays that include both the consolidated applications of organo-clays, such as organophilic clays in the drilling of oil wells, in the paint industry and in cosmetics and toiletries, as well as in more modern applications such as the incorporation of organic substances in water treatment, controlled drug release, fertilizers, herbicides, etc., nanofillers in polymers’ nanocomposites, and also the emerging study of organo-synthetic clays.

Prof. Dr. Francisco Rolando Valenzuela-Díaz
Dr. Antonio Kieling
Dr. Jose Costa de Macedo Neto
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

  • organo-clays
  • the preparation of organo-clays
  • the characterization of organo-clays
  • the uses of organo-clays
  • organo-bentonite
  • organo-kaolin

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Published Papers (2 papers)

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Research

23 pages, 2930 KiB  
Article
Assessment of Nontoxic Surfactant-Modified Kaolinite for Potential Application as an Adsorbent for Mycotoxins
by Milica Ožegović, Marija Marković, Aleksandra Daković, Milena Obradović, Danijela Smiljanić, George E. Rottinghaus, Vesna Jaćević, Ljubiša Ignjatović and Ivana Sredović Ignjatović
Minerals 2025, 15(7), 731; https://doi.org/10.3390/min15070731 - 12 Jul 2025
Viewed by 238
Abstract
In this study, natural kaolin was modified with hexadecyltrimethylammonium bromide (HDTMA-Br) at two levels corresponding to 50% and 90% of its cation exchange capacity. The resulting materials, designated as HKR-50 and HKR-90, were used as adsorbents for the mycotoxins ochratoxin A (OCHRA) and [...] Read more.
In this study, natural kaolin was modified with hexadecyltrimethylammonium bromide (HDTMA-Br) at two levels corresponding to 50% and 90% of its cation exchange capacity. The resulting materials, designated as HKR-50 and HKR-90, were used as adsorbents for the mycotoxins ochratoxin A (OCHRA) and zearalenone (ZEN). The characterization of the HKRs with several methods (X-ray diffraction, DRIFT spectroscopy, thermal analysis (DTA/TG), SEM, zeta potential measurements, and the determination of the point of zero charge and textural properties) confirmed the presence of surfactant ions on the organokaolinites’ surfaces. The adsorption of ZEN and OCHRA by HKRs followed nonlinear adsorption isotherms, suggesting a complex adsorption mechanism. The adsorption capacities of ZEN and OCHRA were similar for HKR-50 and HKR-90 at pH 3, with higher adsorption observed for ZEN (~13.0 mg/g for HKR-50 and HKR-90 for ZEN and ~8.0 mg/g for HKR-50 and HKR-90 for OCHRA). At pH 7, the adsorption of ZEN and OCHRA was lower than at pH 3, especially for OCHRA, but slightly increased with increased amounts of surfactant on the kaolinite surface (8.5 mg/g for HKR-50 and 10.8 mg/g for HKR-90 for ZEN and 2.6 mg/g for HKR-50 and 4.1 mg/g for HKR-90 for OCHRA). Special attention was paid to the safety assessment of the natural kaolin and HKR-90, and toxicological tests confirmed the safety of both materials, as no adverse effects were observed in rats. Full article
(This article belongs to the Special Issue Organo-Clays: Preparation, Characterization and Applications)
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16 pages, 4165 KiB  
Article
Sorption Properties of Bentonite-Based Organoclays with Amphoteric and Nonionic Surfactants in Relation to Polycyclic Aromatic Hydrocarbons
by Tamara Dudnikova, Marina Burachevskaya, Tatyana Minkina, Saglara Mandzhieva, Inna Zamulina, Leonid Perelomov and Maria Gertsen
Minerals 2024, 14(11), 1132; https://doi.org/10.3390/min14111132 - 8 Nov 2024
Cited by 1 | Viewed by 1046
Abstract
Polycyclic aromatic hydrocarbons (PAHs) are a major scientific challenge due to their profound impact on public and environmental health. Therefore, studying ways to detoxify PAHs is important. In this research, the adsorption ability of bentonite modified with five surfactants, including amphoteric (cocoamphodiacetate disodium [...] Read more.
Polycyclic aromatic hydrocarbons (PAHs) are a major scientific challenge due to their profound impact on public and environmental health. Therefore, studying ways to detoxify PAHs is important. In this research, the adsorption ability of bentonite modified with five surfactants, including amphoteric (cocoamphodiacetate disodium and sodium cocoiminodipropionate) and nonionic (lauramine oxide, cocamide diethanolamine, and alkylpolyglucoside) substances for the adsorption of high-molecular benzo(a)pyrene and low-molecular naphthalene from the PAH group was studied. The bentonite and bentonite-based organoclays were characterized using X-ray diffraction and Fourier transform infrared spectroscopy. The results showed that the maximum adsorption of benzo(a)pyrene by organoclays increased compared with the initial mineral. The adsorption of benzo(a)pyrene is higher than that of naphthalene. The adsorption process of benzo(a)pyrene by bentonite and organoclays is predominantly monolayer, as it is better described by the Langmuir model (R2 0.77–0.98), while naphthalene is predominantly multilayer, described by the Freundlich model (R2 0.86–0.96). According to the effectiveness of sorption capacities of organoclays—including the degree of sorption, Langmuir and Freundlich constants, the value of maximum adsorption, Gibbs free energy, and the index of favorability of the adsorption process—the most effective modification was found. For the adsorption of benzo(a)pyrene the best was cocoamphodiacetate disodium, and for naphthalene it was sodium cocoiminodipropionate. Full article
(This article belongs to the Special Issue Organo-Clays: Preparation, Characterization and Applications)
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