Use of Clay Minerals in Adsorption and Photocatalysis Technologies

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

Deadline for manuscript submissions: 25 June 2025 | Viewed by 552

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Academic Unit of Cabo de Santo Agostinho, Federal Rural University of Pernambuco, Cabo de Santo Agostinho 54589-899, Brazil
Interests: engineering; nanomaterials; soil; mineralogy; drug delivery; agriculture; biology; medicine; biotechnology; pharmacology; adsorption; photocatalysis; pigments; plastics; cosmetics; solar cells
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Guest Editor
Academic Unit of Cabo de Santo Agostinho, Federal Rural University of Pernambuco, Cabo de Santo Agostinho 54589-899, Brazil
Interests: engineering; nanomaterials; soil; mineralogy; drug delivery; agriculture; biology; medicine; biotechnology; pharmacology; adsorption; photocatalysis; pigments; plastics; cosmetics; solar cells
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Designing efficient nanomaterials for environmental remediation and the treatment of polluted water has been a major focus of research. Clay minerals are valuable in adsorption and photocatalysis due to their unique properties, including their ion exchange capacity, high surface area, sorption capacity, and surface reactivity. Furthermore, clay minerals can interact with various organic and inorganic compounds, altering their structure, functional groups, and surface charge at different pH levels. These interactions can improve the removal of various pollutants, including heavy metals, dyes, pharmaceuticals, and pesticides. The versatility of clay materials also enables their use in biotechnological applications, such as drug release, antimicrobials, and ensuring the photostability of organic molecules. This Special Issue of Minerals invites papers, including full-length articles, review articles, and short communications, on the topic of the “Use of Clay Minerals in Adsorption and Photocatalysis Technologies”. We welcome studies on recent developments in clay and clay mineral-based materials and invite manuscripts covering a wide range of topics, including, but not limited to, the following:

  • New nanocomposites or hybrids derived from clays and clay minerals;
  • Clay/clay mineral-based materials used in environmental remediation;
  • The use of clays, clay minerals, and their derivatives in adsorption applications;
  • The use of clays, clay minerals, and their derivatives in photocatalytic applications.

Dr. Pollyana Trigueiro
Prof. Dr. Ramón Raudel Peña Garcia
Guest Editors

Manuscript Submission Information

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Keywords

  • clays
  • clay minerals
  • adsorptive materials
  • photocatalytic materials
  • environmental research
  • water treatment
  • nanocomposites

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Published Papers (1 paper)

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Research

25 pages, 13628 KiB  
Article
Mechanochemical Treatments of Commercial Vermiculites
by Celia Marcos, Javier F. Reynes and Pedro Álvarez-Lloret
Minerals 2025, 15(4), 383; https://doi.org/10.3390/min15040383 - 5 Apr 2025
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Abstract
This study investigates the mechanochemical transformation of commercial vermiculites from Uganda and China, processed for 30 minutes (30 min), 8 hours (8 h), and 24 hours (24 h). Structural and textural modifications were analyzed using X-ray diffraction (XRD), thermogravimetric analysis (TGA), BET surface [...] Read more.
This study investigates the mechanochemical transformation of commercial vermiculites from Uganda and China, processed for 30 minutes (30 min), 8 hours (8 h), and 24 hours (24 h). Structural and textural modifications were analyzed using X-ray diffraction (XRD), thermogravimetric analysis (TGA), BET surface area measurements, and scanning electron microscopy (SEM). Characterization via X-ray diffraction (XRD), thermogravimetric analysis (TGA), BET surface area measurements, and scanning electron microscopy (SEM) revealed substantial structural and textural modifications. Crystallinity decreased significantly, from 66.37% to 3.47% in the Ugandan sample, whereas the three mixed-phase Chinese samples exhibited greater structural resilience, with final crystallinity ranging from 3.82% to 6.30%. Mechanochemical treatment induced mineral phase transformations, including hydrobiotite formation in the Ugandan sample and Fe3Si, quartz, moganite, and NaMgH3 in the Chinese samples. Particle size reduced significantly, reaching submicrometric dimensions after 24 h, with C1 showing the smallest mean size (0.39 µm). BET analysis showed an initial increase in specific surface area, peaking at 31.83 m2/g for C1 after 8 h, followed by a decrease due to pore collapse. The optimal treatment time varied by sample, with 30 min maximizing adsorption in C2 and C3, while 8 h was most effective for C1. These findings highlight mechanochemical treatment as a viable method for tuning vermiculite properties for applications in adsorption, catalysis, and composite materials. Full article
(This article belongs to the Special Issue Use of Clay Minerals in Adsorption and Photocatalysis Technologies)
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