Sulfonation of the interlayer surface of kaolinite

Siegnin, Raissa; Dedzo, Gustave Kenne; Ngameni, Emmanuel

doi:10.1016/j.clay.2022.106570

Cited by 7 publications

(2 citation statements)

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“…For example, kaolinite, as a non-expanding mineral, cannot accommodate significant numbers of organic molecules until the interlayer spaces have expanded with the help of some substances [135]. Since even this property is often lost via the de-intercalation of the modifier, kaolinite becomes an effective adsorbent by grafting the interlayer spaces or introducing charged groups between the layers [136]. In addition to increasing the expansion of the interlayer spaces, the specific interactions of the particular dye can also play an important role.…”

Section: Dye Adsorption On Clay Particle Agglomeratesmentioning

confidence: 99%

“…Although the basal surface of the particles constitutes a significant part of the active surface, the edges of the particles are chemically much more variable, their charge and properties depend on pH and, above all, they open up new possibilities for further chemical modifications. Through a targeted reaction, it is possible to modify the edges of the particles to create particles that have edges with locally hydrophobic properties or with groups with a positive or negative charge [136,[171][172][173]. In addition, the edges can be variably modified while maintaining the original properties of the siloxane surface.…”

Section: Grafted Claysmentioning

confidence: 99%

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Controversial Issues Related to Dye Adsorption on Clay Minerals: A Critical Review

Bujdák

2023

Molecules

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This critical review points out the most serious and problematic issues to be found in the literature on the adsorption of dyes on clay minerals. The introduction draws attention to the fundamental problems, namely the insufficient characterization of adsorbents, the influence of impurities on the adsorption of dyes, and the choice of inappropriate models for the description of the very complex systems that clay minerals and their systems represent. This paper discusses the main processes accompanying adsorption in colloidal systems of clay minerals. The relationship between the stability of the colloidal systems and the adsorption of dye molecules is analyzed. The usual methodological procedures for determining and evaluating the adsorption of dyes are critically reviewed. A brief overview and examples of modified clay minerals and complex systems for the adsorption of organic dyes are summarized. This review is a guide for avoiding some faults in characterizing the adsorption of organic dyes on clay minerals, to improve the procedure for determining adsorption, to evaluate results correctly, and to find an appropriate theoretical interpretation. The main message of this article is a critical analysis of the current state of the research in this field, but at the same time, it is a guide on how to avoid the most common problems and mistakes.

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Section: Dye Adsorption On Clay Particle Agglomeratesmentioning

confidence: 99%