Influence of pH and of the Interactions Involved in Etheramine Removal in Kaolinite: Insights about Adsorption Mechanism

As the adsorption process involves interactions between molecules of the adsorbate and the surface of the adsorbent material, theoretical studies are developed with the aim of elucidating the mechanism. In this work, the influence of pH on adsorption of etheramine in kaolinite was investigated. The...

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Bibliographic Details
Published in:Journal of physical chemistry. C 2013-10, Vol.117 (42), p.21788-21794
Main Authors: Magriotis, Zuy Maria, de Sales, Priscila Ferreira, Ramalho, Teodorico Castro, Rocha, Marcus Vinícius Juliaci, Leal, Paulo Vitor Brandão
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Physics
Solid surfaces and solid-solid interfaces
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
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Summary:As the adsorption process involves interactions between molecules of the adsorbate and the surface of the adsorbent material, theoretical studies are developed with the aim of elucidating the mechanism. In this work, the influence of pH on adsorption of etheramine in kaolinite was investigated. The results showed that adsorption was most efficient at pH 10, which was attributed to the equilibrium of the etheramine molecules between ionic and molecular forms creating an ionic–molecular complex that promotes adsorption. Theoretical calculations confirmed these results and showed that the ionic–molecular dimer is the most stable structure among the possible dimers (ionic–ionic, molecular–molecular, and ionic–molecular).
ISSN:1932-7447
1932-7455
DOI:10.1021/jp4054764