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Separation Science and Technology Volume 56, 2021 - Issue 12
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Adsorption

Mechanisms of safranin O interaction with 1:1 layered clay minerals

Jessica Heberta Department of Geosciences, University of Wisconsin – Parkside, Kenosha, Wisconsin, USA
,
Lijuan Wangb School of Material Sciences and Technology, China University of Geosciences, Beijing, China
,
Xisen Wangc Department of Chemistry, University of Wisconsin – Parkside, Kenosha, Wisconsin, USACorrespondence[email protected]
,
Jessica Bakera Department of Geosciences, University of Wisconsin – Parkside, Kenosha, Wisconsin, USA
,
Nick Riveraa Department of Geosciences, University of Wisconsin – Parkside, Kenosha, Wisconsin, USA
,
Michael Troedela Department of Geosciences, University of Wisconsin – Parkside, Kenosha, Wisconsin, USA
&
Zhaohui Lia Department of Geosciences, University of Wisconsin – Parkside, Kenosha, Wisconsin, USACorrespondence[email protected]
ORCID Iconhttps://orcid.org/0000-0003-1762-9676
ORCID Icon show all
Pages 1985-1995 | Received 03 May 2020, Accepted 01 Aug 2020, Published online: 13 Aug 2020
 
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ABSTRACT

Using Earth materials for the removal of environmental contaminants attracted great attention. In this study, the mechanism of safranin O (SO) removal by 1:1 layered clay minerals was investigated. The specific surface area and cation exchange capacity of the minerals played a key role, while solution pH and ionic strength had less influences on SO removal. The sorption of counterion Cl– on halloysite nano clay (HNC) at high loading levels resulted in bilayer SO formation on HNC surfaces. Lack of Cl– sorption on kaolinite (KAO) suggested monolayer SO formation on KAO surfaces. These speculations were confirmed by molecular dynamic simulation.

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