Mechanisms of safranin O interaction with 1:1 layered clay minerals. Issue 12 (13th August 2021)

• Record Type: Journal Article
• Authors: Hebert, Jessica; Wang, Lijuan; Wang, Xisen; Baker, Jessica; Rivera, Nick; Troedel, Michael; Li, Zhaohui
• Is Part Of: Separation science and technology. Volume 56:Issue 12(2021)
• Page Start: 1985
• Page End: 1995
• Publication Date: 2021-08-13
• Subjects: Cationic dye -- halloysite -- kaolinite -- mechanism -- removal -- safranin O; Separation (Technology) -- Periodicals; 660.284205
• DOI: 10.1080/01496395.2020.1806325
• Languages: English
• ISSNs: 0149-6395

Abstract

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.