Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Investigation on the co-modification process of montmorillonite by anionic and cationic surfactants
AbstractTo study how anionic surfactant sodium dodecyl sulfonate (SDS) and cationic surfactant cetyltrimethylammonium chloride (CTAC) enter the interlayer spaces of montmorillonite, montmorillonite, CTAC and SDS were exchanged consecutively and simultaneously. Three parameters were investigated: reaction times, surfactants contents and addition sequences. The results of XRD, thermal analysis and sulfur analysis stated that SDS could not intercalate into montmorillonite interlayer space alone. However, it can enter the interlayer space of montmorillonite in the presence of CTAC. The addition sequences of cationic and anionic surfactants affect the d-value and thermal stability of anionic-cationic montmorillonite. The data obtained from elemental analysis clarified the steps of this multistep reaction sequence and a mechanistic scheme has been proposed: a portion of cationic surfactants intercalate into the interlayer spaces of montmorillonite by cation exchange firstly, and then the anionic surfactant enter the interlayer spaces of montmorillonite by the synergistic effect with cationic surfactants. Molecular simulation indicated the arrangement of cationic and anionic surfactants intercalated into montmorillonite interlayer space.
Graphical abstract
HighlightsThe modification process of cation-anion type montmorillonite was studied.Mechanism: Cations first entered montmorillonite layer, then ion-pairs entered.Addition order of cations and anions had influence on the intercalation.
Investigation on the co-modification process of montmorillonite by anionic and cationic surfactants
AbstractTo study how anionic surfactant sodium dodecyl sulfonate (SDS) and cationic surfactant cetyltrimethylammonium chloride (CTAC) enter the interlayer spaces of montmorillonite, montmorillonite, CTAC and SDS were exchanged consecutively and simultaneously. Three parameters were investigated: reaction times, surfactants contents and addition sequences. The results of XRD, thermal analysis and sulfur analysis stated that SDS could not intercalate into montmorillonite interlayer space alone. However, it can enter the interlayer space of montmorillonite in the presence of CTAC. The addition sequences of cationic and anionic surfactants affect the d-value and thermal stability of anionic-cationic montmorillonite. The data obtained from elemental analysis clarified the steps of this multistep reaction sequence and a mechanistic scheme has been proposed: a portion of cationic surfactants intercalate into the interlayer spaces of montmorillonite by cation exchange firstly, and then the anionic surfactant enter the interlayer spaces of montmorillonite by the synergistic effect with cationic surfactants. Molecular simulation indicated the arrangement of cationic and anionic surfactants intercalated into montmorillonite interlayer space.
Graphical abstract
HighlightsThe modification process of cation-anion type montmorillonite was studied.Mechanism: Cations first entered montmorillonite layer, then ion-pairs entered.Addition order of cations and anions had influence on the intercalation.
Investigation on the co-modification process of montmorillonite by anionic and cationic surfactants
Fu, Meng (Autor:in) / Zhang, Zepeng (Autor:in) / Wu, Limei (Autor:in) / Zhuang, Guanzheng (Autor:in) / Zhang, Shuo (Autor:in) / Yuan, Jiangyan (Autor:in) / Liao, Libing (Autor:in)
Applied Clay Science ; 132-133 ; 694-701
26.08.2016
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Investigation on the co-modification process of montmorillonite by anionic and cationic surfactants
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