Equilibrium studies of the uptake of aromatic compounds from an aqueous solution by montmorillonite modified with tetraphenylphosphonium and amyltriphenylphosphonium

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1 Citation (Scopus)

Abstract

Montmorillonite (MMT) modified with tetraphenylphosphonium (TPP·MMT) and amyltriphenylphosphonium (AmylTPP·MMT) was shown to adsorb 1,2-dimethoxybenzene (DMB) and 1,3-dinitrobenzene (DNB) from an aqueous solution. The adsorption of DMB could be expressed by Langmuir-type adsorption isotherms. The adsorption of DMB by TPP·MMT and AmylTPP·MMT was spontaneous because the ΔG values in both cases were negative. The uptake of DMB by TPP·MMT and AmylTPP·MMT could be considered a physical adsorption process caused by π-π stacking interactions, because the ΔG values were in the range of -20 to 0 kJ mol-1. The uptake of DNB by TPP·MMT was expressed by the Halsey and Henderson models, which explained the multilayer adsorption.

Original languageEnglish
Pages (from-to)8-12
Number of pages5
JournalJournal of Alloys and Compounds
Volume625
DOIs
Publication statusPublished - 2015 Mar 15

Keywords

  • Equilibrium analyses
  • Montmorillonite
  • Mutual interactions of π electrons
  • Stacking interactions

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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