Two-Step Adsorption of PtCl62- Complexes at a Charged Langmuir Monolayer: Role of Hydration and Ion Correlations

Ahmet Uysal*, William Rock, Baofu Qiao, Wei Bu, Binhua Lin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Anion exchange at positively charged interfaces plays an important role in a variety of physical and chemical processes. However, the molecular-scale details of these processes, especially with heavy and large anionic complexes, are not well-understood. We studied the adsorption of PtCl62- anionic complexes to floating DPTAP monolayers in the presence of excess Cl- as a function of the bulk chlorometalate concentration. This system aims to simulate the industrial conditions for heavy metal separations with solvent extraction. In situ X-ray scattering and fluorescence measurements, which are element and depth sensitive, show that the chlorometalate ions only adsorb in the diffuse layer at lower concentrations, while they adsorb predominantly in the Stern layer at higher concentrations. The response of DPTAP molecules to the adsorbed ions is determined independently by grazing incidence X-ray diffraction and supports this picture. Molecular dynamics simulations further elucidate the nanoscale structure of the interfacial complexes. The results suggest that ion hydration and ion-ion correlations play a key role in the competitive adsorption process.

Original languageEnglish (US)
Pages (from-to)25377-25383
Number of pages7
JournalJournal of Physical Chemistry C
Volume121
Issue number45
DOIs
StatePublished - Nov 16 2017

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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