Hydration and dehydration of water of bentonite: A solid-state 1H magic-angle spinning NMR study

Hailong Wang, Toshimichi Shibue, Hideo Komine

Research output: Contribution to journalArticlepeer-review

Abstract

Molecular-level interactions of interlayer water near the montmorillonite surfaces were investigated on commercial bentonite using solid-state 1H magic-angle spinning NMR spectroscopy. It was observed that when the water content was higher than about 3 wt%, the chemical shift of samples increases as the increase in water content, while it decreases when the water content was lower than about 3 wt% with the increase of water content. Dehydration experiments at low water content and theoretical calculation showed that there might be two types of interaction in the interlayer space of montmorillonite: the water-water interaction and cation-water interaction. Water-water interaction was dominant at relatively high water content and cation-water interaction was dominant at relatively low water contents. The water-water interaction formed loosely bound water and the water-cation interaction formed tightly bound water near the montmorillonite surfaces.

Original languageEnglish
Article number110796
JournalChemical Physics
Volume536
DOIs
Publication statusPublished - 2020 Aug 1

Keywords

  • Bentonite
  • Cation-water cluster
  • Clay
  • Dehydration
  • Density functional theory
  • Hydration
  • Montmorillonite
  • Nuclear magnetic resonance

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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