Cyclic carbonate-sodium smectite intercalates

Will P. Gates, Uzma Shaheen, Terence W. Turney, Antonio F. Patti

Research output: Contribution to journalArticleResearchpeer-review

8 Citations (Scopus)

Abstract

Five-membered cyclic organic carbonates (COC) are of interest for their ability to modify the surface properties of smectites and enhance the hydraulic resistance of bentonites to saline leachates. The mechanism of interaction of glycerol carbonate (GC) and several other hydroxyl containing cyclic organic carbonates (generally having progressively greater molecular masses) with sodium montmorillonite (Na+-Mt) was studied using powder X-ray diffraction and infrared spectroscopy. The 001 reflection for GC/Na+-Mt intercalates varied with the amount COC added, and the measured d001 value increased from 1.29 nm to as large as 2.22 nm at equal-mass coverage of the COC to Na+-Mt. In general, when intercalated, the cyclic carbonyl (CO) stretch and the fundamental hydroxyl (O-H) stretch bands of COC derivatives were red-shifted with respect to these bands for neat COC, indicating strong ion-dipole interaction of the carbonyl group with interlayer Na+, and H-bonding of the OH group with both interlayer water and Mt surfaces. A stable and highly ordered intercalate was produced at a 1:1 mass loading with Mt in which about 6 GC molecules per unit cell (~7 molecules per Na+ ion) replaced most of the interlayer water.

Original languageEnglish
Pages (from-to)94-101
Number of pages8
JournalApplied Clay Science
Volume124-125
DOIs
Publication statusPublished - 1 May 2016

Keywords

  • Crystalline swelling
  • Glycerol carbonate
  • Interlayer structure
  • Polar aprotic solvents
  • Salinity barriers

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