Tris(2,2′-bipyridine)ruthenium(II)-clays as adsorbents for phenol and chlorinated phenols from aqueous solution

Tomohiko Okada, Takao Morita, Makoto Ogawa*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)


The adsorptive properties of tris(2,2′-bipyridine)ruthenium (II)-clay intercalation compounds, which were synthesized through cation exchange reactions from synthetic saponite (Sumecton SA), synthetic fluoro-tetrasilicic mica and montmorillonite (Kunipia F) for phenols were investigated. The adsorption isotherms of phenols for the tris(2,2′-bipyridine)ruthenium(II)-clays from aqueous solutions followed Langmuir type, indicating strong adsorbate-adsorbent interactions. The basal spacings of the tris(2,2′-bipyridine)ruthenium(II)-clays did not change through the adsorption of phenols. This means that the adsorbed phenols existed in the interlayer nanopore created by the tris(2,2′-bipyridine)ruthenium(II) in the interlayer space of the tris(2,2′-bipyridine)ruthenium(II)-clays. The adsorbed amounts of phenols varied depending upon the nature of clays. One of the factors responsible for the variation in the adsorbed amounts is the layer charge density of smectites. Relatively low-layer charge density of saponite led to relatively large pore volume in the interlayer space. The adsorbed amounts of 2,4-dichlorophenol for the tris(2,2′-bipyridine)ruthenium(II)-saponite and the tris(2,2′-bipyridine)ruthenium(II)-montmorillonite were the largest among three phenols. It is thought that the interactions between tris(2,2′-bipyridine)ruthenium(II) cation and phenols played an important role in the adsorption of these phenols.

Original languageEnglish
Pages (from-to)45-53
Number of pages9
JournalApplied Clay Science
Issue number1
Publication statusPublished - 2005 Feb


  • Adsorption
  • Chlorinated phenols
  • Montmorillonite
  • Organoclays
  • Phenol
  • Synthetic fluoro-tetrasilicic mica
  • Synthetic saponite
  • Tris(2,2′-bipyridine)ruthenium(II)

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geology


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