p-phenylenediammonium-smectites as adsorbents with colorimetric detection ability for phenols in water

Tomohiko Okada, Makoto Ogawa*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


The ion exchange of p-phenylenediammonium and sodium-smectites (montmorillonite and synthetic saponite) resulted in the formation of p-phenylenediammonium radical cation and its dimer by the electron transfer from p-phenylenediammonium to smectites, as revealed by the color change (from colorless to green) as well as the visible absorption spectra. The p-phenylenediammonium-saponite thus obtained adsorbed phenols from aqueous solutions. The basal spacing of the p-phenylenediammonium-saponite increased upon the uptake of phenols, indicating a change in the microstructure. The uptake of phenols into the p-phenylenediammonium-saponite from aqueous solutions occurred through the formation of indoaniline dyes, as revealed by the color change from green to purple (for phenol) or purple-blue (for 2,4-dichlorophenol) as well as the absorption spectra. On the contrary, phenols were not intercalated into the interlayer space of the p-phenylenediammonium- montmorillonite.

Original languageEnglish
Pages (from-to)1165-1170
Number of pages6
JournalBulletin of the Chemical Society of Japan
Issue number6
Publication statusPublished - 2004

ASJC Scopus subject areas

  • General Chemistry


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