AN FT-IR SPECTROSCOPIC INVESTIGATION OF THE ADSORPTION OF BENZIDINE BY SEPIOLITE FROM ESKISEHIR (TURKEY)


AKYUZ S., AKYUZ T., DAVIES J.

JOURNAL OF MOLECULAR STRUCTURE, vol.293, pp.279-282, 1993 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 293
  • Publication Date: 1993
  • Doi Number: 10.1016/0022-2860(93)80067-6
  • Title of Journal : JOURNAL OF MOLECULAR STRUCTURE
  • Page Numbers: pp.279-282

Abstract

The adsorption of benzidine by sepiolite obtained from Eskisehir (Turkey) has been studied by Fourier-transform infrared spectroscopy. A deep green colouration results on reaction of benzidine and sepiolite. In the IR spectrum of benzidine treated sepiolite nu(C-N+) vibrational modes of the uni- and di-positive radical cations are observed in addition to vibrational modes of coordinated benzidine. Spectroscopic results indicate that the principle adsorption mechanism for benzidine is coordination to surface hydroxyls from nitrogen lone pairs and to a relatively small extent, formation of radical cations. No physical sorbed species have been detected. It must be noted that the adsorption of benzidine affected the hydroxyl group vibrations of sepiolite.