2 results
Search Results
Now showing 1 - 2 of 2
Publication Metadata only A Vibrational Spectroscopic Study of the Adsorption of 4 4 Bipyridiyl by Smectite Group Clay Minerals From Anatolia Turkey(Kluwer Academic Publishers, 1993-06) Davies, J. Eric D.; AKYÜZ, SEVİM; AKYÜZ, ZEKİ TANIL; 1012The adsorption of 4,4′-bipyridyl by natural sepiolite and smectite group clay minerals (bentonite, hectorite and saponite) from Anatolia (Turkey) has been studied using vibrational spectroscopy. Investigation of Fourier-transform infrared and Fourier-transform Raman spectra of adsorbed 4,4′-bipyridyl indicate the presence of chemisorbed species. However, any evidence for the generation of anionic species on the surface of the phyllosilicates has not been detected. It is proposed that the adsorbed bipyridyl molecules on sepiolite are centrosymmetric and H-bonded to the surface hydroxyls through both the nitrogen lone pairs as bidentate ligands. The adsorbed bipyridyl molecules on the smectite group clays are coordinated to exchangeable cations both directly and also indirectly through water as monodentate ligands. XRD patterns of the clays studied are also recorded.Publication Metadata only Adsorption of 2 2 Bipyridyl onto Sepiolite Attapulgite and Smectite Group Clay Minerals from Anatolia FT IR and FT Raman Spectra of Surface and Intercalated Species(Kluwer Academic Publishers, 1994-06) Davies, J. Eric D.; AKYÜZ, SEVİM; AKYÜZ, ZEKİ TANIL; 10127The adsorption of 2,2′-bipyridyl by natural sepiolite, attapulgite, hectorite, saponite and natural and ion exchanged (Mn, Fe, Co, Ni, Cu, Zn or Sn) bentonites has been investigated by FT-IR and FT-Raman spectroscopy. Spectroscopic results indicate that most of the adsorbed molecules are coordinated to either exchangeable cations (in the case of smectite group clays) or Lewis acidic centres (in the case of sepiolite and attapulgite) as bidentate ligands. The formation of monoanionic surface species has also been detected, to a relatively small extent. No physisorbed surface species has been observed. XRD patterns and UV-visible spectra of the samples are also recorded for additional information.