Chemisorption of Benzene on Cu-Montmorillonite as Characterized by FTIR and ¹³C MAS NMR

Abstract

Abstract--Sorption of benzene onto Cu-montmorillonite was characterized by Fourier transform infrared (FTIR) spectroscopy and ~3C magic angle spinning nuclear magnetic resonance (MAS NMR). Under anhydrous conditions, chemisorption of benzene in the interlameUar region of Cu-montmorillonite led to the formation of a dark red surface complex that exhibited a vibrational spectrum similar to that of doped poly-p-phenylene. When the benzene sorption reaction was carried out under high relative humidity conditions, polymerization of benzene did not occur. The FTIR spectrum of the surface complex formed under wet conditions exhibited vibrational bands that could not be assigned to those of the parent benzene molecule or to those of previously observed chemisorbed Type I or Type II complexes. ~3C MAS NMR spectra of ~3C-enriched benzene sorbed onto Cu-montmoritlonite powder showed the presence of two groups of peaks that could be assigned to aromatic and aliphatic carbon respectively.

Kinetic and thermodynamics of the removal of Zn2+ and Cu2+ from aqueous solution by sulphate and phosphate-modified Bentonite clay

“…This is collaborated in this study by the small hypochromic shifts in the range of 13-18 cm −1 which is typical of physisorption. However, for the spectra of phosphate-modified Bentonite we observed basically hyperchromic shifts which might indicate that phosphate anion was chemisorbed onto the Bentonite clay mineral surface to become part of the surface [40,41]. It is known that aluminum (Al)-containing minerals have high affinity for phosphate anion due to the presence of Al-OH and Al-H 2 O functional groups on the mineral surface.…”

Chemical characterization and infrared spectroscopy of soil organic matter from two southern brazilian soils

“…There are no such difficulties with diffuse reflectance FTIR (DRIFT) spectroscopy, which can be conducted with bulk samples, and represents a much more rapid and practical IR technique (Baes & Bloom, 1989;Niemeyer et al, 1992). This technique finds its principal application in studies on HS surface reactions and simple organic compounds with soil minerals (Hinedi et al, 1993;Capriel, 1997;Kaiser et al, 1997). Capriel et al (1995) proposed an index obtained by DRIFT spectroscopy to evaluate the SOM hydrophobicity.…”

Sorption properties of light hydrocarbon-contaminated clay under defined conditions

“…There are many publications about adsorption studies of polar organic and volatile organic compounds; some of them used clay minerals as adsorbents (Hinedi et al 1993;Goss 1994Goss , 1996Donahue et al 1999;Morrisey and Grismer 1999). However, only a few studies focus on gasoline sorption and even less on gasoline sorption on clays (e.g.…”