Chemisorption of catechol on gibbsite, boehmite, and noncrystalline alumina surfaces

Journal Article · Wed Jun 01 04:00:00 EDT 1988 · Environ. Sci. Technol.; (United States)

DOI:https://doi.org/10.1021/es00171a014· OSTI ID:6607761

McBride, M B; Wesselink, L G

The mechanism of bonding of catechol and related phenolic compounds on aluminum oxides was elucidated from sorption behavior in the presence of competing adsorbates and the nature of the infrared spectra of the surface-bound molecules. The surfaces demonstrated a high degree of selectivity toward catechol, adsorbing the molecule in the presence of a large excess of chloride. Phosphate competed effectively with catechol for sorption sites while acetate did not. Dispersive and Fourier transform infrared spectroscopy verified that catechol bound on the aluminum oxide surfaces was chemically perturbed in much the same manner as catechol chelated by Al/sup 3 +/, suggesting that the dominant sorption process involved the formation of a 1:1 bidentate complex with surface Al. The mechanisms of bonding was similar for all the aluminum oxides, but the dominant crystal surfaces of the crystalline oxides were unreactive toward catechol, and adsorption was attributed to -AlOH groups situated on edge faces. As a result, the noncrystalline oxide was more reactive per unit of surface area than the crystalline minerals boehmite and gibbsite.

• Research Organization: Cornell Univ., Ithaca, NY (USA)
• OSTI ID: 6607761
• Journal Information: Environ. Sci. Technol.; (United States), Journal Name: Environ. Sci. Technol.; (United States) Vol. 22:6; ISSN ESTHA
• Country of Publication: United States
• Language: English

Related Subjects

510200* -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ACETATES
ADSORPTION
ALUMINIUM COMPOUNDS
ALUMINIUM HYDROXIDES
ALUMINIUM OXIDES
AROMATICS
CARBOXYLIC ACID SALTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
CHLORIDES
CHLORINE COMPOUNDS
FOURIER TRANSFORMATION
GIBBSITE
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXIDES
HYDROXY COMPOUNDS
INFRARED SPECTRA
INTEGRAL TRANSFORMATIONS
MINERALS
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHENOLS
PHOSPHATES
PHOSPHORUS COMPOUNDS
SEPARATION PROCESSES
SOILS
SORPTION
SPECTRA
TRANSFORMATIONS