Adsorption of benzoic acid on [alpha]-alumina and [gamma]-boehmite
- Technical Univ. of Denmark, Lyngby (Denmark). Dept. of Geology and Geotechnical Engineering
- Univ. of Bergen (Norway). Dept. of Chemistry
The adsorption of benzoic acid (BzCOOH) on [alpha]-alumina ([alpha]-Al[sub 2]O[sub 3]) and [gamma]-boehmite ([gamma]-AlOOH) from the aqueous phase has been studied. The adsorption experiments were carried out in 0 and 0.1 M NaCl solutions, with pH adjusted to 4 or 6. For both [alpha]-alumina and [gamma]-boehmite, increasing ionic strength decreases the maximum adsorption. Increasing the pH to 6 at the same ionic strength also reduces the maximum adsorption markedly. This suggests that both the anion and the corresponding acid participate in the adsorption process. The results show that benzoic acid has a greater affinity for [alpha]-alumina than for [gamma]-boehmite. Under the same experimental conditions (0.1 M NaCl, pH 4) the maximum adsorption capacities are 5.0 and 1.5 [mu]mol/m[sup 2] for [alpha]-alumina and [gamma]-boehmite, respectively. This difference in adsorption capacities is probably due to the mineralogical difference. These results illustrate the importance of knowing the mineralogical composition of the solid phase.
- OSTI ID:
- 6959103
- Journal Information:
- Journal of Colloid and Interface Science; (United States), Journal Name: Journal of Colloid and Interface Science; (United States) Vol. 166:1; ISSN 0021-9797; ISSN JCISA5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
ADSORPTION
ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM HYDROXIDES
ALUMINIUM OXIDES
BENZOIC ACID
CARBOXYLIC ACIDS
CHALCOGENIDES
CHLORIDES
CHLORINE COMPOUNDS
CRYSTAL STRUCTURE
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXIDES
MINERALOGY
MONOCARBOXYLIC ACIDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PH VALUE
POTENTIALS
SODIUM CHLORIDES
SODIUM COMPOUNDS
SORPTION
SORPTIVE PROPERTIES
SURFACE AREA
SURFACE POTENTIAL
SURFACE PROPERTIES