Fluoride sorption by montmorillonite and kaolinite

Journal Article · Tue Mar 01 04:00:00 EST 1988 · Soil Sci.; (United States)

OSTI ID:6247998

Bar-Yosef, B; Afik, I; Rosenberg, R

The authors studied fluoride sorption by montmorillonite and kaolinite dominated by either Ca/sup 2 +/ or K/sup +/ as a function of F solution concentration, pH, and solution-to-clay ratio. Within an F concentration rate of 0 to 180 ..mu..M and at pHs between 4 and 9, F concentration in the solution of the studied suspensions was governed by adsorption. Adsorption decreased with increasing pH values and was negligible at pH > 8.5 A competitive Langmuir model simulated satisfactorily F retention by the adsorbents under the studied experimental conditions. The maximum adsorption capacity parameter was greater for kaolinite than for montmorillonite and greater for Ca-dominated clays than for K-clays. The affinity of the F species to the surface was maximum in K-kaolinite and minimal in Ca-montmorillonite.

• Research Organization: Volcani Center, Bet Dagan (Israel)
• OSTI ID: 6247998
• Journal Information: Soil Sci.; (United States), Journal Name: Soil Sci.; (United States) Vol. 145:3; ISSN SOSCA
• Country of Publication: United States
• Language: English

Related Subjects

510200* -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ADSORPTION
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
CALCIUM COMPOUNDS
CATIONS
CHARGED PARTICLES
CHEMISTRY
CLAYS
ECOLOGICAL CONCENTRATION
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
IONS
KAOLINITE
MATERIALS
MATHEMATICAL MODELS
MINERALS
MONTMORILLONITE
OXYGEN COMPOUNDS
PH VALUE
POTASSIUM COMPOUNDS
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
SOIL CHEMISTRY
SOILS
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES