Adsorption of low molecular weight halocarbons by montmorillonite
- Univ. of California, Los Angeles (USA)
Montmorillonite clay from Clay Spur, WY, was found to adsorb several low molecular weight, hydrophobic halocarbons from aqueous solution at sub-parts-per-million levels. The halocarbons studied were trichloroethylene, tetrachloroethylene, hexachloroethane, and dibromochloropropane. When the montmorillonite was treated with sodium citrate-bicarbonate-dithionite (CBD), it adsorbed higher levels of halocarbons than the untreated clay. In addition, the CBD-treated clay exhibited a maximum in halocarbon adsorption around pH 4, while untreated clay showed little variation in adsorption over the pH range 2-10. Adsorption of trichloroethylene was inhibited by low concentrations of sodium chloride (0.01 M or greater) in solution. Aging the CBD-treated clay in water decreased its capacity to adsorb trichloroethylene. Desorption studies showed that the sorption of tetrachloroethylene to CBD-treated clay is an irreversible process when compared to sorption by fumed silica. The ability of montmorillonite to adsorb halocarbons and the instability of the clay in water are postulated to involve changes in the oxide surface coating on the clay.
- OSTI ID:
- 5254882
- Journal Information:
- Environmental Science and Technology; (USA), Vol. 22:5; ISSN 0013-936X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
HALOGENATED ALIPHATIC HYDROCARBONS
ADSORPTION
MONTMORILLONITE
SORPTIVE PROPERTIES
ENVIRONMENTAL TRANSPORT
PH VALUE
POLLUTANTS
WASTE DISPOSAL
WYOMING
CLAYS
FEDERAL REGION VIII
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MANAGEMENT
MASS TRANSFER
MATERIALS
NORTH AMERICA
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
SORPTION
SURFACE PROPERTIES
USA
WASTE MANAGEMENT
580000* - Geosciences