Electrokinetic movement of multiple chlorobenzenes in contaminated soilsin the presence of β-cyclodextrin
YUAN Song-hu , WAN Jin-zhong , LU Xiao-hua
DOI:
Received October 01, 2006,Revised December 30, 2006, Accepted , Available online
Volume 19,2007,Pages 968-976
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This study investigated the electrokinetic (EK) behavior of multiple chlorobenzenes, including 1,2,3,4-tetrachlorobenzene (TeCB),
1,2,4,5-tetrachlorobenzene (i-TeCB), and 1,2,3-trichlorobenzene (TCB) in contaminated clayed soils. The e ect of β-cyclodextrin (β -
CD) on the EK removal of the chlorobenzenes was studied. The largest removal was obtained when Na2CO3/NaHCO3 bu er was
used as anodic purging solution without β-CD. The removal e ciencies were related to the aqueous solubilities of chlorobenzenes.
With the same cumulative electroosmotic flow, greater solubility led to higher removal e ciency. The addition of β-CD inhibited the
EK removal effciency of all chlorobenzenes. The inhibition increased with the increase of β-CD concentration. With the same β-CD
concentration, the inhibition increased with the rise of electric potential. It was found that the inclusion compounds between β-CD and
chlorobenzenzes were less soluble than chlorobenzenes. The formation of the less soluble inclusion compounds reduced the aqueous
solubility of chlorobenzenes and led to the partial immobilization of the chlorobenzenes that desorbed from soil. It was feasible to use
the EK technology to remove chlorobenzenes in contaminated soils using water as the anodic flushing solution. The addition of β-CD
was not recommended for the EK removal of chlorobenzenes.
