Electrokinetic removal of 2,6-dichlorophenol and diuron from kaolinite and humic acid-clay system.
This paper presents the results of a study on the electrokinetic treatment of kaolinite and humic acid kaolinite complexes spiked with 2,6-dichlorophenol or 3-(3,4-dichlorophenyl)-1,1-dimethylurea (diuron). In particular, the attention was paid to the interaction between solid surface and dissolved organics: the effects of contaminant sorption as well as the physicochemical reactions on the efficiency of electrokinetic remediation were investigated. Using a 3V/cm voltage gradient, approximately 90% of diuron was removed from kaolinite after one water pore volume was collected in the cathode reservoir, but much lower efficiency was obtained in the electrokinetic removal of this compound from humic acid-coated kaolinite. The results also showed that partial degradation of the contaminant occurred during electrokinetic treatment of kaolinite clay spiked with 2,6-dichlorophenol: the contamination in the clay could be remediated by the combination of electrokinetic extraction and electrochemical reactions.
Polcaro
Anna Maria
AM
Dipartimento di Ingegneria Chimica e Materiali, Università degli Studi di Cagliari, Piazza d'Armi, 09123 Cagliari, Italy. polcaro@dicm.unica.it
Vacca
Annalisa
A
Mascia
Michele
M
Palmas
Simonetta
S
D000327:Adsorption; D001546:Bentonite / Q000737:chemistry*; D002733:Chlorophenols / Q000737:chemistry; D004237:Diuron / Q000737:chemistry; D004563:Electrochemistry; D015386:Hazardous Substances; D006812:Humic Substances; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D007616:Kaolin / Q000737:chemistry*; D012989:Soil Pollutants / Q000737:chemistry*
D002733:Chlorophenols; D015386:Hazardous Substances; D006812:Humic Substances; D007220:Industrial Waste; D012989:Soil Pollutants; D001546:Bentonite; D007616:Kaolin; D004237:Diuron; C032729:2,6-dichlorophenol