关键词: 电动力学, 苯酚, 土壤修复, 粘土

Abstract: Using the electrokinetic technique to remediate phenol contaminated soil, the adsorption characteristics, the best extraction agent and extraction conditions of phenol in clay were studied. The migration characteristics of phenol under the conditions of different pH, different moisture contents, different electric-field intensities and different additives were discussed. It was found that the adsorption behavior of phenol followed Freundlich isotherm and the maximum adsorption was 362 mg·kg^-1. Using chloroform as an extractant, with ultrasonic time of 20 min plus temperature shock time of 30 min to extract phenol from soil, the extraction rate could reach 94.3%. Phenol migrated to the anode and enriched within 0-6 cm from the anode in the soil electrodynamics process. The best migration effect of phenol was achieved under the conditions of pH=8.16, moisture content of 40%, electric-field intensity of 2 V·cm^-1, along with the additions of 0.1 mol·L^-1 NaOH solution and 0.05 mol·L^-1 LAS solution into the anode and the cathode, respectively. The enrichment rates of phenol reached 139% and 133.7%, respectively, at the distances of 0 cm and 6 cm away from the anode.

Key words: electrokinetic, phenol, soil remediation, clay