Effect of sodium dodecyl sulfate on naphthalene degradation by thermally activated persulfate
ZHANG Hui1, ZHANG Cheng-wu1, FU Yu-feng1, YAO Yu1, GUO Chao2, QIN Chuan-yu1
1. Key Laboratory of Groundwater Resources and Environment, Ministry of Education, National and Local Joint Engineering Laboratory for Petrochemical Contaminated Site Control and Remediation Technology, Jilin Provincial Key Laboratory of Water Resources and Environment, Jilin University, Changchun 130021, China; 2. CECEP DADI Environmental Remediation Co., Ltd., Beijing 100162, China
Abstract：Surfactant-enhanced soil washing processes typically produce various washing solutions that contain hydrophobic organic compounds and surfactants. How to effectively remove the target pollutants while minimizing surfactants degradation for reuse has become a major concern for the remediation project. Therefore, the effect of sodium dodecyl sulfate(SDS), an anionic surfactant commonly used in soil washing, on degradation of naphthalene by thermally activated persulfate(PS) was studied. The results showed that the degradation of naphthalene was inhibited by the protection of SDS micelles, but the free radicals still preferentially degraded naphthalene in the mixtures of naphthalene and SDS. When the amount of SDS was 5times of the critical micelle concentration (5CMC), the degradation rate constant of naphthalene (knap= 0.0108min-1) was 18times that of the SDS (kSDS= 0.0006min-1). At 10CMC, the morphology of micelle changed from the spherical at 5CMC to the vesicle, which greatly enhanced the protection of naphthalene by the micelle, thus reducing the preferential degradation of naphthalene in the system. In addition, the effect of PS dosage on the preferential degradability of naphthalene was investigated, and the path and mechanism of naphthalene degradation were also analyzed. The response surface methodology was used to establish a prediction model and the reaction conditions were optimized correspondingly, such model can guide the dosage of reagent in the process of treating actual soil washing solutions according to the desired effect.
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