School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, PR China.
School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, PR China.
Chemosphere. 2016 Feb;144:583-90. doi: 10.1016/j.chemosphere.2015.09.038. Epub 2015 Sep 21.
Surfactant-enhanced remediation (SER) has been widely applied in decontaminating PAH-polluted soil. Most researches focus on evaluating washing efficiency without considering pollutants' mutual interaction. This study aims to investigate cosolubilization effect between phenanthrene (Phe) and pyrene (Pyr) in nonionic surfactant Triton X-100 (TX100) solution on their codesorption performance from soil. Cosolubilization experiment showed that, when cosolubilized, solubility of Phe and Pyr in TX100 increased by 15.38% and 18.19%, respectively, as quantified by the deviation ratio of molar solubilization ratio in single and binary solute solubilization systems. The synergism may be due to the enlarged micelle volume caused by PAHs solubilized in the shell region of the micelle. The cosolubilization effect was further observed in the soil washing process. The strengthened TX100 solubilization capacity towards Phe and Pyr could increase the two PAHs' codesorption efficiency from soil, accompanied by synergistic extent of 6-15%. However, synergism in codesorption was weaker than that observed in the cosolubilization system, which may be related to surfactant loss to soil and PAH partition into soil organic matter and the sorbed surfactants. The improved remediation performance during codesorption of mixed PAHs implies the significance of combining PAHs' mutual interaction into evaluating SER, which may reduce the surfactant washing concentration and save remediation cost.
表面活性剂强化修复（SER）已广泛应用于去除多环芳烃（PAH）污染土壤。大多数研究都集中在评估洗涤效率上，而没有考虑污染物之间的相互作用。本研究旨在研究非离子表面活性剂 Triton X-100（TX100）溶液中菲（Phe）和芘（Pyr）的共增溶效应对它们从土壤中编码吸附性能的影响。共增溶实验表明，当共增溶时，Phe 和 Pyr 在 TX100 中的溶解度分别增加了 15.38%和 18.19%，这可以通过单一组分和二元溶质增溶体系中摩尔增溶比的偏差比来定量。协同作用可能是由于 PAHs 溶解在胶束壳区导致胶束体积增大。这种共增溶效应在土壤洗涤过程中也得到了观察。增强的 TX100 对 Phe 和 Pyr 的增溶能力可以提高这两种 PAHs 从土壤中的编码吸附效率，协同作用程度为 6-15%。然而，编码吸附中的协同作用弱于共增溶体系中的协同作用，这可能与表面活性剂向土壤的损失以及 PAH 分配到土壤有机质和吸附的表面活性剂有关。在混合 PAHs 的编码吸附过程中修复性能的提高意味着将 PAHs 之间的相互作用结合到 SER 评价中的重要性，这可能会降低表面活性剂的洗涤浓度并节省修复成本。
