Petitgirard Audrey, Djehiche Mokhtar, Persello Jacques, Fievet Patrick, Fatin-Rouge Nicolas
Université de Franche-Comté - Besançon, Institut UTINAM - UMR CNRS 6213, 16, route de Gray, F-25030 Besançon cedex, France.
Chemosphere. 2009 May;75(6):714-8. doi: 10.1016/j.chemosphere.2009.01.072. Epub 2009 Feb 28.
We studied the possibility to re-use an aqueous solution of methyl-beta-cyclodextrin (bpmCD) in order to decontaminate a soil polluted by phenanthrene and pyrene. The loss of bpmCD in the soil was insignificant. In order to eliminate polycylic aromatic hydrocarbons (PAHs) from the contaminated aqueous solution, on one hand we tested their photodegradation using TiO(2) suspensions. But it was inefficient, because of the stabilisation of PAHs within the cavity of bpmCD. On the other hand, we removed PAHs by liquid-liquid extraction with colza oil. This allowed the regeneration of cyclodextrins, by concentrating the pollutants in the organic phase with a small loss of carrier. Contaminated soils were almost completely de-polluted after 2d of re-circulation, using a 10mM solution of bpmCD. To reduce the amount of bpmCD loss in the oil phase, we set the fraction of colza oil low, by using a micro-emulsion or by impregnating an organic membrane with the oil. We found this last possibility more interesting.
我们研究了重复使用甲基-β-环糊精（bpmCD）水溶液对菲和芘污染土壤进行去污的可能性。bpmCD在土壤中的损失微不足道。为了从受污染的水溶液中去除多环芳烃（PAHs），一方面我们测试了使用TiO(2)悬浮液对其进行光降解。但这效率不高，因为PAHs在bpmCD的空腔内具有稳定性。另一方面，我们通过用菜籽油进行液-液萃取来去除PAHs。这通过将污染物浓缩在有机相中且载体损失较小，实现了环糊精的再生。使用10mM的bpmCD溶液进行2天的再循环后，受污染的土壤几乎完全去污。为了减少bpmCD在油相中的损失量，我们通过使用微乳液或将油浸渍在有机膜中来降低菜籽油的比例。我们发现最后这种可能性更具吸引力。
