College of Environmental Science and Engineering, Hunan University, Changsha 410082, China.
Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China.
Int J Environ Res Public Health. 2019 Mar 31;16(7):1155. doi: 10.3390/ijerph16071155.
Soil contamination with petroleum hydrocarbons and heavy metals is a widespread environmental problem. In recent years, cyclodextrin has attracted research interest because of its special hole structure that can form inclusion complexes with certain small molecules. However, the solubility of β-cyclodextrin (β-CD) in water is low and it crystallizes easily, leading to its low utilization in practice. In this experiment, we connected β-CD with glycine under alkaline conditions to prepare glycine-β-cyclodextrin (G-β-CD), which is water soluble, has stronger coordinating ability with heavy metals, and is more suitable for treating oil-contaminated soil. The results show that G-β-CD provides better desorption of petroleum hydrocarbons and heavy metals in soils with low organic matter content (1%) and NaNO₃ of 0.25 mol/L at 70 g/L G-β-CD under mildly acidic (pH 5⁻6) conditions. The results indicate that petroleum hydrocarbons and heavy metals were removed simultaneously by means of pretreatment with G-β-CD, and the results can provide a theoretical basis for remediation of petroleum-contaminated soil.
土壤中石油烃和重金属的污染是一个广泛存在的环境问题。近年来，由于环糊精具有特殊的孔状结构，可以与某些小分子形成包合物，因此引起了研究人员的关注。然而，β-环糊精（β-CD）在水中的溶解度较低，且容易结晶，导致其在实际应用中的利用率较低。在本实验中，我们在碱性条件下将β-CD 与甘氨酸连接，制备了水溶性的甘氨酸-β-环糊精（G-β-CD）。该化合物与重金属的配位能力更强，更适合用于处理受石油污染的土壤。结果表明，在低有机质含量（1%）和 0.25mol/LNaNO₃的条件下，当 G-β-CD 的用量为 70g/L、反应体系的 pH 值为 5-6 时，G-β-CD 对低有机质土壤中石油烃和重金属的解吸效果更好。这表明 G-β-CD 可以通过预处理同时去除石油烃和重金属，为受石油污染土壤的修复提供了理论依据。
