甘氨酸-β-环糊精对菲的增溶、解吸行为研究

为改善β-环糊精的水溶性,将β-环糊精和甘氨酸在碱性条件下用环氧氯丙烷连接起来,得到水溶性极好的甘氨酸-β-环糊精,研究了甘氨酸-β-环糊精对菲的增溶、解吸行为,考察了pH、甘氨酸-β-环糊精初始浓度、温度、不同环糊精类型对菲解吸的影响。结果表明,甘氨酸-β-环糊精对菲的增溶效果显著,其初始质量浓度为30 g/L时,对菲的增溶倍数可以达到近30倍;甘氨酸-β-环糊精对菲的解吸随pH的升高而降低;升高甘氨酸-β-环糊精初始浓度和温度有利于菲的解吸;甘氨酸-β-环糊精对菲的解吸好于α-环糊精和β-环糊精,甘氨酸-β-环糊精对菲污染土壤的解吸符合准二级动力学方程。该静态解吸研究可以为菲污染土壤的修复提供基础信息。

Effect of glycine -β-cyclodextrin on enhanced solubilization and desorption behavior of phenanthrene

High water soluble glycine-β-cyclodextrin was synthesized by β-cyclodextrin and glycine under basic condition with epichlorohydrin used as the cross-linking agent. The effects of obtained glycine-p-cyclodextrin on enhanced soiubilization and desroption behavior of phenanthrene in soil was studied, and the influence factors of phenanthrene desorption, such as pH, initial concentration of g]ycine-β-cyclodextrin, temperature and CD type, were also investigated and described in details. The IR spectra of glycine-β-cyclodextrin showed that the added hydrophilic groups such as amide and carboxy improved the poor solubility of -β-cyclodextrin, and inner hydrophobic structure of β-cyclo-dextrin could accelerate the solution of hydrophobic organic matters. The obtained glycine-β-cyclodextrin presented perfect capacity of phenanthrene solubilization, 30 g/L of glycine-β-cyclodextrin could increase the solubility of phenanthrene by about 30 times. A higher pH resulted in a lower efficiency of phenanthrene desorption in soil, and the phe-nanthrene desorption efficiency increased with increasing temperature and initial glycine-β-cyclodextrin concentration. The data of phenanthrene desorption in soil were well fitted by the pseudo second-order rate equation. This static desorption research provided some fundamental information for the remediation of phenanthrene-contaminated soil.