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Simultaneous elution of polycyclic aromatic hydrocarbons and heavy metals
from contaminated soil by two amino acids derived from β-cyclodextrins 总被引:1,自引:0,他引:1
Chengjian Yang Qingru Zeng Yunzhong Wang Bohan Liao Jian Sun Hui Shi Xingdou Chen 《环境科学学报(英文版)》2010,22(12):1910-1915
Two highly water-soluble amino acids,which derived from β-CDs,i.e.,glutamic acid-β-cyclodextrin (GluCD) and ethylene-diamineβ-cyclodextrin (EDCD),were synthesized and were examined for their effect on solubilization of anthracene (ANT),complexation of cadmium (Cd2+),and elution removal of ANT and Cd2+ in soil.The results showed that GluCD and EDCD were powerful complexant for ANT and Cd2+.In the presence of 10 g/L GluCD and EDCD,the solubilization of ANT increased by 47.04 and 23.85 times compared to the control,respectively.GluCD resulted in approximately 90% complexation of Cd2+ while 70% complexation was observed for EDCD.Simultaneously,GluCD and EDCD could greatly enhance the elution removal of ANT and Cd 2+ from soil.GluCD resulted in the highest elution efficiency of ANT and Cd2+.With the addition of 10 g/L GluCD,53.5% of ANT and 85.6% of Cd2+ were eluted,respectively.The ANT had a negligible effect on the Cd2+ removal due to different complexing sites of ANT and Cd2+,while Cd2+ enhanced the ANT removal under the addition of GluCD because Cd2+ neutralized the-COOH group of GluCD.Adversely,the removal of ANT was decreased with Cd2+ under the addition of EDCD,this was due to the fact that Cd2+ enhanced the polarity of EDCD molecule and inhibited the complexation between ANT and EDCD.The study suggested that GluCD could be preferred and be successfully applied to remediation of heavy metals or organic compounds in contaminated soil. 相似文献
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采用内酯型槐糖脂(SL50)修复石油污染土壤。通过单因子实验与正交实验,考察了槐糖脂溶液质量浓度、振荡时间、反应体系初始pH、NaCl加入量以及固液比(土壤质量与表面活性剂溶液体积之比)对污染土壤石油烃洗脱率的影响。单因子模型回归分析结果表明,参数变量均符合二次拟合模型,槐糖脂溶液质量浓度、反应体系初始pH以及NaCl加入量的二次模型拟合效果较好。正交实验结果表明,槐糖脂溶液质量浓度和反应体系初始pH是该实验的敏感性因子,最优洗脱条件为槐糖脂溶液质量浓度40 mg/L、反应体系初始pH 9、NaCl加入量6%(w)。 相似文献