کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4413218 1307669 2009 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Enhanced washing of HCB contaminated soils by methyl-β-cyclodextrin combined with ethanol
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Enhanced washing of HCB contaminated soils by methyl-β-cyclodextrin combined with ethanol
چکیده انگلیسی
The present study investigates the combined effect of cyclodextrin (CD) and cosolvent on the washing of hexachlorobenzene (HCB) from contaminated soils. Methyl-β-cyclodextrin (MCD), ethanol, a natural soil (NS) and kaolin, were selected. Batch equilibrium experiments were conducted to quantify the performance of HCB solubilization and recovery by varied MCD/ethanol systems. Results show that with 30% or 50% of added ethanol, considerable synergistic effect on HCB solubilization was achieved in MCD/ethanol system. The formation of ternary MCD/ethanol/HCB complex is most likely responsible for the synergy. Similar synergy was further evidenced in the washing of HCB from kaolin and NS by MCD/ethanol system containing 30% ethanol. Unexpectedly, the combination of MCD and 50% ethanol exhibited negligible synergy of HCB recovery. The failure in promotion is probably due to a nonextractable fraction of HCB for NS, or a nearly complete HCB recovery from kaolin by 50% ethanol alone. Results also indicate that the synergistic effect of the MCD/ethanol system will be significantly hindered by a higher organic content and longer aging of the soil. Generally, our study suggests that compared to conventional CD or cosolvent-aided soil remediation, the combined use of CD and cosolvents would offer great superiority to the contaminant recovery.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 75, Issue 6, May 2009, Pages 759-764
نویسندگان
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