Simultaneous elution of polycyclic aromatic hydrocarbons and heavy metalsfrom contaminated soil by two amino acids derived from β-cyclodextrins
Chengjian Yang , Qingru Zeng , Yunzhong Wang , Bohan Liao , Jian Sun , Hui Shi , Xingdou Chen
DOI:
Received January 23, 2010,Revised May 29, 2010, Accepted , Available online
Volume 22,2010,Pages 1910-1915
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Two highly water-soluble amino acids, which derived from -CDs, i.e., glutamic acid- -cyclodextrin (GluCD) and ethylene-diamine-
-cyclodextrin (EDCD), were synthesized and were examined for their e ect 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 Cd2+ from soil. GluCD
resulted in the highest elution e ciency 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 e ect on the Cd2+ removal due to di erent 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.
