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| Effects of highly water-soluble β-cyclodextrins derivative on the inclusion and elution of naphthylamine |
| YANG Cheng-jian1, LI Chao2, CHEN Xing-du1, ZHANG Lu1, ZHENG Zhi1, ZHOU Chen1, JIANG Xin1 |
1. College of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China;
2. School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China |
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Abstract Three highly water-soluble amino acids derived from β-cyclodextrins (β-CD), i.e., glutamic acid-β-cyclodextrin (GluCD), glycine-β-cyclodextrin (GlyCD) and cholamine-β-cyclodextrin (ChoCD), were synthesized and were examined for their capacity for inclusion of naphthylamine in aqueous solution and elution removal of naphthylamine in soil at low concentration. The results showed that GluCD, GlyCD and ChoCD had higher inclusion capacity than β-CD, and the inclusion capacity decreased as follow:GluCD > ChoCD > GlyCD > β-CD. GluCD had the highest inclusion constant 270.7L/moL, which was 4.5times higher than that of β-CD. Amino acids derived from β-CD demonstrated a high elution efficiency for naphthylamine in soil even at low concentrations (1.0g/L), and elution efficiency of GluCD, ChoCD and GlyCD were achived as 88%、94% and 98%, respectively, which was proportionate to their inclusion capacity for naphthylamine in aqueous solution. Moreover, the adsorption of cyclodextrin on soil was also a key factor affecting the elution process.
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Received: 12 April 2016
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