Extraction of Heavy Metals from Solid Material by Supercritical CO2

Chemical Research in Chinese Universities ›› 2011, Vol. 27 ›› Issue (5): 850-853.

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Extraction of Heavy Metals from Solid Material by Supercritical CO₂

YU Hong-quan¹, ZHANG Yu¹, WU Bin², YANG Nan-nan², YANG Xiao-ning^2* and LIU Xing-ji^1*

1. Department of Neruosurgery, the First Hospital of Jilin University, Changchun 130021, P. R. China;
2. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing 210009, P. R. China

Received:2011-05-27 Revised:2011-08-31 Online:2011-09-25 Published:2011-09-06
Contact: LIU Xing-ji;LIU Xing-ji E-mail:xjl9831@163.com;Yangxia@njut.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(Nos.20776066, 20976079).

Abstract

Abstract: Extraction of heavy metal ions from solid matrix by means of an incorporation of chelating agents with supercritical carbon dioxide(scCO2) was investigated experimentally. Four commercially available chelating agents, diethylammonium diethyldithiocarbamate(Et2NH2DDC), trifluoroacetylacetone(TFA), hexafluoroacetylacetone(HFA) and thenoyltrifluoroacetone(TTA) were tested. The extraction experiments were conducted at 50 °C and 1.39×107― 2.80×107 Pa. According to the experimental results, for the extraction of Cu2+, all the chelating agents investigated here are effective. For other metal ions, such as Pb2+, Ni2+ and Cd2+, Et2NH2DDC exhibited a better extraction result, while other chelating agents were less effective. This investigation is expected to provide a tentative evaluation on the scCO2-based metal extraction from solid media.

Key words: Supercritical CO2, Chelating agent, Heavy metal ion, Extraction

YU Hong-quan, ZHANG Yu, WU Bin, YANG Nan-nan, YANG Xiao-ning* and LIU Xing-ji*. Extraction of Heavy Metals from Solid Material by Supercritical CO₂[J]. Chemical Research in Chinese Universities, 2011, 27(5): 850-853.

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Extraction of Heavy Metals from Solid Material by Supercritical CO₂

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