Removal of heavy metals from a Chinese traditional medicine by supercritical CO2 chelating extraction

被引：0
|
作者：
Cui, Hongyou [1 ]
Wang, Tao [1 ]
Guan, Yanfen [1 ]
Liu, Jun [1 ]
Shen, Zhongyao [1 ]
机构：
[1] Dept. of Chem. Eng., Tsinghua Univ., Beijing 100084, China
来源：
Qinghua Daxue Xuebao/Journal of Tsinghua University | 2001年 / 41卷 / 12期
关键词：
Carbon dioxide - Chelation - Complexation - Extraction - Heavy metals - Removal;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
This paper investigates the effects of pressure, temperature and a modifier (ethanol) on CO2 supercritical-chelating extraction of heavy metal ions from a Chinese traditional medicine. The results indicate that the optimal temperature for extraction efficiency differ for the same conditions and increase in the order of Pb, As, and Cu, while the extraction efficiency for Hg decreases as the temperature increases. Increasing the extraction pressure or the modifier concentration in the supercritical CO2, the extraction efficiencies for As, Pb, and Hg do not increase noticeably, while the extraction efficiency for Cu increased markedly. The extraction efficiencies for As, Hg, Cu increase with the extraction time but not for Pb.
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页码：25 / 27
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