Journal of South China University of Technology (Natural Science Edition) ›› 2005, Vol. 33 ›› Issue (6): 59-62.

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Supercritical CO2 Complexing Extraction of Heavy Metals from Pogostemon Cabfin Benth

Dang Zhi  Zhu Zhi-xin  Wen Zhen  Li Qiong   

  1. College of Chemical Science,South China Univ.of Tech.,Guangzhou 510640,Guangdong,China
  • Received:2004-09-17 Online:2005-06-25 Published:2005-06-25
  • Contact: 党志(1962-)，男，教授，博士生导师，主要从事重金属和有机污染物污染方面的研究 E-mail:chzdang@scut.edu.cn
  • About author:党志(1962-)，男，教授，博士生导师，主要从事重金属和有机污染物污染方面的研究
  • Supported by:

    教育部博士点基金资助项目(20020561026)；广东省自然科学基金资助项目(036556)

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Abstract:

Sodium diethyldithiocarbamate(NaDDTC)was used as the complexing agent for the removal of heavymetals in Pogostemon cablin Benth,a Chinese herbal medicine,by supercritical carbon dioxide complexing extrac-tion.The extraction conditions including the pressure,the temperature and the amount of NaDDTC were then opti-mized by orthogonal experiments.The experimental results show that,in the best extraction conditions,that is,70℃of extraction temperature,25 MPa of extraction pressure and 15.79% (mass fraction)of the complexing a-gent,the extraction rates of Cu,Pb and Zn are respectively up to 55.2% ,59.2% and 53.3%.The proposed method can thus be used as a new approach to the removal of the heavy metals in Chinese herbal medicines.

Key words: supercritical complexing extraction, Pogostemon cablin Benth, heavy metal