SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2013, Vol. 21 ›› Issue (3): 227-231.DOI: 10.1016/S1004-9541(13)60472-3

• 分离科学与工程 •    下一篇

Removal of Lead Ions from Ginseng Ethanol Extracts by Dynamic Adsorption in a Fixed-bed Column

刘文芳, 赵之平, 郭轶琼   

  1. School of Chemical Engineering and the Environment, Beijing Institute of Technology, Beijing 100081, China
  • 收稿日期:2011-09-09 修回日期:2012-04-19 出版日期:2013-03-28 发布日期:2013-04-01
  • 通讯作者: ZHAO Zhiping
  • 基金资助:

    Supported by the National Natural Science Foundation of China (20976012, 20806009), and the Specialized Research Fund for the Doctoral Program of Higher Education (20070007055, 20091101110035).

Removal of Lead Ions from Ginseng Ethanol Extracts by Dynamic Adsorption in a Fixed-bed Column

LIU Wenfang, ZHAO Zhiping, GUO Yiqiong   

  1. School of Chemical Engineering and the Environment, Beijing Institute of Technology, Beijing 100081, China
  • Received:2011-09-09 Revised:2012-04-19 Online:2013-03-28 Published:2013-04-01
  • Supported by:

    Supported by the National Natural Science Foundation of China (20976012, 20806009), and the Specialized Research Fund for the Doctoral Program of Higher Education (20070007055, 20091101110035).

摘要: The removal of lead from ginseng ethanol extracts by a fixed-bed column filled with an adsorbent bearing amine and carboxyl groups was investigated. The Pb2+ content was determined by inductively coupled plasma mass spectrometry. When the flowrate increased from 0.12 to 0.34 ml•min-1, the column exhibited a marked increase in percentage of lead removal from 54.9% to 92.3%. Further increase in the flowrate did not bring evident changes to the lead removal, whereas an increase in the temperature could reinforce adsorption further, suggesting that the adsorption process was controlled by external film diffusion below the flowrate of 0.34 ml•min-1, and by the intraparticle pore diffusion of lead ions when the flowrate exceeded it. A low remaining lead amount in extracts such as 0.11 mg•kg-1 (extracts powder) was achieved. The adsorbents also adsorbed effective constituents to some extent. But 88% of constituents adsorbed were taken off using a 70% ethanol aqueous solution.

关键词: ginseng ethanol extracts, lead removal, adsorption, fixed-bed, effective constituent

Abstract: The removal of lead from ginseng ethanol extracts by a fixed-bed column filled with an adsorbent bearing amine and carboxyl groups was investigated. The Pb2+ content was determined by inductively coupled plasma mass spectrometry. When the flowrate increased from 0.12 to 0.34 ml•min-1, the column exhibited a marked increase in percentage of lead removal from 54.9% to 92.3%. Further increase in the flowrate did not bring evident changes to the lead removal, whereas an increase in the temperature could reinforce adsorption further, suggesting that the adsorption process was controlled by external film diffusion below the flowrate of 0.34 ml•min-1, and by the intraparticle pore diffusion of lead ions when the flowrate exceeded it. A low remaining lead amount in extracts such as 0.11 mg•kg-1 (extracts powder) was achieved. The adsorbents also adsorbed effective constituents to some extent. But 88% of constituents adsorbed were taken off using a 70% ethanol aqueous solution.

Key words: ginseng ethanol extracts, lead removal, adsorption, fixed-bed, effective constituent