高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (4): 605.

• 论文 • 上一篇    下一篇

三正辛胺-二甲苯液膜迁移Cd(Ⅱ)的研究

何鼎胜, 马铭, 王艳   

  1. 湖南师范大学化学系, 长沙 410081
  • 收稿日期:1999-04-22 出版日期:2000-04-24 发布日期:2000-04-24
  • 通讯作者: 何鼎胜(1949年出生),男,硕士,副教授,从事液膜研究.E-mail:mming@public.cs.hn.cn E-mail:mming@public.cs.hn.cn
  • 基金资助:

    湖南省科学技术委员会应用课题基金(批准号:01-952-54)

Studies on Transport of Cadmium(Ⅱ) Ions Through a Tri-n-octylamine xylene Liquid Membrane

HE Ding-Sheng, MA Ming, WANG Yan   

  1. Department of Chemistry, Hunan Normal University, Changsha 410081, China
  • Received:1999-04-22 Online:2000-04-24 Published:2000-04-24

摘要: 研究了三正辛胺-二甲苯支撑液膜体系中搅拌速率、反萃剂、三正辛胺浓度、料液中H+浓度等因素对Cd(Ⅱ)离子迁移的影响.用大块液膜测定了不同温度时Cd(Ⅱ)离子跨膜迁移的萃取及反萃取的表观速率常数k1和k2.实验表明,温度升高,k1和k2均增大(k1>k2),且达到膜相最大镉离子浓度时所需的时间逐渐减少.膜相积累的镉离子浓度达最大时,Cd(Ⅱ)离子跨膜传输为稳态传输.根据Arrhenious关系得到膜相萃取反应和反萃取反应的活化能分别为23.8和19.3kJ/mol.

关键词: 大块液膜, 镉离子Cd(Ⅱ), 三正辛胺, 反应速率常数

Abstract: The effects of stirring rate, stripping agent, tri-n-octylamine concentration, initial concentrations of H+ions in the feed phase on transport flux of Cd(Ⅱ) ions across a tri-n-octylamine xylene supported liquid membrane were studied. The pseudo-first-order rate constants, k1 and k2, of the interfacial reactions on the feed and the stripping side membrane face were determined in bulk liquid membrane. The experimental results show that k1 and k2 increase with an increase of temperature and k1> k2. The tmax decreases with a corresponding raising of temperature. The transport of Cd(Ⅱ) across membrane is in steady state when the concentration of Cd(Ⅱ) in membrane is maximum value. The apparent activation energies were found to be 23.8 kJ/mol for extraction and 19.3 kJ/mol for stripping extraction in the liquid membrane system according to Arrhenius equation, respectively.

Key words: Bulk liquid membrane, Cadmium ions, Tri-n-octylamine, Reaction rate constant

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