高等学校化学学报 ›› 2016, Vol. 37 ›› Issue (9): 1716.doi: 10.7503/cjcu20160037

• 物理化学 • 上一篇    下一篇

TODGA/HNO3萃取La3+的界面性质

韦兵, 崔玉, 马守涛, 杨全宁, 孙国新()   

  1. 济南大学化学化工学院, 济南 250022
  • 收稿日期:2016-01-15 出版日期:2016-09-10 发布日期:2016-08-17
  • 作者简介:联系人简介: 孙国新, 男, 博士, 教授, 博士生导师, 主要从事萃取剂的合成及无机新材料的制备及纯化方面的研究. E-mail:chm_sungx@ujn.edu.cn
  • 基金资助:
    国家自然科学基金(批准号: 21077044, 21171069)和山东省自然科学基金(批准号: ZR2015BM030)资助

Extraction Interfacial Properties of La3+ from HNO3 System with TODGA

WEI Bing, CUI Yu, MA Shoutao, YANG Quanning, SUN Guoxin*()   

  1. School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
  • Received:2016-01-15 Online:2016-09-10 Published:2016-08-17
  • Contact: SUN Guoxin E-mail:chm_sungx@ujn.edu.cn
  • Supported by:
    † Supported by the National Natrual Science Foundation of China(Nos.21077044, 21171069)

摘要:

利用滴体积法研究了La3+/HNO3/N,N,N',N'-四辛基-3-氧戊二酰胺(TODGA)/稀释剂体系的界面性质, 考察了TODGA浓度、 液滴形成时间、 稀释剂种类、 La3+浓度、 体系温度、 离子强度和溶液酸度等因素对体系界面性质的影响. 实验结果表明, 体系达到界面饱和吸附时间约为120 s, 可认为体系达到萃取平衡; TODGA浓度不同时, 界面张力也不同, 进而判定界面饱和吸附物种亦不相同; 极性较小的稀释剂体系的界面张力降低较大, 按照正辛烷>环己烷>苯>甲苯次序降低; HNO3对TODGA的质子化作用使其表面活性显著增强, 故硝酸浓度增大导致界面张力降低; NaNO3的存在降低了界面上游离萃取剂分子的浓度, 致使界面张力增大.

关键词: TODGA, La3+, 滴体积法, 界面性质, 萃取

Abstract:

The interfacial properties of La3+/HNO3/N,N,N',N'-tetraoctyl diglycolamide(TODGA)/dilute system were studied by the drop volume method, including the effect of TODGA concentration, equilibrium time, types of diluents, La3+ concentration system temperature, ionic strength and acidity on the interfacial properties. It was found that: (1) the interfacial saturated adsorption time is about 120 s in this system; (2) the interfacial tension are different with the different TODGA concentrations, so the interfacial saturated adsorption species may exist differences; (3) the decrease of the interfacial tension is bigger in small polarity dilute system, such as octane>cyclohexane>benzene>toluene; (4) because of the protonation effect for TODGA, the interfacial activity enhanced with the increasing of HNO3 concentration, and reduced the interfacial tension; the presence of NaNO3 reduced the concentration of free TODGA molecules at the interface, and let the interface tension increased.

Key words: N,N,N'-N'-tetraoctyl diglycolamide(TODGA), La3+, Drop volume method, Interfacial property, Extraction

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