Chem. J. Chinese Universities ›› 2016, Vol. 37 ›› Issue (9): 1716.doi: 10.7503/cjcu20160037

• Physical Chemistry • Previous Articles     Next Articles

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)

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

CLC Number: 

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