CRCU

Chemical Research in Chinese Universities ›› 2011, Vol. 27 ›› Issue (1): 132-139.

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Tb(III) Transport in Dispersion Supported Liquid Membrane System with D2EHPA as Carrier in Kerosene

PEI Liang1,2*, YAO Bing-hua1, WANG Li-ming1 and MA Zhan-ying1   

  1. 1. Faculty of Water Resources and Hydraulic Power, Xi’an University of Technology, Xi’an 710048, P. R. China;
    2. Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resource Research, Chinese Academy of Sciences, Beijing 100101, P. R. China
  • Received:2010-01-15 Revised:2010-03-24 Online:2011-01-25 Published:2011-01-04
  • Contact: PEI Liang E-mail:pellys_0311@163.com
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.90401009), the Natural Science Foundation of Shaanxi Province, China(No.SJ08B16), the Science Research Program of Education Department of Shaanxi Province, China (No.06JK215) and the Research Fund for Excellent Doctoral Thesis of Xi'an University of Technology, China (No.602-210805).

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Abstract: The transport of Tb(III) in dispersion supported liquid membrane(DSLM) with polyvinylidene fluoride membrane(PVDF) as the support and dispersion solution including HCl solution as the stripping solution and di(2-ethylhexyl) phosphoric acid(D2EHPA) dissolved in kerosene as the membrane solution, has been studied. The effects of pH value, initial concentration of Tb(III) and different ionic strength in the feed phase, volume ratio of membrane solution to stripping solution, concentration of HCl solution, concentration of carrier, different stripping agents in the dispersion phase on the transport of Tb(III) have also been investigated, respectively. As a result, the optimum transport conditions of Tb(III) were obtained, i.e., the concentration of HCl solution was 4.0 mol/L, the concentration of D2EHPA was 0.16 mol/L, the volume ratio of membrane solution to stripping solution was 30:30 in the dispersion phase and pH value was 4.5 in the feed phase. Ionic strength had no obvious effect on the transport of Tb(III). Under the optimum conditions, the transport percentage of Tb(III) was up to 96.1% in a transport time of  35 min when the initial concentration of Tb(III) was 1.0×10–4 mol/L. The diffusion coefficient of Tb(III) in the membrane and the thickness of diffusion layer between feed phase and membrane phase were obtained and the values were 1.82×10–8 m2/s and 5.61 μm, respectively. The calculated results were in good agreement with the literature  data.

Key words: Dispersion supported liquid membrane, Di(2-ethylhexyl) phosphoric acid, Terbium(III), Dispersion phase, Transport flux, Transport percentage